After the sofa fabric is arranged and cut, these fabric blocks need to be stitched together, which we call sewing technology.

 

(1) Sewing method sofa fabric in the bag before, some fabric blocks need to be stitched together, if necessary, but also add inline line.

 

(1) Trial sewing is to temporarily sew two pieces of fabric together, using trial sewing is mainly to help the positioning of the fabric, easy to check and adjust, trial sewing can be stitched with pins or wide stitches, to be formally stitched to remove the trial sewing pins or stitches. Flat seam, first of all, two pieces of fabric front side relative together, with pins and wide stitches to try to sew, and then along the edge of about 10mm formal sewing a line, and then try to sew the pin and line removed. For edge stitching, first make flat seams for two fabrics, then cut off part of one edge, and then paste the other edge on it, as shown in Figure 8-46. Embedding is the line inserted in fabric stitching, mainly used for cover stitching and edge modification.

 

 

Then sew stopper cloth and handle cloth together. The base, backrest and armrest are stitched together with stopper cloth respectively. After stitching, another seam should be pressed on the original seam. The hard edge place of sofa needs seam shake handshandle cloth, shake handshandle cloth is put in lowermost, it is embedded line among, it is face above. In this way the production line straight, handle cloth and face once the nail level, the middle line will naturally stand out. Another action of shake handshandle cloth is to give face position, definite size, make sofa outline is clear.

 

(2) Dark needle and dark nail needle suture should not rely on the sofa surface, commonly used in the exposed parts of the manual suture. Dark nail is used to nail the fabric with wooden frame, nail the appearance of the fabric can not see the nail.

 

(2) Synthetic sewing process of seat bag coat dark line, single line, double line, etc., is the external visual effect of the connection of the fabric after sewing. Dark line means that after sewing two fabrics, the seam line is inside, and the seam line is not visible outside; Single line refers to the basis of the dark line, only one side of the dark line is sewn, double line is based on the dark line, both sides of the dark line is sewn once. Before sewing, the fabric should be processed in a variety of ways.

 

(1) As the cloth is made of vertical and horizontal thread weaving, the edge will be off line and loose after a long time. Therefore, it is usually necessary to use the edge locking machine to lock each piece of cloth, and then the cloth is stitched between each other. Leather and artificial leather fabrics do not need to be hemmed. When hemmed, both hands control the cloth, do not swing around. After the hemmed, cut the hemmed thread.

 

(2) Shovel skin for some thick leather, due to sewing, the edge of the thick leather overlaps together will affect the visual effect, so sometimes the leather back at the edge of the leather shoveling machine shoveling thin, with rough grinding wheel sand off part of the inner leather fiber. Leather edge width depending on different requirements, generally 25mm.

 

③ Cotton pressing will cut leather or cloth and fiber cotton alignment, leather or cloth on the top, fiber cotton on the bottom, uniform pressure to the sewing machine, cotton pressing door is 5mm. Because fiber cotton is soft, fiber cotton is sewn in clingy dermal inside, sponge outside, the vision when can assure sofa is used is full, touch is downy. After sewing, use scissors to trim off excess cotton.

 

(4) Combine two pieces of leather or cloth together with two hands and press them to the sewing machine. Ensure that the upper and lower leather materials or cloth are fed at the same speed. When sewing should always check the alignment of scissors, so as not to misposition. The cutting edge is a triangular notch cut on the outer edge of each piece of leather and cloth. If there is no cutting edge, it will be marked and cut in accordance with the template on the leather surface. Because each piece of material is independent, it is very difficult to find and match during sewing, therefore, the edge of each piece of fabric will have a cutting edge, and the position of the cutting edge of the stitched fabric coincides. When sewing, the edge between two fabrics should be overlapped, generally in the outer fabric of the sewing width of about 12mm, thick leather sewing width to increase to about 20mm.

 

(5) The pressure line for the thick seam at the joint to cut the Angle, so as not to affect the positive visual effect, pay attention not to cut the wire, so as not to take off the line, with both hands to separate the skin level, with one hand to take the skin, with one hand to draw the line, with both hands to lift the surface of the bottom line knot. In the thick leather sewing behind the need to bend, after sewing, but also in the inner need to bend the edge of the more dense cut, so as to avoid leather bag front deformation.

 

⑥ Check whether the process fold is even and symmetrical. Check whether the leather and cloth pieces have jumper and obvious floating line, whether the line is straight, smooth, wireless head, dark seam between 12~15mm, the double side pressure line is 10mm apart, the seam is in the center, unilateral line distance joint 5mm, needle distance 4-6mm, pay attention to whether the leather cloth color is consistent, there is no obvious color difference, cloth pattern is symmetrical.