JP2683907B2 - Molding direction of parn for twisting machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a textile machine such as a pan winder and a rewinder, and when the pan is unwound from the upper taper part side by a twisting machine such as a tarble twister in the next step, a winding deviation occurs. The present invention relates to a method for forming a pawn for a twisting machine, which can minimize unwinding troubles such as yarn misalignment.

When forming a conical bun on a straight bobbin (hereinafter simply referred to as bobbin) with spun yarn with a lot of fluff in a conventional technique such as a pan winder, as a winding method to prevent unwinding trouble due to the fluff in the next step. The filling volume is excellent.

Filling winding is a type of winding in which the traverse amount along the longitudinal direction of the bobbin is made shorter than the entire length of the bun, winding is started from either the upper or lower side of the bobbin, and the traverse position moves to the other side with the passage of time. However, the shape of the obtained awn is a so-called conical awn having a tapered portion in the upper part and the lower part. This pan is installed so that the taper part formed at the end of winding becomes the upper part, and when unwinding upward, it can be unwound in order from the upper tapered surface, and the unwound yarn hangs on the fluff. And a smooth unwinding property can be obtained.

A PAN molding device for realizing a filling winding is a yarn guide for PAN molding, in which two brackets are screwed together at an appropriate interval with respect to one screw shaft, and a pair of sensors attached to each bracket. The turning point positions at the upper and lower ends of are regulated. That is, both sensors
By rotationally driving the screw shaft at a constant speed, it is possible to move on the screw shaft while keeping the mutual interval constant, and to move the traverse position while keeping the traverse amount constant.

Problems to be Solved by the Invention In such a conventional filling wrap, since the traverse amount is kept constant from the beginning to the end of the winding, the forming feed speed (the moving speed of the traverse position, the same applies hereinafter). In some cases, it was difficult to set the optimum winding condition. That is, if the traverse amount is too large, the length of the parallel yarn layer formed in parallel with the bobbin at the lower part of the awn becomes long, and the unwinding resistance may become too large when unwinding from that portion. is there. Therefore, if the traverse amount is reduced, this problem can be solved, but the winding amount of the pan is insufficient. When the winding amount is insufficient, it is effective to reduce the forming feed speed and increase the taper angles of the upper and lower taper portions, but at that time, the inclination of the yarn layer forming the upper taper portion becomes large, There arises a problem that winding deviation at that portion and yarn deviation due to the unwinding yarn are likely to occur.

Here, the main cause of the unwinding resistance from the parallel yarn layer is that the entanglement due to the fluff occurs between the adjacent yarns, and the cause of the yarn deviation in the upper taper portion is also the same. The main cause of the winding deviation is that the winding tension of the yarn suddenly fluctuates between the large diameter portion and the small diameter portion of the winding diameter during molding of the pirn, and the large diameter portion of the steeply tapered portion is large. If the yarn tension at is larger than that at the small diameter portion, winding deviation easily occurs.

Therefore, in view of the problem of the prior art, an object of the present invention is to increase the traverse amount of the filling winding only during a predetermined period from the beginning of winding, thereby shortening the length of the parallel yarn layer in the lower part of the pan. At the same time, the taper angle in the upper taper section is made small so that the winding amount does not become insufficient, and even with spun yarn with a lot of fluff, the problem of unwinding resistance in the lower part of the pan, winding deviation and thread deviation in the upper taper section It is an object of the present invention to provide a method for forming a parn for a twisting machine, which can solve the above problems at once.

Means for Solving the Problems The constitution of the present invention for achieving the above object is to continuously traverse the filling winding only during a predetermined period from the beginning of winding when forming a conical PAN on a straight bobbin. It is the gist to increase to.

In addition, the increasing speed of the traverse amount in the predetermined period is
It may be constant or may be continuously increased or decreased.

Action According to the configuration of the invention, since the traverse amount is small at the winding start portion of the awn, the length of the parallel yarn layer formed in parallel with the bobbin at the lower portion of the awn can be sufficiently shortened. There is no fear that the unwinding resistance at will become excessive. On the other hand, since the traverse amount is large at the winding end portion, the taper angle of the upper tapered portion of the pan can be made sufficiently small, and winding deviation or yarn deviation in the upper tapered portion can be prevented. By increasing the traverse amount only during the predetermined period from the beginning of winding, the taper angle of the upper tapered portion does not become too small, and the decrease in the total winding amount can be suppressed to the minimum.

However, the predetermined period here means a predetermined period on the winding start side, which is shorter than the entire period, out of the entire period from the beginning of winding to the end of winding. The forming feed speed may be appropriately set so that the taper angle of the lower taper portion has an appropriate value and a predetermined winding amount can be secured.

If the rate of increase in traverse amount is constant, the setting calculation of the total winding amount is extremely easy. This is because the winding shape during the predetermined period is determined by the minimum and maximum values of the traverse amount and the movement amount of one sensor that regulates the lower end turning point.

By continuously increasing or decreasing the traverse amount increasing speed, the winding amount can be increased as compared with the case where the increasing speed is constant.

Comparative Example Hereinafter, a comparative example, which is a premise of the present invention, will be described with reference to the drawings.

The molding device K of the peen has a first sensor 12 driven by rotation of the screw shaft 11, a second sensor 22 driven by rotation of the screw shaft 21, and an operating piece 31 as main members (first (Fig. 1).

The screw shaft 11 is connected to a motor 14 via a reduction gear mechanism 13. A bracket 12a is screwed onto the screw shaft 11, and the first sensor 12 is mounted on the bracket 12a. A fixed shaft 11a is arranged in parallel with the screw shaft 11, and the fixed shaft 11a serves as a rotation stopper for the bracket 12a by slidably penetrating the bracket 12a.

The screw shaft 21 is arranged in parallel with the screw shaft 11, and is connected to the motor 24 via a reduction gear mechanism 23. Screw shaft
Similarly to the screw shaft 11, a bracket 22a to which the second sensor 22 is attached is screwed to the screw shaft 21, and the fixed shaft 21a is arranged in parallel.

The operating piece 31 is one rod 32a of a double shaft type cylinder 32.
It is fixed at the tip of. When the operating piece 31 moves to the right side in FIG. 1 and is in the position of the first sensor 12, it can operate the first sensor 12, and moves to the left side in FIG. The second sensor 22 can be activated when in the position. However, the first and second sensors 12,
22 is, for example, a magnetically sensitive proximity sensor, and an operating piece 31
Is a block body made of a magnetic material suitable for the first and second sensors 12 and 22.

A traverse device T is connected to the tip of the other rod 32b of the cylinder 32. The cylinder 32 is provided with a yarn guide YG for forming the pan P through the traverse device T.
1 can be traversed vertically along the bobbin B. That is, one end of the traverse belts Tb, Tb bent in the vertical direction is connected to the connecting member Ta extending to the tip of the rod 32b via the guide pulleys Tc, Tc,
The other ends of the traverse belts Tb, Tb are connected to the upper member Te1 and the lower member Te2 of the traverse device T, respectively. The yarn guide YG1 is provided at one end of the upper member Te1 so as to project.
Confronts Bobbin B. The traverse device T has legs Tf,
The Tf is slidably inserted into the fixed bushes Td, Td, so that it is vertically movable as a whole.

The bobbin B is vertically inserted through the spindle SP. The spindle tape SP1 is brought into contact with the spindle SP, and the spindle SP can rotate at high speed by the traveling of the spindle tape SP1. Further, another yarn guide YG2 is arranged above the axis of the bobbin B, and the yarn y unwound from the yarn feeder (not shown) is
The yarn P is supplied to the bobbin B via the yarn guides YG2 and YG1 to form a pawn P on the bobbin B.

When pressure oil is supplied to the cylinder 32 from a hydraulic source (not shown) and the rods 32a and 32b are horizontally reciprocally driven, the traverse device T is connected to the connecting member Ta and the traverse belts Tb and Tb.
Driven vertically through the yarn guide at this time
YG1 can traverse up and down along bobbin B. On the other hand, since the operating piece 31 is fixed to the rod 32a of the cylinder 32, the operating piece 31 reciprocates left and right in conjunction with the traverse movement of the yarn guide YG1, and the first and second sensors 1
2 and 22 can be operated alternately.

Therefore, the hydraulic circuit of the cylinder 32 is switched every time the first and second sensors 12, 22 are operated, and the driving direction thereof can be reversed. That is, the first sensor 12
Corresponds to the lower end turning point of the traverse motion of the yarn guide YG1, the second sensor 22 corresponds to the upper end turning point thereof, and the first and second sensors 12 and 22 form a pair. The traverse amount of the guide YG1 can be regulated.

On the other hand, the first and second sensors 12 and 22 rotate the screw shafts 11 and 21 through the motors 14 and 24 and the reduction gear mechanisms 13 and 23, respectively, so that the axial directions of the screw shafts 11 and 21 are reduced. Move straight to. However, the reduction gear mechanisms 13 and 23 have different reduction ratios, and the speed of the second sensor 22 is the same as that of the first sensor.
It is assumed that the speed is greater than 12 and the moving directions of both are leftward in FIG. At this time, the traverse position of the yarn guide YG1 is set to the first and second sensors 1
The movement of 2, 22 moves upward along the bobbin B, and the relative distance between the first and second sensors 12, 22 increases linearly, so that the traverse amount of the yarn guide YG1 also increases linearly. Increase. That is, the traverse amount at this time has a constant increasing speed from the beginning of winding to the end of winding.

Now, the traverse amount T1 at the beginning of winding of the yarn guide YG1 along the bobbin B and the traverse amount T2> T1 at the end of winding (Fig. 2) are set, and the movement amount A of the first sensor 12 from the beginning to the end of winding A > T1, the upper taper part on the bobbin B
The taper angle of P1 is θ1, the taper angle of the lower taper part P2 is θ2> θ
1 and the vertical length of the upper taper portion P1 is equal to the traverse amount T2 at the end of winding, and the conical awn P of the filling winding can be obtained. However, in the figure, straight lines S1 and S2
Indicates the moving distances of the first and second sensors 12 and 22 with respect to time, and the slopes V1 and V2 thereof indicate the moving speeds of the first and second sensors 12 and 22 (however, V2 ＞ V
1).

The pan P molded in this manner has a large traverse amount T2 at the end of the winding, so that the upper tapered portion
By reducing the taper angle θ1 of P1, it is possible to prevent winding deviation and yarn deviation in the upper tapered portion P1. Furthermore, when unwinding the formed pawn P, even when unwinding from the inner layer portion of the lower taper portion P2 in the final stage of unwinding, the maximum length of the parallel yarn layer parallel to the bobbin B is at the beginning of winding. It is equal to the traverse amount T1, and the unwinding resistance can be suppressed to a small value by reducing it. Moreover, since the length of the upper taper portion P1 can be increased, the pan P
Since the position of the ridge line portion B becomes low, there is no risk that the untwisted yarn will come into contact with the ridge line portion B even when a balloon is formed around the pan P like unwinding by a double twister.

The motor 14 and the reduction gear mechanism 13 may be common to the screw shafts 11 and 21 (Fig. 3). However, the reduction gear mechanism 13 is assumed to have different reduction ratios from the motor 14 to the screw shafts 11 and 21. The reduction gear mechanism 13 can be integrated as a two-output shaft type and can be driven by a common motor 14, so that the overall configuration can be further simplified.

Also, for one screw shaft 11, brackets 12a, 22a
May be screwed to increase the movement amount of the second sensor 22 via the swing lever 25 (FIG. 4). The swing lever 25 is swingably supported by a fixed pin 25b which is inserted into a long hole 25a at one end, and the other end is pivotally attached to the bracket 22a via a pin 25c. The second sensor 22 is attached to the tip of the swing lever 25 on the bracket 22a side. The swing lever 25 is movable relative to the fixed pin 25b in the range of the elongated hole 25a, and is swingable around the fixed pin 25b.

If the screw shaft 11 is rotated and the brackets 12a and 22a are driven leftward in FIG. 4, both of them move at a constant speed. At this time,
Since the second sensor 22 is attached to the tip of the swing lever 25, the moving speed of the second sensor 22 is determined by the fixed pin.
25b, the pin 25c, and the swing sensor 25 divided by the second sensor 22 are enlarged according to the ratio of the divided lengths L1 and L2 (FIG. 5). Therefore, the first at the beginning of winding and the end of winding,
The relative distance between the second sensors 12 and 22, that is, the traverse amounts T1 and T2 of the yarn guide YG1 at both time points are T2> T1.
Therefore, the obtained pan P is almost the same as that of the previous example (FIG. 6).

However, the horizontal acceleration of the second sensor 22 becomes maximum when the swing lever 25 takes the upright position (the fifth acceleration).
The movement locus of the second sensor 22 with respect to time is not a straight line S2 but a curved line S21 convex upward (FIG. 6). That is, the increasing speed of the traverse amount of the yarn guide YG1 can be continuously increased or decreased so as to have the maximum value on the way from the winding start to the winding end.

Incidentally, the swing lever 25 can be provided with a plurality of pin holes 25d, 25d ... For inserting the pin 25c in the longitudinal direction (FIG. 4). The swing lever 25 can change its division lengths L1 and L2 by changing the pivot position of the pin 25c, and adjusts the relative movement speed of the second sensor 22 with respect to the first sensor 12. It is possible. Further, in order to change the mounting position of the fixing pin 25b up, down, left and right, a plurality of pin holes 25e, 25e ... Are provided to adjust the division lengths L1 and L2, and at the same time, the upright position of the swing lever 25, that is, the second position. It is also possible to adjust the maximum acceleration position of the sensor 22.

In FIG. 4, it suffices that the bracket 22a pivotally attaching the swing lever 25 via the pin 25c moves at the same speed with respect to the bracket 12a with an appropriate interval. Therefore, the bracket 22a is a simple mounting plate attached to the bracket 12a.
It can be changed to 15 (Fig. 7). However, the mounting plate
15 is arranged parallel to the screw shaft 11, and by forming the elongated hole 15a, the traverse amount T1 at the beginning of winding can be adjusted. Further, the first sensor 12 may be attached to the bracket 22a side via the attaching member 16 having the elongated hole 16a (FIG. 8).

The rocking lever 25 is pivotally attached to the bracket 12a via a pin 25c (FIG. 9), and the first sensor 12 is mounted on the rocking lever 25 between the fixed pin 25b and the pin 25c, and the second The sensor 22 can be attached to the bracket 22a. Since the moving speed of the first sensor 12 can be made smaller than the moving speed of the second sensor 22 by the swing lever 25, the moving speeds of the both realize the same relative relationship as in the above-described respective examples. be able to.

In each of these examples, the rocking lever 25 is relatively movable with respect to the fixed pin 25b within the range of the long hole 25a, but conversely, the long hole 25a is moved to the brackets 12a, 22 of the rocking lever 25.
It may be provided on the a side and movable relative to the pin 25c.

Example The period in which the traverse amount of the filling winding is increased can be limited to the period from the winding start to the switching point of the predetermined period t, instead of the entire period from the winding start to the winding end ( (Fig. 10). A certain amount of traverse after the switching point
Since it is possible to realize a normal filling winding with a small taper angle θ1 by setting T2, it is possible to reduce the yarn breakage and the yarn deviation, and it is possible to correct the tendency that the entire winding amount of the pan P decreases.

The pan P in FIG. 10 is, for example, a constant value of the moving speed of the first sensor 12 corresponding to the bottom turning point of the traverse movement.
On the other hand, V2 is set by setting the moving speed of the second sensor 22 corresponding to the upper end turning point to a constant value V2> V1 from the winding start time to the switching point and changing to a constant value V1 after the switching point. be able to. The second sensor 22 moves along the straight line S2 during a predetermined period t up to the switching point, and after the switching point,
This is because the first sensor 12 moves along a straight line S3 that is parallel to the straight line S1 that indicates the movement of the first sensor 12. The length of the predetermined period t may be set arbitrarily, but according to the experiment, the first time at the switching point is determined.
It is preferable that the movement amount L1 of the sensor 12 is set to be in a range from about half of the traverse amount T1 at the beginning of winding to the vicinity of the traverse amount T1.

The pan P shown in FIG. 10 can be formed by the pan forming apparatus K shown in FIG. That is, the second sensor 22
The motor 24 connected to the screw shaft 21 for moving the motor is changed to a variable speed motor, and at the switching point, the second sensor 22
The moving speed V2 of the first sensor 12 may be switched to be equal to the moving speed V1 of the first sensor 12. Further, it goes without saying that the reduction gear ratio of the reduction gear mechanism 23 may be switched.

Further, the swing lever 25 in FIG. 4 is designed so that the swing angle θ uniformly increases from the start of winding to the switching point, and after the switching point, the swing angle θ remains constant and moves in parallel. Good (Fig. 11). However, the bracket 22a to which the second sensor 22 is attached is provided with restricting pins 22c and 22d, and the fixing pin 25b that supports the swing lever 25 is the screw shaft 1
It is movable along a long hole 26a of the guide member 26 which is parallel to 1. Further, the protruding position of one of the restriction pins 22c can be adjusted by the elongated hole 22b.

The swing lever 25 (solid line in the figure) which is in a predetermined posture at the start of winding is inclined in a direction in which the swing angle θ increases by driving the screw shaft 11 (see the figure 2). When the regulating pin 22c comes into contact with the swing lever 25 (dotted line), thereafter, the swing angle θ is regulated by the regulating pin 22c and the pin 25c to a constant value, and the swing lever 25 moves in parallel. That is, the restriction pin 22c can provide the switching point shown in FIG. The second sensor 22 at this time is
It moves according to the curve S21 and the straight line S3 in FIG. Further, the other regulating pin 22d reverses the screw shaft 11 and causes the swing lever 25 to rotate.
It is necessary when returning to the posture at the beginning of winding.

Note that the swing lever 25 of FIGS. 7 to 9 is also changed in accordance with the change of the swing lever 25 of FIG. 4 to that of FIG.
It can be changed as well. However, in each of these embodiments, the posture of the swing lever 25 at the beginning of winding is not limited to the upright posture shown in FIG. 11, and may be any predetermined inclination angle.

EFFECTS OF THE INVENTION As described above, according to the present invention, the traverse amount of the filling winding is continuously increased only during a predetermined period from the start of winding, so that the traverse amount of the filling winding is parallel to the bobbin formed in the lower portion of the awn. Since the length of the parallel yarn layer can be made sufficiently short corresponding to the small traverse amount at the beginning of winding, even if it is a spun yarn having a lot of fluff, the unwinding resistance does not become excessive, Further, the taper angle of the upper taper portion can be made sufficiently small corresponding to the large traverse amount at the end of the predetermined period, so that the winding deviation at this portion and the yarn deviation due to the unwinding yarn can be prevented. There is an excellent effect that the winding amount as a whole is not caused.

[Brief description of the drawings]

1 to 9 show a comparative example, FIG. 1 is an explanatory view of the entire structure of a molding device for a pan, FIG. 2 is an explanatory view of the molding condition of a pan, and FIGS. Explanatory diagram, FIG. 5 is an explanatory diagram of operation, FIG. 6 is a diagram corresponding to FIG. 2, and FIGS. 7 to 9 are diagrams corresponding to FIG. 4, respectively. 10 and 11 show an embodiment, FIG. 10 is a view corresponding to FIG. 6, and FIG. 11 is a view corresponding to FIG. P: Pan B: Bobbin T1, T2: Traverse amount t: Predetermined period

Claims (3)

(57) [Claims] 1. A method of forming a pawn for a twisting machine, which comprises continuously increasing the traverse amount of a filling winding only during a predetermined period from the beginning of winding when forming a conical bun on a straight bobbin. 2. The method according to claim 1, wherein the increasing speed of the traverse amount during the predetermined period is constant.
A method for forming a pawn for a twisting machine according to the item. 3. The method for molding a pawn for a twisting machine according to claim 1, wherein the increasing speed of the traverse amount during the predetermined period is continuously increased or decreased.