CH662135A5 - Method and apparatus for controlling a warping machine - Google Patents

Description

The invention relates to a method for controlling a warping machine according to the preamble of claim 1 and a control device for performing the method.

A major problem with such warping machines is the elimination of the thread breaks that occur during warping, which usually only occurs when trees are being used. So far, it has been customary for the operator to visually detect each thread break, stop the machine and then correct the thread break.

It is understandable that this method is not very efficient and that the warping machine is therefore crawled long before the expected location of a thread break so that the thread break point is not missed. This is in contradiction to today's requirements regarding rational production.

DE-OS 25 27 777 shows a method and an apparatus for piece length marking on cone warping machines during the warping phase in order to achieve exact piece length equality. With the help of a thread length measuring device and a warping drum revolution counter, the number of revolutions corresponding to a predetermined length is determined and stored. In the subsequent treeing program, the number of revolutions of the backward-running warping drum is then compared in a comparator with the stored numbers. If the numbers match, a marking is made on the chain between the warping drum and warping beam. Marking can be done by hand while the machine is stopped or by automatic marking. With this known method, no thread breaks are recognized and marked.

From DE-AS 19 66 734 and DE-OS 21 51 290, thread monitoring devices are known for determining the number of defects (quality defects, for example formation of thread beads) of a certain size in a thread sheet, for example in a warping belt, or the length of a defect in each case related to a certain length of the thread sheet regardless of the speed of the thread sheet. The thread sheet is checked for thread bulges or protruding fibers using optical means (light beam or photodetector). When predetermined error sizes are exceeded, these errors are registered and counted. At the same time, the distance traveled by the thread sheet of the warping belt is measured, so that the length of the errors and the number of errors, based on a specific length section of the warping belt, can be determined by appropriately assigning the error signals to the measured path. Depending on this, the peeling machine can be stopped to eliminate the errors. Even with these known devices, thread breaks can neither be recognized nor marked.

The object of the present invention is to design a method and a device of the type mentioned at the outset such that the retrieval of a thread break point recognized and signaled by an operator during the warping can be carried out precisely and without unnecessarily long creep times until the machine stops at the point of repair .

This object is achieved by the training according to the characterizing part of claim 1.

The design according to the invention automatically shuts down the system at the thread break points during the brewing process, so that the thread breaks to be remedied can be found and remedied more quickly and precisely by the operator during the bunching process of the warping bands. This can significantly accelerate and improve the production process.

A device for performing the method is in claim 2, and advantageous and expedient developments of this device are given in claims 3 and 4.

The invention makes it possible to minimize the creepage distance, but at the same time to give the operator enough time to prepare for the thread break repair. The creeper avoids a disadvantageous high-speed stop of the warping machine.

The display devices provided according to claim 4 represent further aids for the operator in the detection of thread breaks and in the retrieval of the thread break points.

The invention will be explained below with reference to the accompanying drawing using the example of a cone warping machine. It shows:

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1 shows a schematic representation of a functional diagram of a conical warping machine according to the invention,

FIG. 2 shows a schematic cross-sectional illustration and on a larger scale of some of the bands sharpened on the warping drum with enclosed thread break points, and FIG. 3 shows the arrangement according to FIG. 2 in development. The conical warping machine 1 schematically illustrated in FIG. 1 is used in a known manner to prepare the chain for weaving machines and the like. For this purpose, the warp threads 11 are first warmed in the form of adjacent warping bands 11a-1dd on a warping drum 2, the first warping band 11a support on one side on the cone 2 'of the warping drum 2 and the following warping belts 1 lb to 1 ld each on the free side surface of the preceding warping belt (FIG. 2). Here, the coulters of thread drawn off from the bobbins 30 of a warping frame 31 run as a respective warp belt through the warping reeds 34 of the warping carriage 32, which can be displaced parallel to the warping drum axis in a known manner.

In the subsequent treeing process, the side-by-side warping belts 11a-1d are then wound up together by the warping drum 2 onto a warp beam 40 that can be driven to rotate on the warping machine 1. Here, the direction of rotation of the warping drum 2 reverses from the direction of rotation 20 for the warping in the direction of rotation 21 for the trees.

In a known manner, the warping drum 2 is rotatably supported via side plates 3 and 3 '. A drive unit 4 serves to drive the warping drum 2 or the warp beam 40. It receives its control impulses via a control line 44 from a control unit 4 '. ■

The problem of eliminating the thread breaks in trees that occur during warping is now solved according to the invention essentially by the fact that a detected thread break in the thread family of the respective warmed band is keyed into a computer 50 by means of manually operable signal transmitter 51, which detects the signal based on this signal current warp thread length and the warping belt number or its position in the form of a signal generated by circuit means for continuously determining the warmed warp thread length and a preset position or warping belt number indicator 53, which then continuously or when switching the warping machine on trees registers the registered thread breaks in an order corresponding to the treeing process sorted, and which then further compares the length signals corresponding to the sorted thread break points with the signals of the circuit means determining the warp thread length via a comparison stage 56. Subsequently, an agreement signal of the comparison stage 56 supplied to the control unit 4 ′ then effects at least one control signal influencing the drive unit 4 for the yarn breakage elimination.

First, according to FIG. 1, the circuit means for continuously determining the warmed warp thread length can comprise a length pulse generator 54 which is functionally connected to the warping drum 2 and operates on a total length counter 52, the output of which is connected both to the computer 50 and to the comparison stage 56.

In order to be able to switch to crawl gear in good time and also automatically in such a warping machine, it is provided that the computer 50 receives a forward signal for the registered signal denoting the location of the thread break with a pre-selectable input that can be entered into the computer and corresponds to a defined distance from the location of the thread break Assigned time to generate a control signal switching the warping machine to the creeper gear, as will be described in more detail below.

The area code is advantageous during the construction of the

Machine set according to its use. All other warping data are entered via the input keyboard 9 of an input and display station 6 connected to the computer 50, made visible on the display 8 and then acknowledged.

In this case, at least the input and display station 6 is preferably arranged on the warping machine in a manner suitable for operation and preferably pivotable.

Furthermore, the computer 50 is advantageously assigned an optical and / or acoustic display device 7 for displaying at least the creep speed of the warping machine and for displaying the number of thread breaks on the creepage distance. In addition, the display device 7 can additionally display the relevant warping band, which has the thread break to be repaired, as is also explained in more detail below.

In the arrangement shown in FIG. 1, the display device 7 is arranged on the input and display station 6 and comprises four signal lamps 7a to 7d, which can be of different colors, for example red, green, blue and yellow.

The above-described computer 50 and all other control and switching means can be of a conventional type.

With reference to FIGS. 2 and 3, which show some sharpened warp thread bands 1 la to 1 ld with included thread breaks 12a to 12c, the sequence of a thread break repair according to the invention can be explained in more detail.

At the beginning of the warping process, feed, bandwidth, warp length, piece length and the like are entered using the warping data on the input keyboard 9 at the input and display station 6, checked in the display 8, acknowledged and transferred to the computer 50.

The above-mentioned signal lamps 7a to 7d can take over some display functions, in particular the signal lamp 7a can indicate the end of the chain both when warping and when treeing, whereas the further signal lamp 7b can also indicate the reaching of the piece length when warping and when treeing. The two remaining lamps, namely the blue lamp 7c and the yellow lamp 7d, fulfill a double function in that they indicate errors in the winding structure (too small or too large) during warping and serve to display the number of thread breaks to be corrected in trees. In addition, the signal lamps mentioned or others to indicate the location of the thread break to be rectified, e.g. of the warping belt or to the left-center-right position.

It is now assumed that a thread break 12a occurs after a warping length of 795 m during the warping of the first warping band IIa. When the band 1 lb was warped, a thread break occurred at 2270 m and when the band 1 ld was warped, the thread broke at 800 m. In contrast, the warp belt 1 lc is free of thread breaks in the assumption made here.

All of these thread breaks were recognized by the operator during warping and entered via the pulse generator 51 at the input and display station 6 into the computer 50, which, in response to this particular signal, indicates the current warp thread length and the warp band number or position in the form of one of the total length counter 52 and the The warping band indicator 53 generates a signal in order to subsequently sort all yarn break locations 12a, 12b and 12c in a sequence that corresponds to the overall tree operation for all warping belts and in the opposite direction, here 12b, 12c and 12a. In addition, the computer 50 assigns a predetermined specification for a predetermined creepage distance 14 to each thread break location, as can be seen in particular from the illustration in FIG. 3. This pre5

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there would be, for example, 10 m for the thread break location 12b which appears as the first in the tree, that is to say the creep path is initiated when the mark reaches 2280 m and the location of the thread break 12b in the warping band 1 lb is reached when the mark reaches 2270 m Machine stop, which allows the thread break to be repaired.

When the creeper is initiated, the yellow lamp 7d signals that it goes out when the machine stops at the 2270 m mark.

At the locations of the yarn breaks 12a and 12c which are closely spaced with respect to the rearing in the range of 795 m and 800 m warp thread length, the default for the yarn break location 12c is set at 820 m. When this point is reached, the creeper is switched on again and the signal is signaled by the yellow lamp 7d, whereupon the machine stops at the location of the thread break 12c at 800 m.

However, since the thread break 12a in the area of 795 m means that the advance position 14 falls within the range of the advance position of the thread break 12c, it must be signaled that more than one thread breakage has occurred in this area and has to be remedied. In order to be able to display this, the blue lamp 7c also lights up.

The thread break 12c is then reached in the further course of the treeing process, with both the yellow lamp 7d and the blue lamp 7c on-5 lighting up until this moment and indicating the additional thread breakage 12a.

If the machine stops in the area of the thread 12c at 800 m, the blue lamp 7c goes out, so that only the yellow lamp 7d lights up, which indicates that only a thread break has to be remedied.

If the thread break 12a is also reached in the area of 795 m, the yellow lamp 7d also goes out. All possible thread breakage sequences are thus recorded and controlled.

From the above, a warping machine results which is now able to meet all of the conditions presented. In particular, the measures taken allow an extremely safe and precise local binding of the thread breaks to be repaired during the warping of the warp threads onto the warp beam on the warping machine, which speeds up the production process considerably and also allows less qualified operators to be used.

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Claims (4)

662135 PATENT CLAIMS 1. A method for controlling a warping machine when thread breaks occur, with the control signals for a forward run of the warping drum for warping individual warping bands, for a backward running of the warping drum for common treeing of all warping bands on a warp beam, for a creeper to start at thread breaks during the treeing phase and for a machine stop to correct thread breaks, characterized in that all signals corresponding to the thread breaks occurring during warping are manually entered into a computer and each thread break signal is assigned a lead signal which corresponds to a preselectable time specification corresponding to a defined distance from the location of the thread break for the start of the crawl gear, it means that, based on these thread break signals, the current warp thread length or the drum rotations that have taken place since the start of warping and the warp belt number or the position of the warp belts are determined and registered Furthermore, continuously or when the warping machine is switched over on trees, the registered thread break signals are sorted in an order corresponding to the treeing process, that the signals corresponding to the sorted thread break points, the signals corresponding to the sorted thread break points are compared, and finally, based on a comparison signal, at least one warping drum Control signal switching and triggering the machine stop is generated. 2. Control device for performing the method according to claim 1, with a control unit controlling the drive of the warping drum, characterized in that the outputs of a manually operated thread break signal transmitter (51) and a warp thread length measuring device (52, 54) at the input of the computer ( 50) and that the outputs of the computer and the warp thread length measuring device (52, 54) are connected to the input of a comparison stage (56), the output of which is connected to the control unit (4 '). 3. Control device according to claim 2, characterized in that the warp thread length measuring device has a length pulse generator (54) which scans the warping drum and which is connected to a total length counter (52). 4. Control device according to claim 2, characterized in that a computer (50) powered optical and / or acoustic display device (7) for displaying the different operating states of the warping machine such as creeper, machine stop and the number of the respective thread breaks and / or the position of the the thread break or the thread break having a warp.