In the sewing machine technical engineering, it is very important to be familiar with the traction (pull force) of the feeding mechanism. In order to achieve the pre-set stitch length and reduce the drift between the fabric layers and the seam wrinkles to a minimum, it is necessary to have a feeding mechanism that meets the requirements. Sometimes it is thick material or smooth fabric that needs to be loose, and it is necessary to ensure the correct delivery of the fabric from start to finish. There are currently a variety of feeding institutions available in the market.
The standard feeding mechanism includes: bottom feeding, suitable for all standard sewing work; compound feeding, assisted feeding with the help of synchronous needle movement; harmonious feeding, which can sew multi-layer fabrics; bottom feeding and various upper feeding mechanisms, without cloth Staggered movement sewing between layers, applied to the requirements of bulging sewing; independent pulling and feeding device: for thick materials and sensitive fabrics; feeding wheel and roller presser driving device for thick materials and sensitive fabrics.
All these mechanisms can also be composed of different types of mechanical parts, such as presser foot type, needle plate type, and feed dog type; and require a special adjustment requirement at any time. This complicated situation shows that sometimes we will ask the measurement test team to compare different feed mechanisms and find its traction limit. The parameter that determines the function is always the stitch length of the stroke. Compare them with the preset stitch length.