DE3618467A1 - Control for weaving machines - Google Patents

Abstract

The control described for weaving machines makes it possible to control the weaving machine directly from the video screen, for example by means of patterns supplied by floppy disk. Each thread guide is to be activated individually and can be moved into the upper or lower end position or an intermediate position with exactly defined movement characteristics without further mechanical control means. This also makes thread introduction much easier, because, for example, it is possible to move only the thread guides provided for one colour into the upper end position and all the others into the lower end position, so that very good accessibility is achieved. Since this function takes place automatically via the program and the evaluation of the video-screen pattern, there is also no possibility of errors as a result of the incorrect guidance of the threads of different colours. The small dimensions of the actuating members for the thread guides also afford above-average accessibility even in the case of very fine weaving patterns. The possibility for a modular design reduces the production costs, for larger working widths are achieved merely by means of additional thread guides which are always identical to one another. Only the current supply to the coil systems which execute the adjustment of the thread guides is to be rated higher. The entire control system also remains identical.

Description

If colored patterns are to be created during weaving, then colored warp and / or weft threads partially visible the surface of the fabric, partially invisible on the Bottom of the fabric led.

This is achieved in that colored warp threads in se separate thread guides with punch cards, cam chains or similar controlled, raised or lowered so that they run visibly in places over the base fabric.

Systems are known in which the warp threads for generating the patterns via cam chains or punch cards and pneumatic lifting elements can be controlled.

All of these methods have in common that costs and Preparation times for small and very small lengths are high.

The task of control is made more difficult by that not only two end positions have to be approached, but that a precisely defined speed ver between the two end positions is required to Keep mass forces on threads and thread guide small and that intermediate positions may also be approached Need to become.

The confined spaces are another problem Ratios especially with very fine-meshed fabrics.

To the problems of a precise synchronization of the movement processes on the top and bottom of the fabric from the Movement control is usually done on one way against spring force, but also at the expense of Platzbe may and increases the movement forces.

According to the invention, the fact that a Iron core is drawn into a magnetic coil. The Traction depends on the position of the iron core and the Strength of the magnetic field.

There will be a bobbin system on the individual thread guide Top and a coil system provided on the bottom. The magnetic fields for the top and bottom can be over the digitally specified by the program and via D / A converter voltage converted into supply voltage for the coils be specified exactly. The course of force over the way the thread guides is thus over the top and bottom the thread guide synchronized.  

If intermediate positions are required, coils can also be used connected in series and via a separate circuit Fixed stops for the iron cores can be switched on.

Only tensile forces are exerted on both sides of the thread guide exercised so that the forces over thin wires or threads can be transferred and redirected as desired.

Distribution of the coils over each is required possible space. The space requirement is only from the Size of the thread guide depends.

Several rows of thread guides can be offset from one another be arranged so that the fineness of the fabric is not of the process, but of the accessibility and operation limits are set.

The procedure is based on the example of a commercial one PC's explained. For construction, enlargement, reduction, There is enough displacement and distortion of graphics Programs that are not the subject of this application.

Such graphics can be made by specialist companies Diskette bought or provided on diskette by the customer will.

The screen memory is saved by the described method evaluated. In a search, the picture is removed from the program keyed and a header for each color created in the the position of the warp threads is indicated in columns. Soon It is determined in advance how often each warp thread appears in the picture is coming. Threads that are too rare can be found in the header eliminated and the optimized image shown.

These points can then be programmed to a colored weft thread is inserted at this point. The pixels shown in the intended pattern the scanned by the web program.

The color attribute of the pixel is decoded and with compared to the header. Does it match a color of Header corresponds to that will correspond to this point transfer color to the interface. This color is coming in the position of the header, so the Interface passed a signal at that point the bobbin of a corresponding colored weft thread in Shot position must be brought.

From the interface, column position and color of the warp transferred into the machine control.

Depending on the previous and new position of the colored warp thread the corresponding coil pair with one of the voltage paths connected - the holding voltage for the upper end position, the holding voltage for the lower end position, the controlled one Tensions to move the thread into the lower or upper end or intermediate layer.

After completing the evaluation of a line, the Pro runs Gram to control the voltages for the adjustment of the Thread guides. Do all thread guides have their intended End position reached, the shot is triggered by the program and evaluated the next image line. Reaches the program the end of the picture, it jumps back to the beginning.

Claims (12)

1. Control for weaving machines, characterized in that the pattern to be weaved is delivered on disk 2. Control for weaving machines according to claim 1, characterized in that the proposed pattern a search and optimization program runs through, with a header for each color on the Screen is created from which the position of the colored Warp threads can be seen. 3. Control for weaving machines according to claim 1 to 2, characterized in that in addition to the position of the colored warp threads also the number how often this thread is determined in the intended image pattern appears. If this is too low, the thread in the header bar and thus these pixels from the Pattern removed and the pattern optimized. 4. Control of weaving machines according to claim 1 to 3, characterized in that the colored threads deleted from the chain according to claim 3 were programmed as weft threads. Will this Color point detected during weaving, so the program turns the bobbin brought in this position with this color. 5. Control for weaving machines according to claim 1 to 4, characterized in that the setting data for each column - desired color above or corresponding spool in firing position, other colors below or if necessary in an upper or lower intermediate position together with the column number - to the interface to Machine control are output. 6. Control for weaving machines according to claim 1 to 5, characterized in that after comparing these values with those from the previous shot for this position values the thread guide to one of the Control current paths - hold up, hold down, move up, move down, move into one of the intermediate positions is switched.   7. Control for weaving machines according to claim 1 to 6, characterized in that each individual thread guide eyelet with a flexible, arbitrary deflectable transmission link, each with a moving coil system is connected to the top and bottom of the fabric. 8. Control for weaving machines according to claim 1 to 7, characterized in that both moving coil systems listed in claim 7 with the same Longitudinal axis can be executed multiple times, so that any Intermediate positions can be reached, depending on which one of the additional systems is still controlled and the path of Core of the main coil system limited. 9. Control for weaving machines according to claim 1 to 8, characterized in that the subroutine after transfer of all values for one image line to generate the desired voltage profile for the coils The top and bottom of the thread guides expire so that each one individual thread guide with a precisely defined force curve The top and bottom are moved to the desired position. 10. Control for weaving machines according to claim 1 to 9, characterized in that in the event that intermediate positions are required, the cores of the thread guide bobbin system by coaxially arranged addition coil systems with their cores are limited in their way. 11. Control for weaving machines according to claim 1 to 10, characterized in that the individual control of each thread guide the construction of a modular system, in which the same individual elements in any number can be strung together and the Complete systems only through the efficiency of the power supply differ. 12. Control for weaving machines according to claim 1 to 11, characterized in that it allows the individual control of each thread guide that To call up thread guides in groups, e.g. one after the other different colours. So the other thread guides are in one end position, the one called in the other. This improves the accessibility for insertion and the The correct thread distribution is easier for operating personnel.