JPH0781848A - Method to prepare feed bobbin for rewinding process - Google Patents

Abstract

PURPOSE: To improve cop preparation work efficiency by rotating a delivery bobbin in a wound package winding direction prior to driving the delivery bobbin in the reverse direction to the wound package winding direction of the delivery bobbin in the state of negative pressure being applied to a suction nozzle. CONSTITUTION: In a conveying system of a winder 3, a cop 1 and a tube 24 are conveyed by means of caddies 2. The caddy 2 insert-fits a cop 1 or tube 24 to an insert-fitting spindle provided at the center. In preparation stations 9-11, a delivery bobbin is rotated around its longitudinal axis, and a detached yarn end is gripped and sucked into a suction nozzle. In the state of negative pressure being applied to the suction nozzle, prior to driving the delivery bobbin reversely to a wound package winding direction of the delivery bobbin, the delivery bobbin is rotated in the wound package winding direction to positively detach reverse wound yarn entangled with the yarn of a wound package.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preparing a pay-out bobbin for a rewinding process, in which a pay-out bobbin is rotated around its longitudinal axis at a preparation station to remove the removed yarn end. This relates to a type that grips and sucks into the suction nozzle.

[0002]

2. Description of the Related Art Current winding machines have a large rewinding capacity. When a spinning bobbin in the form of a cup with a small amount of yarn is supplied to a winding machine having such a large rewinding capacity due to an increase in the work rate of the ring spinning machine, the unwinding operation is reduced. Will end in no time. Therefore, in order to reliably supply the pay-out bobbin to the winding machine, the pay-out bobbin must be surely prepared.

The preparation device for the pay-off bobbin, which must be prepared so that the yarn end can be grasped at the winding point, is divided into a plurality of successive preparation stations. These preparation stations perform the preparation work of the feeding bobbin in stages, and the time required for the preparation work is determined by the work time at each preparation station.

Such a multistage preparation method is described in DE 39 19 542 A1. In this case, first, the spare thread wound around the lower end of the cup tube is removed from the tube end. Next, the press winding thread wound at a rapid pitch over the entire winding package is removed. At the last preparation station the yarn end is sucked into the suction nozzle, the presence of the yarn end is checked by the sensor, the excess yarn portion is cut, then the yarn end segment is wound loosely around the upper end of the tube. To be This yarn end section can be easily grasped again at the winding point. In the trailing yarn cutting device or the preliminary yarn removing device, which is the preparation station immediately before the last preparation station, the unwinding bobbin is set in the winding direction in order to grasp the yarn end and, in some cases, to unwind the yarn end. It can be rotated in the opposite direction. As a result, the yarn end portion may be wound around the delivery bobbin as a so-called reverse winding yarn in a direction opposite to the normal winding direction, even during transportation. This reverse-winding thread often prevents normal thread-clamping from occurring automatically.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to increase the efficiency of cup preparation work.

[0006]

In order to solve this problem, in the structure of the present invention, in the method of the first type described above, the winding package of the delivery bobbin is wound in a state where a negative pressure is applied to the suction nozzle. Before the delivery bobbin is driven in the opposite direction to the take-up direction, the delivery bobbin is rotated in the winding direction of the winding package.

[0007]

When the pay-out bobbin is first rotated in the winding direction of the winding package, this rotation direction is opposite to the winding direction of the reverse winding yarn. As a result, the yarn end located on the winding package of the cup, for example, as the reverse winding yarn can be grasped by the suction flow in the suction nozzle. For this purpose, it is usually sufficient to rotate the cup once so that the suction flow acts on the entire circumference of the cup. In general, the reverse winding yarn is only wound around a part of the entire circumference of the cup, so that the reverse winding yarn can be reliably grasped by rotating the cup once.

However, when a long reverse wound yarn is formed due to special circumstances of the upstream preparation station or the yarn itself, the cup can be rotated more than one revolution in the winding direction. This can be adjusted in the central control unit or in the respective preparation station. The gripping time also differs depending on the position of the yarn end wound around the delivery bobbin as the reverse winding yarn with respect to the suction nozzle. The yarn end that is caught very quickly may in some cases be first sucked in and, after the reverse yarn has been removed, subsequently re-exited from the suction nozzle in a short time by subsequent rotation in the winding direction. However, this yarn end is easily grasped again by the suction nozzle when the rotation direction is changed.

On the other hand, when the gripping time is late,
The grasped yarn end remains sucked into the suction nozzle and is recognized very quickly by the sensor after switching the direction of rotation. As a result, if the yarn end searching time is related to the yarn end recognizing time, which is usually the case now, the preparation time is shortened and the yarn waste is reduced. Above all, even in the presence of reverse winding, the method according to the invention allows the efficiency of the cup preparation operation to be significantly increased without great expense. What is important is that, between the time when the reversely wound yarn disappears and the time when the rotation direction is switched and the yarn is started to be fed, the feeding bobbin does not change its position and the suction air of the same suction nozzle is It is to continue acting on the department. In this case, of course, it is also important that the suction air, which is normally only produced temporarily, has already acted at the beginning of the rotational phase of the pay-out bobbin in the winding direction. As a result, the yarn end located adjacent to the suction nozzle is immediately grasped at the start of rotation.

Claims 2 and 3 describe advantageous embodiments of the invention.

The additional use of mechanical thread disengagement means ensures that the reverse-wound thread, either by itself or intertwined with the thread of the winding package, can be reliably removed.

Since the reverse winding yarns do not always occur, but only occur quite frequently, the means for removing the reverse winding yarns is provided when a plurality of preparation devices are provided in the transport circulation path of the winding machine. It is enough to have it in one preparation device. In this case, since this preparation device has a yarn end gripping function unlike other preparation devices, this preparation device is arranged downstream of the other preparation devices in the transport circulation path.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be specifically described below based on the embodiments shown in the drawings. FIG. 1 schematically shows a part of the transport system of the winding machine 3. In this transfer system, the cup 1 and the tube 24 are transferred by the caddy 2. As is well known, the caddy 2 has a fitting mandrel in the center thereof, and the fitting mandrel has a cup 1 or a tube 24.
Is inserted and transported.

The supply of the cup 1 to the winding machine 3 is carried out via a supply path 4 extending along the winding machine 3. Branch paths 8 and 19 are branched from the supply path 4, and the branch paths 8 and 19 are distributed to the distribution sections 12 and 2.
It leads to the storage section 21 via 0. This storage section 21
Has a conveyor belt which is driven in both directions, which distributes the supplied cup 1 to the lateral conveyor section 22. The lateral transport section 22 has a storage section for the cup 1 and a feeding position. The cup, that is, the tube 24, which has finished feeding the yarn, is guided to the end of the lateral conveying section 22 in each case, delivered to the tube return belt 23, and returned to the starting end of the winding machine 3.

The distribution of the storage section 21 into the drive / transverse section and the stopping in the unwinding position are described in detail in DE 39 19 542 A1, which is described here. Omitted.

Sensors 6 and 13 are arranged at branch points 5 and 15 of the branch paths 8 and 19, and these sensors 6 and 13 cooperate with the tumblers 7 and 14. This allows the cup 1 to be distributed to the branches 8 and 19 and possibly further branches according to a predetermined programming. This distribution is generally performed so that the same number of cups 1 is supplied in each branch path. In this case, the sensors 6 and 13 sense the passage of the cup 1 and, in cooperation with the central control unit 25, ensure that the associated switch is controlled accordingly.

Both branch paths 8 and 19 shown have three preparation stations 9 to 11 and 16 to 18, respectively. Each first preparation station 9 or 16 consists of a preliminary yarn removing device. The second preparation station 10 or 17 is a presser wound yarn removing device, respectively. The preparation stations 11 and 18 arranged on the most downstream side are a thread catching device, a checking device, and a cutting device. The construction of these preparation stations is also based on German Patent Application No. 39 19 54.
Since it is described in the specification No. 2, detailed explanation is omitted.

Each of the thread catching device / checking device / cutting device (11, 18) has a sensor, and this sensor detects that the yarn end has been caught and informs the central control unit 25 of this fact. Let me know. When the yarn end is successfully grasped, if the yarn start end is wound around a predetermined portion of the cup, the yarn end is successfully grasped even at the winding position. Therefore, the distribution section 12 or 20 on the downstream side is adjusted in the conveying direction so as to supply the prepared cup 1 to the storage section 21.
On the other hand, if the end of the thread is not caught, the cup 1 that exits the thread catching device / checking device / cutting device
Is returned to the supply path 4 again by the distribution section 12 or 20. As a result, it is possible to avoid a wasteful operation, and thus a time delay, when a cup that cannot supply the yarn end to the yarn binding device is supplied to the winding position.

The thread gripping device / checking device / cutting device (11 and 18) is a German patent application
It may be constructed exactly as described in the specification of No. 39 25 851. In this case, the drive device for transmitting the rotational movement to the caddy 2 and the cup 1 can also be controlled via the central control unit 25. In the control unit 25, the cup 1 is shown if the controlled part of the winder is highly likely to form a reverse yarn and that the reverse yarn extends over most of the circumference of the cup 1. It is also possible to determine whether or not to rotate more than one revolution in the winding direction. In any case, at the latest at the start of rotation of the cup 1 in the winding direction, negative pressure is applied to the suction slit of the thread catching device / checking device / cutting device (11 or 18) so that the yarn end Must be ready to grab. Also, this negative pressure should not be interrupted when switching the rotating direction of the cup.

Since one preparation device (16-18) still exists on the downstream side of the preparation device comprising the preparation stations 9-11, in the thread catching device / checking device / cutting device (11), It is also possible to omit rotating the cup in the winding direction. That is, when the yarn end portion is not caught by the yarn catching device / checking device / cutting device (11) due to the reverse winding yarn, the unprepared cup 1 is again fed to the supply path 4 via the distribution section 12. , Then branch point 1 of branch route 19
It is supplied to the branch path 19 via 5. Unlike the thread catching device / checking device / cutting device (11), the yarn catching device / checking device / cutting device (18) first rotates the cup at least once in the winding direction in order to remove the reversely wound yarn. As a result, the first preparation device (9
Cups that were not prepared in 11) are automatically and reliably prepared.

If another branch path having a preparation device is provided on the downstream side of the branch path 19, only the yarn catching device / checking device / cutting device of this other branch path will first set the cup. It is sufficient to rotate in the winding direction.

As a mechanical means for dissociating the yarn end,
A contact member having a friction value that is as large as possible, such as a needle comb, a strip to which hard sand is attached, or the like is used.

[Brief description of drawings]

FIG. 1 is a schematic view showing a part of a transport system of a winder.

[Explanation of symbols]

1 cup, 2 caddies, 3 winders, 4
Supply path, 5 branch points, 6 sensors, 7 switcher, 8 branch path, 9-11 preparation station, 12 distribution sections, 13 sensor, 14 switcher, 15 branch points, 16-18 preparation station, 19 Branching route, 20 distribution section, 21 storage section, 22 lateral transport section, 23 tube return belt,
24 tubes, 25 control units

Claims (3)

[Claims] 1. A method of preparing a pay-out bobbin for a rewinding process, which comprises rotating the pay-out bobbin about its longitudinal axis at a preparation station to grab the removed yarn end and place it in a suction nozzle. In the suction type, while the negative pressure is applied to the suction nozzle, the unwinding bobbin is wound in the winding direction before the unwinding bobbin is driven in the direction opposite to the winding package winding direction. A method of preparing a payout bobbin for a rewinding process, characterized by rotating. 2. When a plurality of preparation devices are provided in the transport circulation path of the winding machine, the feeding bobbin is first rotated in the winding direction only at the preparation station located on the most downstream side, and the upstream bobbin is rotated upstream. 2. The method according to claim 1, characterized in that the unwinding bobbin that could not be prepared in the side preparation device is led to the downstream preparation device. 3. A method according to claim 1, characterized in that a mechanical thread disengaging means is additionally used during the rotation of the pay-off bobbin in the winding direction.