EP0711855B1 - Process and device for storing a length of yarn between the bobbin creel and the beam of a beaming machine - Google Patents

Description

The invention relates to a method and an apparatus for Storing an excess length of threads between a creel and the winding tree of a winding machine according to the The preamble of claim 1 or of claim 6 Methods and devices are used, for example, for a slip system the broken and to a standstill Wickelbaums wound thread ends without sagging individual threads between the creel and winding machine again to expose. The threads that are not broken are used in the Turning the winding tree back under a defined thread tension and stored in an ordered field and after the removal of the thread break again before the System continues to run at normal operating speed.

DE-A 41 31 489 is a genre comparable Device has become known in which the thread family fixed on the gate side with the help of two thread clamping rollers before the winding tree reverses and the actual Saving begins. The turning back of the wrapping tree and the adjustment of the storage rollers takes place synchronously, the drive control to keep the constant Thread is pulled over a dancer roller. Other well-known ones Methods and devices work on the same basic principle, the threads always clamped on the gate side will.

A disadvantage of the known methods is that a exact speed synchronization between the memory and the machine is difficult to implement and one requires relatively complex control mechanism. Already minor Speed differences can lead to an overstretching of the Threads until the thread breaks or falls below a minimal thread tension as soon as the dancer roller has reached its end position because the threads are stuck on the gate side are. It is also necessary to clamp the Warp threads open quickly once the stored thread length is rewound, otherwise the gate side Thread clamping used clamping bars or pinch rollers a crushing of the threads and thus to fiber damage to lead.

It is therefore an object of the invention to provide a method of to create the type mentioned above, without expensive Speed regulation a gentle and safe storage of threads. This object is achieved according to the invention solved with a method that the features in claim 1 has.

A synchronization between storage speed and Return speed and therefore a relatively complex Cruise control can be surprisingly simple can be avoided if a small one without exact regulation Differential speed is maintained and if the resulting length difference by thread retraction from the Gate is balanced. All you have to do is thread each Coil gate subjected to a defined braking voltage what is normally necessary anyway in order to do that To keep the thread field taut. When storing the threads must the maximum storable thread length is not accurate to the centimeter be defined. However, it is more important that the threads in the Do not exceed the maximum permissible thread tension. This can be done by pulling threads from the Coil creels can be easily secured, whereby only a negligible reduction in storage capacity in Purchase must be made.

Before the winding tree is turned back, it is in the winding position spreading thread group advantageous by means of of the storage rollers combined on one level, the the thread lengths picked up in the process are retightened by the creel.

Contrary to the previous teaching, it is therefore not necessary Disconnect the creel side first, before at all the storage rollers are placed on the thread sheet. Rather, the merging of the thread field can be done by the Storage rolls themselves.

To deflect the thread field from a central position, can when summarizing the thread group on the common level on the gate side, an insertion roller is moved into the thread sheet be in the middle position in the common plane remains while the storage rollers for loop formation can be adjusted further. Contrary to the usual The thread coulter is now clamped in a middle position only deflected around the feed roller without jamming. The The insertion roller can enter the thread sheet from above or from below be moved. When the middle position is reached a switching device are actuated, which the Rewind of the winding machine triggers. The returned one Thread length is always slightly shorter than the saved one Length. The length compensation is carried out as before Thread retraction from the creel.

The excess length is stored in a particularly simple manner Way when the storage rollers are back in their starting position be moved back while the wrapping tree in the Forward creeper is driven, the creeper speed is greater than the withdrawal rate of the storage rollers and which is made up of the difference between crawl speed and withdrawal speed resulting length difference by thread retraction from the Gate is balanced under the braking voltage. Also at It is always a short partial length from the Gate subtracted so that over the speed difference mentioned always maintain a constant thread tension can be.

Another object of the invention is a device of the type mentioned at the beginning, with which carry out the procedure with simple constructive means leaves. According to the invention, this object is achieved with a device solved with the features of claim 6. The gate side Infeed roller is used to keep the thread group jammed to be inserted into the device in a central position, which the formation of thread loops up and down allowed below. The first thread loop can be used immediately start at the insertion roller.

The insertion roller can be a switching device in the middle position activate to reverse the wrapping tree. Likewise, at least one storage roller in the range of motion upper and lower limit switches can be arranged with which the end of the save process or the save process is detectable.

The traction mechanism gear can have endless adjustment chains, which laterally in the machine frame around upper and lower Chain deflection wheels are tensioned, with one on each side Chain center held an upper or a lower storage roller is.

A particularly advantageous construction of the storage device arises if they have a drive module and at least has a memory module releasably attached to it, the drive device for the traction mechanism transmission in the drive module and the insertion roller are arranged. The The drive module can also have an upper and a lower one Have storage roller, so even with a drive module only a limited thread storage would be possible. Additional memory modules can be connected to the drive module, where each memory module has an upper and one each lower storage roller. The traction mechanism gearbox of the drive modules is connected to the drive module via a coupling or connected to the previous memory module. With the The maximum number of connected memory modules can be Memory length can be determined.

The terms "storage roller" and "insertion roller" used here refer to a preferably cylindrical Body that is rotatably mounted easily and on which the threads can be redirected without damage.

Figur 1

Die Seitenansicht einer Zettelanlage in stark schematisierter Darstellung mit einer Speichervorrichtung zwischen Gatter und Wickelmaschine,

Figur 2

eine Draufsicht auf die Anlage gemäss Figur 1,

Figur 3

die Anlage gemäss Figur 1 beim Vorbereiten des Speichervorgangs und,

Figur 4

die Anlage gemäss Figur 1 beim Speichern der Fäden.

An embodiment of the invention is illustrated in the drawings and will be described in more detail below. Show it:

Figure 1

The side view of a slip system in a highly schematic representation with a storage device between the gate and winding machine,

Figure 2

2 shows a plan view of the installation according to FIG. 1,

Figure 3

the system according to Figure 1 when preparing the storage process and,

Figure 4

the system according to Figure 1 when storing the threads.

Figures 1 and 2 show the slip system in normal operation, in which from a creel 1 warp threads 2 in one vertically radial, almost parallel horizontally Thread field guided by a storage device 3 and from a warping machine 4 via a guide roller 6 onto a warp beam 5 can be wrapped. The threads move in Arrow direction a and the warp beam rotates in the direction of rotation b. The thread sheet 2 is in the winding position shown passed through the memory device 3 without contact.

Each warp thread is controlled by a controllable creel 1 Thread brake 7 provided with a defined braking tension and monitored by a thread monitor 8. In the event of a thread break the thread monitor causes the paper machine to stop 4 and at the same time a defined increased thread braking all thread brakes 7. Depending on where the Thread breakage occurs, but cannot be prevented the broken thread end is already wound on the winding tree 5 becomes. For this reason, the already wound up Chain in the storage device 3 ordered and with a defined Tension is added to the broken end to expose.

The storage device 3 consists of a machine frame 23, in which vertically and oppositely movable upper and lower storage rollers 13 and 13 'are held. Warehousing and movement of these storage rollers takes place via a traction mechanism 12, preferably through endless adjustment chains is formed in the manner of a paternoster elevator. Each Chain loop is around the top and side of the machine frame lower chain deflection wheels 22 and 22 'tensioned and on each The chain center is an upper and a lower storage roller attached. Depending on the direction of rotation of the chain, they move Storage rollers on the adjacent runs towards or away from each other.

On the gate side, an introduction roller 16 is arranged, which on can be attached to side chains in the same way.

The introduction roller is preferably decoupled in Support bearings held on a chain, on which there is also one Storage roller is attached. This insertion roller is moving however, only in a middle position up to a support 17, where it is lifted from the support bearings while the chain moves on. The middle position is about at the level at which the upper and lower storage rollers 13 and 13 'cross. At the edition 17 is a push button 18 provided with the help of the winding machine motor 20 can be controlled.

The insertion roller 16 is together with a pair of storage rollers arranged on a drive module 15, which also the Storage drive motor 11 for driving the traction mechanism wearing. A memory module that can be coupled to the drive module carries another pair of storage rollers. On the memory module 14 is also a lower limit switch 19 and Upper limit switch 21 arranged. On the winding machine 4 is a push button 10 is arranged on which the storage process and the withdrawal process can be started. A Deflection roller 24 causes a common deflection of the thread sheet when saving or withdrawing.

In the illustration according to FIG. 3, the slip machine 4 already stopped over the thread monitor 8 concerned. The Thread brakes 7 are subject to an increased thread braking force. The storage drive 11 is activated via the hand switch 10, the upper and lower storage rollers 13 and 13 'to move towards each other. At the same time, the Introducing roller 16 lowered into the thread field. Doing so the thread field evidently continuously on one common level brought into a middle position. The one there recorded different thread lengths, however are relatively small, are in the direction of arrow a from the gate deducted. The middle position is reached as soon as the insertion roller 16 has reached the edition 17 and the Pushbutton 18 activated.

Only now is the winding machine motor 20 with a certain one Reverse speed reversed. The top and lower storage rollers 13 and 13 'intersect and remove different from each other, obviously Thread loops are formed. The wrapping tree turns back in the direction of rotation c and the one already wound up Chain 9 is inserted into storage device 3 in the direction of arrow d moved in. However, the return speed is slower than the storage speed of the increasing thread loops, so that a continues in the direction of arrow a Difference length is subtracted from the gate. The thread tension remains constant, however.

According to FIG. 4, the storage device 3 has its maximum Storage capacity reached. The lower ones in the rest position Storage rollers 13 'are now in the upper end position and vice versa. The storage drive is operated via the lower limit switch 19 11, as well as the winding machine motor 20 switched off. The broken thread end is now exposed and can be picked up again.

To save the stored excess length, the Hand switch 10 operated on the winding machine. So that becomes a Forward creeper of the winding tree 5 and at the same time Reversing the storage drive 11 triggered. The creeper speed is greater than the withdrawal rate the shrinking thread loops, whereby again the resulting difference in length of the creel 1 is removed. The withdrawal movement is activated of the upper limit switch 21 ended. All backwards and forwards Running warp lengths are recorded by the guide roller 6. The The machine then has the starting position shown in FIG. 1 reached and can the normal winding process again record, tape.

Claims (11)

1. Method of accumulating an overlength of yarns between a bobbin creel (1) and the beam (5) of a beaming machine (4), in the case of a cessation in beaming, by means of deflection of a yarn warp (2) from a beaming position into an accumulation position under the formation of yarn loops by means of accumulator rollers (13, 13') that are displaceable in relation to one another, with the beam (5) being rotated in the reverse direction, characterized in that each yarn is subjected to a defined braking tension at the bobbin creel, that the reverse speed of the beam is less than the accumulation speed of the accumulator rollers and that the length difference arising from the difference between the reverse speed and the accumulation speed is compensated by further withdrawal of yarns from the bobbin creel under the influence of yarn braking tension.
2. Method according to claim 1, characterized in that, prior to reverse rotation of the beam, the yarn warp (2), running in the spread position for the beaming procedure, is brought into one plane by means of the accumulator rollers (13, 13') and that the yarn lengths thus taken up are further withdrawn from the bobbin creel.
3. Method according to claim 2, characterized in that, while the yarn warp is being brought into one plane, a lead-in guide roller (16) is moved into said warp plane on the creel side, said lead-in guide roller remaining in the common plane in a mid-position while the accumulator rollers (13, 13') are further displaced for formation of yarn loops.
4. Method according to claim 3, characterized in that on reaching the mid-position a switching device (18) is actuated, said switching device actuating the reversal of the beaming machine.
5. Method according to one of the claims 1 to 4, characterized in that, for roll-out of the overlength, the accumulator rollers (13, 13') are returned to their start position while the beam is driven forwards at crawling speed, the crawling speed being greater than the roll-out speed of the accumulator rollers, and that the length difference arising from the difference between the crawling speed and the roll-out speed is compensated by further withdawal from the bobbin creel under the influence of braking tension.
6. Device for accumulation of an overlength between a bobbin creel (1) and the beam (5) of a beaming machine (4) in the case of a cessation of beaming, said device possessing a machine frame (23) through which the yarn warp (2) can be guided, in each case a lower and an upper group of parallel accumulator rollers (13, 13') being attached to a traction mechanism (12) in such a way that both groups are able to be displaced in opposite directions approximately vertically for the formation of yarn loops, characterized in that, for clamping-free introduction of the yarn warp (2), at least one lead-in guide roller (16) is arranged on the creel side, said lead-in guide roller being able to be moved from a position outside the yarn warp into a mid-position within the yarn warp, the mid-position lying approximately on the plane on which the groups of accumulator rollers (13, 13') cross.
7. Device according to claim 6, characterized in that the lead-in guide roller (16) is able to be lowered from above onto a limit-stop/support (17) arranged in the mid-position on the machine frame, and that on reaching said limit-stop/support, a switching device (18) can be actuated to reverse the beam.
8. Device according to claim 6 or claim 7, characterized in that a limit sensor (19, 21) is in each case able to be actuated at least by means of one accumulator roller at its upper and lower end position, the accumulation or roll-out procedure being able to be detected by said limit sensor.
9. Device according to one of the claims 6 to 8 characterized in that the traction mechanism (12) possesses endless chains fitted at the side of the machine frame around upper and lower chain deflection wheels (22, 22') and that a lower or upper accumulator roller is fixed on each span of an endless chain.
10. Device according to one of the claims 6 to 9, characterized in that an accumulator roller is arranged in the direction of yarn run (a) immediately after the lead-in guide roller, said accumulator roller being able to be moved in the opposite direction to the lead-in guide roller.
11. Device according to one of the claims 6 to 10, characterized in that said device possesses a drive module (15) and at least one detachable accumulator module (14) attached to said drive module, the drive module being equipped with a drive motor (11) for the traction mechanism (12) and with the lead-in guide roller, and the accumulator module possessing in each case at least one upper and one lower accumulator roller (13, 13'), and that the traction mechanism of said accumulator rollers can be coupled to the drive module.

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