JPH02221064A - Pirn forming method and device therefor - Google Patents

Abstract

PURPOSE:To obtain sufficient winding quantity and minimize the release resistance of the lower part of a pirn so as to prevent the winding break and yarn break at the upper part by increasing the traverse quantity gradually during pirn formation and making the feed speed of formation first high and then switching it to low. CONSTITUTION:In the winding starting part of a pirn, the traverse quantity is made sufficiently small and the length of a parallel yarn layer formed parallel to a bobbin at the lower part of the pirn is sufficiently short, and thus the release resistance of that part can be minimized. On the other hand, in the winding ending part, the traverse quantity is made large, and the cone angle of an upper tapered part can be made small. Accordingly, winding break and yarn break generated at the upper tapered part can be prevented. The forming feed speed is made first high in order to check the cone angle of a lower tapered part, then switched to low and maintained in that state until the winding end, thus securing the specific winding quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention is a textile machine such as a pirn winder or rewinder, in which winding (misalignment) is prevented when the pirn is unwound from the upper tapered part side using a double twister or the like in the next process. The present invention relates to a pirn forming method and apparatus for minimizing the risk of unwinding troubles including yarn slippage.

When forming a conical pirn using a conventional pirn winder or the like using a spun yarn with a lot of fluff, filling winding is particularly effective as a winding type to prevent unraveling problems due to fluff in the next process. There is.

Filling winding is a winding method in which the amount of traverse along the longitudinal direction of the bobbin is shorter than the total length of the pirn, and the winding starts from either the top or bottom of the bobbin and moves the traverse position to the other side as time passes. The shape of the obtained pirn is a so-called conical pirn having a tapered portion at the upper and lower parts. This paan is
The tapered part formed at the end of winding is installed at the top, and when unwinding upward, the thread is always unwound from the upper tapered surface, so the unwinding thread hangs on the fluff. Therefore, smooth unwinding performance can be obtained.

The most common type of pern forming device for realizing filling winding is one in which two brackets are screwed together at an appropriate interval around a screw shaft, and a pair of sensors attached to each bracket is used. , the turning point positions at both the upper and lower ends of the yarn guide for pirn forming are regulated. When the screw shaft is rotated at a constant speed, both sensors can move on the screw shaft while keeping the distance constant, so the traverse position can be moved while keeping the traverse amount constant. It is something that can be done.

The problem to be solved by the invention is that in the conventional filling winding pirn, the amount of traverse is kept constant from the beginning of winding to the end of winding. (The same applies hereinafter) In relation to the clasp, it may be difficult to set the optimum winding property. In other words, when the amount of traverse is too large, the length of the parallel yarn layer formed parallel to the bobbin at the bottom of the pirn increases, and therefore, when unwinding from that part, the unwinding resistance increases. It's too much. Therefore, when reducing the traverse amount, this problem can be solved, but on the other hand, the amount of winding of the pirn becomes insufficient. It is effective to reduce the forming feed speed and increase the taper angle of the upper and lower tapered parts to prevent insufficient winding, but in this case, since the slope of the yarn layer forming the upper tapered part is large, This was accompanied by problems such as winding misalignment in that part and thread misalignment due to unwinding.

Here, the reason why the unwinding resistance from the parallel yarn layer increases is as follows.
The main cause is tangles caused by fluff between adjacent yarns, and the cause of yarn displacement at the upper tapered portion is also similar. In addition, the main cause of winding misalignment is the difference in the winding width (J) of the steep yarn between the large diameter part and the small diameter part when forming the pirn. When the yarn tension in the large diameter portion is greater than that in the small diameter portion, winding misalignment easily occurs.

Therefore, in view of the problems of the prior art, an object of the present invention is to make the traverse amount during pirn forming extremely small at the beginning of winding, and gradually increase it, and to increase the forming feed rate at the beginning of winding. A new pirn forming method that simultaneously solves problems related to unwinding resistance at the lower part of the pirn and winding (slippage) and thread misalignment at the upper tapered part by switching to high speed and then to low speed without causing insufficient winding amount. An object of the present invention is to provide a method and an apparatus therefor.

As a means for solving the problem, the configuration of the first invention for achieving the object is to continuously increase the traverse amount by 1 over a predetermined period from the beginning of the winding when forming the pirn of the filling winding. The gist is to increase the forming feed rate and to switch the forming feed rate from high to low within this predetermined period.

Further, the configuration of the second invention includes a feeding mechanism and a first feeding mechanism that moves in the same direction while gradually increasing the relative distance.
, comprises a second sensor and a third sensor that detects the passage of a predetermined time from the start of winding, and regulates the traverse movement of the yarn guide in accordance with each position of the first and second sensors. The gist is to switch the feed speed of the feed mechanism using a sensor.

The feed mechanism includes a feed screw shaft, first and second brackets that are screwed onto the feed screw shaft, a restrained end and a free end, and a swing arm that is swingably connected to the second bracket. The first sensor may be attached to the first bracket, and the second sensor may be attached to the free end of the swing arm.

Further, the swing arm may be provided with an angle limiting mechanism that adjustably restricts the swing limit of the swing arm.

According to the configuration of the first invention, the traverse amount is made sufficiently small at the winding start portion of the barn, and the length of the parallel thread layer formed in the lower part of the barn in parallel with the bobbin is reduced. Since it can be made sufficiently short, the unwinding resistance at that part can be made sufficiently small.On the other hand, since the traverse amount is large at the end of the winding, the taper angle of the upper tapered part is set to sufficiently reduce the unwinding resistance at that part. Therefore, it is possible to effectively prevent winding misalignment and yarn slippage in the upper tapered part.At this time, the forming feed speed is adjusted so that the taper angle of the lower tapered part does not become excessive. A predetermined amount of winding can be ensured by setting the winding speed sufficiently high at the beginning, then switching to a low speed and maintaining it until the end of winding.

Further, according to the configuration of the second invention, the first and second sensors driven by the feeding mechanism each detect the lower end turning point of the traverse movement of the yarn guide (the switching point from the downward stroke to the upward stroke of the traverse movement). It can be used to detect the upper end turning point (the switching point from the upward stroke of the traverse movement to the downward stroke; the same applies hereinafter), and at this time, the traverse amount of the yarn guide is , increases according to the relative distance between the first and second sensors, and the traverse position thereof increases depending on the relative distance between the first and second sensors.
The forming feed speed can be changed by moving with the movement of the second sensor, and by switching the feed speed of the feed mechanism at a predetermined time using the third sensor. can be implemented.

In addition, according to the feed mechanism whose main body is the feed screw shaft, the first
, the second bracket moves in the axial direction of the feed screw shaft while maintaining a predetermined relative distance by rotationally driving the feed screw shaft. On the other hand, a swinging arm is swingably connected to the second bracket, and the free end of this swinging arm moves so as to expand the movement of the second bracket around the restrained end. Therefore, the relative distance between the first sensor on the first bracket and the second sensor attached to the free end of the swing arm increases over time, making it possible to increase the amount of traverse.

Additionally, if an angle limiting mechanism is attached to the swinging arm, the traverse amount will increase continuously until the swinging angle of the swinging arm is limited by the angle limiting mechanism, but after that it will remain constant. can be kept.

It works as described above.

Example Examples will be described below with reference to the drawings.

Byrne's molding device includes a feed mechanism 10 having a feed screw shaft 11, a first sensor 21, a second sensor 22, and a third sensor.
The sensor 23 is the main component (Fig. 1).

The feed screw shaft 11 is connected to a coupling lla and a reduction gear 1.
It is connected to the motor 13 via 2a and 12b. Further, first and second brackets 14 and 15 are screwed onto the feed screw shaft 11 at an appropriate relative distance.
Further, a stopper Ilb is fixed to the tip of the feed screw shaft 11.

The first sensor 21 is attached to the first bracket 14. Further, a third sensor 2 is attached to the first bracket 14.
A dog 14a for activating the switch 3 is provided in a protruding manner.

A swing arm 16 is swingably connected to the second bracket 15 . That is, the swing arm 16 is pivotally supported on the second bracket 15 via a pin 15a, and its lower end is a free end. The portion is a restrained end whose movement is restrained by the fixed guide 17.

The fixed guide 17 is arranged parallel to the feed screw shaft 11,
It is a plate material having a long hole 17a, and the swinging arm 16 and the fixed guide 17 have a long hole 16b in the former and a long hole 17a in the latter.
They are connected via a connecting pin 17b that is commonly pushed through. However, the swing arm 16 is rotatable around the connecting pin 17b, and the connecting pin 17b is freely movable within the elongated hole 16b117a.

The second bracket 15 is provided with pins 15b and 15c erected to restrict the swinging limit of the swinging arm 16. however,
The pin 15b is positioned so that the swing arm 16 assumes a substantially upright position, and the pin 15c is movable and adjustable within the elongated hole 15d.

The third sensor 23 is fixed in an operable position via the bracket 18 by the dog 1.4a of the first bracket 14.

The motor 13 is driven via a control circuit CT. It is assumed that the control circuit CT includes timers Tl, 'I'2, and T3, and the timers T2 and T3 are selected by the output of the third sensor 23. However, the timer T1 determines the energization time of the motor 13, and the timers T2 and T3 determine the de-energization time. Therefore, the motor 13
Different average rotational speeds can be achieved by combining the timers 1'l and T2 or the timers Tl and T3.

An actuating piece 31 that is moved by a cylinder 32 is disposed between the first and second sensors 21,22. The cylinder 32 serves as a driving source for the traverse device TV, and the operating piece 31 is fixed to the tip of one rod 32a of the cylinder 32. However, when the actuating piece 31 moves to the right in the figure and is at the position of the first sensor 21, the first sensor 2
1 can be activated, and when it is moved to the left side in the figure and is at the position of the second sensor 22, it can be activated. Here, the first and second sensors 21 and 22 are, for example, magnetically responsive proximity sensors, and the actuating piece 31 is a block body made of a magnetic material suitable for this.

A traverse device TV is connected to the tip of the other rod 32b of the cylinder 32, and the cylinder 32 realizes vertical traverse motion with respect to the yarn guide YGI for forming the pirn P via the traverse device TV. do. That is, the connecting member T extending from the tip of the rod 32b
One end of each of the traverse belts Tb and Tb bent in the vertical direction is connected to the guide pulleys Tc and Tc, and the other ends of the traverse belts Tb and 'T''b are respectively connected to the traverse device TV. The yarn guide YG1 is connected to the upper member Tel and the lower member Te2.
is provided protrudingly from the side end surface of the upper member 1'e1, and faces the bobbin B. The traverse device TV is vertically movable by slidably inserting the legs Tf, Tf into fixed bushes 'T"d, Td.

The bobbin B is held vertically by a spindle SP. It is assumed that a spindle tape SPI is in contact with the spindle SP, and that the former can be driven to rotate at high speed by the running of the latter. Further, another yarn guide YG2 is arranged above the axis of the bobbin B, and the yarn y unwound from the yarn supplying body (not shown) is supplied to the bobbin B via the yarn guides YG2 and YGI. Thus, a pirn P can be formed on the bobbin B.

Now, when pressure oil is supplied to the cylinder 32 from a hydraulic source (not shown) to reciprocate the rods 32a and 32b in the horizontal direction, the traverse device 1'V connects the connecting member Ta and the traverse belts Tb and 'I'. Since the yarn guide Y is driven in the vertical direction via the
Gl can make a traverse movement up and down along the bobbin B.

On the other hand, the actuating piece 31 is reciprocated by the cylinder 32 in conjunction with the traverse movement of the yarn guide YGI, and the first
, the second sensors 21, 22 are activated alternately.

Therefore, when the first and second sensors 21 and 22 operate, the hydraulic circuit of the cylinder 32 is switched, and the cylinder 3
If the driving direction of the yarn guide YGI is reversed, the first sensor 21 corresponds to the lower end turning point of the traverse movement of the yarn guide YGI, and the second sensor 22 corresponds to the upper end turning point. The first and second sensors 21, 22 can work as a pair to regulate the amount of traverse of the yarn guide YGI.

On the other hand, when the feed screw shaft 11 is rotationally driven by the motor 13, the first and second brackets 14.15 are assumed to move to the left in FIG. 1 along the feed screw shaft 11. , the second sensors 21 and 22 also follow this, so
The traverse position of the yarn guide YGI, which is regulated by the above-mentioned lower end turning point and upper end turning point, moves upward along the bobbin B. At this time, the first
Assuming that the second brackets 14 and 15 are in the position shown by the solid line in FIG. , the lower free end becomes tilted to the left. Since the second sensor 22 is attached to the free end of the tilting swing arm 16 in this way, the relative distance between the first and second sensors 21 and 22 and the traverse amount of the yarn guide YGI determined thereby increases continuously from the beginning of winding.

When the swinging arm 16 tilts and contacts the pin 15c, the swinging arm 16 is no longer allowed to tilt further, so from now on, the swinging angle θ is kept constant and the second bracket 15 is moved. (Double-dashed line in Figure 1)
, Therefore, the amount of subsequent traversal is also maintained constant. That is, the minimum traverse ff1L1 at the beginning of winding and the maximum traverse jlL2 after that are the same as at the beginning of winding,
It is determined by the relative distances di and d2 between the first and second sensors 21, 22 at the time when the swing angle θ of the swing arm 16 becomes maximum.

On the other hand, the feed speed of the first and second sensors 21 and 22 by the motor 13 and the forming feed speed determined thereby are switched by the third sensor 23. That is, if the third sensor 23 is activated when the first sensor 21 has moved by a distance d3 from the start of winding, the timer 'T
By switching '2 and T3, the average rotational speed of the motor 13 can be switched from high speed to low speed. However, the timer T2 is set to have a shorter non-energizing time than the timer T3.

In this way, the pirn P obtained when regulating the traverse movement of the yarn guide YG1 is the upper tapered portion P.
1 is a filling winding whose vertical length is equal to the traverse amount L2 at the end of winding (FIG. 2). In the same figure,
Time to indicates the start of winding, time E1 is when the third sensor 23 is activated, and time t2 is when the swing arm 16 is at the swing angle θ.
When reaching , time L3 indicates the end of the winding. Further, the lower straight lines 311 and 312 represent the movement stroke of the lower end turning point due to the movement of the first sensor 21, and the upper straight line S2
1, S22, and S23 indicate movement strokes of the upper turning point due to movement of the second sensor 22.

A, B, and C in the figure indicate time to, respectively.

The center position of the traverse of yarn guide YGI at t2 and t3 is shown. However, the straight line 32L S22 is
Since this is the result of the movement of the bracket 15 and the resulting swinging of the swinging arm 16, strictly speaking, it is an upwardly convex curve, and the straight lines S12 and S23 correspond to the parallel movement of the swinging arm 16. Therefore, the lines are parallel to each other. Further, the slope VI SV2 of the straight lines Sll and S12 represents the forming feed rate determined by the rotation speed of the motor 13 (V2 < Vl).

In the pirn P formed in this way, by increasing the traverse ff1L2 at the end of winding, the taper angle θ1 of the upper tapered part P1 can be made smaller. Furthermore, when unwinding the formed pirn P, even when unwinding from the innermost layer of the lower tapered part P2 in the final stage of unwinding, the bobbin B The maximum length of the parallel yarn layer parallel to is equal to the traverse ff1Ll at the beginning of winding, and by making this sufficiently small, it is possible to keep the unwinding resistance small.In addition, the forming feed rate at the beginning of winding V
By making 1 sufficiently fast, a short traverse amount L1 can be achieved.
This makes it possible to avoid rapid winding thickening due to the lower tapered portion P2 and to reduce the taper angle θ2 of the lower tapered portion P2.
2, the risk of winding misalignment can be minimized. Further, at time t1, by switching to the low forming feed speed V2, the insufficient winding amount can be effectively compensated for.

According to experiments, Ll:L2'', 1:6, Vl:V
2-2:1 shows good results. Here, time t1 is the third
The bracket 18 corresponds to the activation time of the sensor 23.
Accordingly, the position of the third sensor 23 may be adjusted and determined appropriately. Further, since time t2 is the time when the swing angle θ of the swing arm 16 is limited by the pin 15c, it can be changed by adjusting the position of the pin 15c. That is, the pin 15c forms an angle limiting mechanism that limits the swing angle θ.

At the end of winding the pirn P, by rotating the motor 13 in the reverse direction, the first and second brackets 14, 15 and the swinging arm 16 return to their original winding start positions. At this time, the swinging arm 16 first returns from the inclined position to the upright position due to the movement of the second bracket 15, and then returns to the original position while maintaining the upright position by the pin 15b coming into contact with the swinging arm 16. Return.

In the above explanation, the third sensor 23 only needs to detect the passage of an appropriate time totl from the start of winding.
The dog 14a of the bracket 14 allows the first sensor 21
Instead of detecting the position of the second bracket 15, the position of the second sensor 22 and the amount of rotation of the feed screw shaft 11 may be detected. Furthermore, it may be a timer that operates after a predetermined period of time has elapsed since the start of winding.

In addition, the forming feed speed ■1 and V2 can be selected by changing the rotation speed of the motor 13 using timers T1 and T2.
, T3, any other arbitrary method may be used. For example, the reduction ratio of the reduction gear 12a112b may be mechanically switched, or the motor 13 may be a stepping motor and the pulse rate of its drive source may be changed.

As described in detail, according to the present invention, when forming a pirn of a filling winding, the amount of traverse at the beginning of winding is made small, the forming feed speed is made high, and then the traverse is continued for a predetermined period of time. The length of the parallel thread layer formed in the innermost layer of the pirn is made sufficiently small by continuously increasing the amount and switching the forming feed speed to a low speed within this predetermined time,
Moreover, since thickening of the winding in that area can be avoided, the unwinding resistance at the lower part of the pirn is sufficiently small, and the risk of thread breakage at the lower tapered part can be effectively eliminated. By appropriately determining the maximum traverse amount and setting a large maximum traverse amount, there is an excellent effect that there is no shortage of winding m and that the possibility of unwinding trouble at the upper tapered portion can be minimized.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 show an embodiment, with FIG. 1 being an explanatory diagram of the overall configuration, and FIG. 2 being an explanatory diagram of the operation. P...Pun YGI...Yarn guide LL, L2...Traverse amount Vl, V2...Forming feed rate 10...Feed mechanism 11...Feed screw shaft 14...First bracket 15... Second bracket... 16... Swinging arm 21... First sensor 22... Second sensor 23... Third sensor

Claims (1)

[Claims] 1) When forming the pirn of the filling winding, the traverse amount is continuously increased over a predetermined period from the start of winding, and the forming feed speed is changed from high to low within the predetermined period. A method of forming paan characterized by switching to. 2) A feeding mechanism, first and second sensors that move in the same direction while gradually increasing the relative distance by the feeding mechanism, and a third sensor that detects the passage of a predetermined time from the start of winding, 1. A pirn forming apparatus characterized in that the traverse movement of the yarn guide is regulated in accordance with each position of the second sensor, and the feed speed of the feed mechanism is switched by the third sensor. 3) The feed mechanism has a feed screw shaft, first and second brackets that are screwed to the feed screw shaft, a restrained end and a free end, and a rocker that is swingably connected to the second bracket. A swing arm according to claim 2, wherein the first sensor is attached to the first bracket, and the second sensor is attached to the free end of the swing arm. Molding equipment. 4) The pirn forming apparatus according to claim 3, wherein the swinging arm is provided with an angle limiting mechanism that adjustably limits the swinging limit of the swinging arm.