Focusing on the creative ideas for resolving the industrial problems is the purpose of all the research and development units all over the world. “Set Marks” is one of the interesting and challenging issues in which many groups have been interested in the third decade of the 20th century. Many studies performed on set mark were based on mathematical and experimental modles and laboratory expriments. If the configuration of warp-weft textile is considered as a grid consists of two orthogonal groups of solid parallel bars, the space between the bars has important effect on the textile features like as permeability against liquids, light refraction, and textile shading. Set mark means the pickspace non-uniformity emerging in the woven fabric after restarting the machine. When the machine is restarted, two factors lead to the set mark defect. These two factors are: movement of the cloth fell because of creep in the structure of yarn or fabric, and instability of dynamic force. The goal of this research is to determine the optimal condition of weaving machines to minimize the set mark defect in the elastic textiles. Several techniques have been presented to resolve the set mark problem. However, because of applying heavy load to yarn in two phases of shed timing and beat up, and also because of lack of physical segregation of yarn and fabric elements, it is difficult to measure the creep and dynamic force of the weaving machine. Getting reliable and correct feedbacks about the position of cloth fell can ease the process of detection and correction of defects. In our research we try to present and design a totally industrial module based on mechatronics knowledge which has unique features like as reliable and delayless functionality, establishment in the minimum distance from the fore dead, installation ability in whole of weaving looms only with new design in structure, easy installation without any disturbance or altering on the process of weaving, and portability for measurement of the mentioned quantity. Considering the high interest in the elastic textiles in the recent decades, in our research we evaluate the set mark problem based on Taguchi design of experiment method. The start and stop angles, shed timing time, the vertical position of back rest roller are considered as input factors. In addition, the objective function is defined as the minimum standard deviation of pick space from their normal value. The results of our research showed that the start angle factor has the highest effect and the stop angle factor has the lowest effect on the optimization process. Keywords: cloth fell position, weaving settings, distance measuring sensors, taguchi method