Textiles: weaving – Miscellaneous – Loom cleaning
Patent
1985-05-23
1987-06-02
Kee Chi, James
Textiles: weaving
Miscellaneous
Loom cleaning
139 1R, 139336, 1393701, D03D 5108
Patent
active
046695109
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention:
The invention is directed to a process and apparatus for controlling a weaving machine which is stopped by an error signal of a filling breakage detector, wherein for pick finding, the weaving program of a control device of a shedding apparatus is set back and the pick finding occurs with the weaving machine running forward, and at least the cloth takeup being correspondingly set back.
2. Description of Related Art:
Processes of the above-named type are known, for instance, from the DE-OS No. 25 14 248. The process described there has, however, the disadvantage that the weaving machine apart from the stop, which is caused by an error signal of a filling stop motion, must perform two additional stops during a pick finding cycle, before the normal weaving process can be resumed. For the pick finding, furthermore, only one normal shed is available, so that tight limits are set to the stopping and the restarting of the weaving machine. Thus, the known process is cumbersome and time-consuming.
SUMMARY OF THE INVENTION
It is an object of the invention to create a process for control of a weaving machine which does not exhibit the above-mentioned disadvantages. Furthermore, also a double dobby weaving machine must is operable according to this process.
The above object is achieved in a process for controlling a weaving machine wherein, in each pick finding cycle, after being set back, the step-by-step action of the weaving program in each pick finding cycle is blocked at least for that shed, which follows the shed in which the ruptured filling thread is being searched for, in such a way that the shed to be examined remains open, at least as a double shed, during at least two filling cycles, whereupon the continuation of the sequentially correct next normal weaving process is triggered or, prior thereto, the pick finding cycle is repeated for respective preceding sheds accompanied by corresponding set backs of the weaving program, until the ruptured filling thread is found.
By designing the shed which has to be examined for the filling cycle as a double shed there results the advantage that considerable latitude is given with respect to stopping the weaving machine. On the other hand it is possible to immediately restart from this position of the weaving machine wich serves for the purpose of pick finging, without that the weaving machine would have to be first of all brought into a starting position. Thus the process is rendered to be more simple, more rapid and thus more economical.
It is particularly advantageous if the weaving machine stops in the first shed crossing following an error signal of the filling breakage detector. This makes possible, in particular in the case of double dobby weaving machines, the synchronization of the two weaving machine units. For a single weaving machine this stoppage may occur between the first and second shed crossing following the filling thread rupture, because there are no such high requirements with respect to accuracy in case of stoppage.
Particularly advantageous is also a refinement of the process in which at least a fabric takeoff and possibly the warp letoff is set back by a magnitude G, whereby G=K.multidot.L, in which: L is the cloth length between two filling insertions and k Correction factor, wherein K=0.1 to 4, since then, possible errors of the cloth layer can be avoided. The correction factor can be freely chosen and depends, as a rule, on the properties of the cloth to be fabricated. The correction factor is therefore adjusted only once for the production of a specific cloth.
After the first stoppage of the weaving machine caused by the filling stop motion, the process can appropriately be triggered manually. It is, however, also imaginable to trigger the pick finding cycle directly by the error signal of the filling breakage detector.
The process can utilized for weaving machines of any type. Particularly advantageous is the use in a double dobby weaving machine. Accordingly, the weaving machine uni
Chi James Kee
Textilma AG
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