Such machinery have adopted the feed-off-the-arm frame. They are key equipments for the cylinder garment sewing of different specifications and dimensions. The adoption of the needle bar thread-taking-up and bending needle thread-hooking can form the two-needle two-chainstitch or three-needle three-chainstitch. The maximum sewing speed can reach 4000 needles/min. Model MY8927/8928 machinery are applicable to the sewing of thin and medium-thick materials. The Model MY8928-PL/8927-PL machinery have adopted the joint feeding by the cloth-pulling wheel and the differential feeding mechanism and are applicable to the sewing of thick and extremely-thick materials. During the sewing, the feeding is smooth and reliable. Also, the dislocation and creepage of materials can be prevented. In the cross-seam sewing, such machinery are convenient and fast.