The loop-forming principles of yarn feeding apparatus in the carpet tufting machine is introduced, then the mathematic model of transversing bucking-out system is created and the formula of theoretical compensation rate is obtained, which measured up to physical circumstances according to the loop-forming principles and rug-overtufting technological requirements.

Aiming at the design and manufacture of new-type fixed semi-automatic hay baler,the working principle and structure of the key parts of hay baler,including compressing mechanism,intake mechanism,separate-bundle mechanism,are expatiated,among which the intake and separate-bundle mechanisms are its features.