The plunger in the fully depressed position releases the needlecarrier from the end of the barrel and the vacuum pulls the needlecarrier and needle into the hollow plunger.
柱塞 在完全压下的位置将针头座子从针筒的端部释放，真空将针头座子和 针头推入空心柱塞。
2
So the machine has many controlling assemblies such as needle selecting, triangle changing, density adjusting, needle bed moving, thread-carrier changing etc.