The Overall Design of Humanoid Cross-Stitch Machine Based On Computer Embroidery

Computer embroidery is a kind of cross-stitch automatic machine which is very common on the market at present, it can complete the different colors and styles of embroidery according to the cross stitch pattern, but for the embroidered cloth without cross grid requirements, and the quality of cross stitch also has the certain problems. What the design of humanoid cross-stitch machine considers is to imitate human hand embroidered action. The overall design of the whole machine, thread cutting mechanism, line stop mechanism, embroidery needle clamping and line library achieves completing the automatic operation on the basis of quality assurance. KEYWORD: Computer Embroidery; Cross Stitch; Mechanism Design; Automatic Operation International Conference on Industrial Technology and Management Science (ITMS 2015) © 2015. The authors Published by Atlantis Press 529 embroidery. The Z direction is achieved by the servo motor and the planet reducer to drive the ball screw to complete the Z direction of movement. 3 EMBROIDERED CLOTH FIXED Cross-stitch cloth can be divided into plastic cloth, cotton and linen fabrics, because of these fabrics have elasticity, and the embroidered cloth gap between the grid is very small, so in order to achieve accurate embroidered with beautiful patterns, it is necessary to accurately fixed embroidered cloth. Embroidered cloth fixing structure mainly consists of the following parts: 3.1 Adjustable frame Considering the current market sizes of many kinds of embroidered cloth and diverse, so it is necessary to design a structure that can meet the size variable condition. At first, to design a frame, the size of which should take into account the maximum embroidered cloth size of 1000*1000, frame is designed into square steel hollow, the two frame is transversely arranged on a rectangular square steel, which can move in the frame. Adjust the embroidered cloth size to what we need after fixed with bolts, embroidered cloth is placed in a rectangular tuned flat steel to complete the embroidered cloth positioning of different sizes. 3.2 The width direction embroidered cloth clamping and tightening Embroidered cloth need accurate positioning and clamping in two directions, after the embroidered cloth have good location, it needs the embroidered cloth clamp. The width direction using two plates to press the edges of embroidered cloth, considering that not to damage the embroidered cloth, the pressure plate is pressed on the outer edge of embroidered cloth, the outer of press left some size to two plates by a bolt, so as to realize the clamping of embroidered cloth. In order to ensure the accurate positioning of embroidered cloth in the coordinate of machine tool, this paper design a coordinate dimensions in the plate, and the plate design with holes, with a pin fixing the embroidered cloth in the corresponding coordinates, and then using the platen to clamp. 3.3 The length direction embroidered cloth clamping and tightening Width of embroidered cloth rack designed in this paper is based on the current market's biggest embroidered cloth size 1000mm, but the length size is a center size, so when the rack of embroidered cloth is not the design size, we need to consider how to fix this variable embroidered cloth. The structure as the following 1 show: In the width direction, the embroidered cloth has accurately position, when fixed the length direction, due to the clamping embroidered cloth have interference between the plates, so the method can’t be the same with the width. The design of the clamping mechanism in this paper is as follows: Because of the variable length of embroidered cloth, so we use the roller to achieve the tension, that is connecting the embroidered cloth with the roller. With this piece of embroidered cloth and the embroider cloth that needed to connect the stitch embroidering cloth by pressing and rotating the wheel, to achieve the embroidered cloth tightening. When connecting the two embroidered cloth with the press plate, considering the variable size of embroidered cloth, so using the connection plate at both ends, considering the actual size, the intermediate can be connected by bolts according to the connection pieces of plate, after the clamping and using the roller to brace. Figure 1. Embroidered cloth fixing mechanism. 4 EMBROIDERY NEEDLE CLAMPING MECHANISM Embroidery needle clamping mechanism is used to realize the embroidery needle clamping and turning, mainly consists of two aspects, on one hand, how to realize the embroidery needle clamping, the embroidery needle can move along the Z direction of track, on the other hand, when the clamping embroidery needle move at the top, how to flip the embroidery needle to stitch embroidery action. Embroidery needle clamping adopts the push-pull electromagnet, power on and off by controlling the magnetic attraction, push rod move back, to complete the embroidery needle clamping. “A connecting rod type clamping mechanism symmetry optimization” design the optimization of the clamping mechanism [6], clamp body holding mechanism part is a cylinder at the end of the intermediate machining gap embroidery needle thickness, which is used to put the embroidery needle for clamping, placed the push-pull electromagnet mechanism by the side of cylinder gap, then it can realize the embroidery needle clamping, the clamping mechanism move along the