A study on mechanical factors affecting register precision of rotary screen;

And the register precision is the key technology to improve the quality and quantity of the printing products.

Results show that the alignment accuracy is obviously improved by the (electro-)optical modulation.

The analyzing results show that LAPLAC operator is better than the others according to placement and alignment accuracies,but the revised SOBEL II operator is the best method of the alignment accuracy,and it has the shortest aligning time and the highest align.

, followings are acquired: relative accuracy ±003 % absolute accuracy ±002 %, α≤±761×10 -10 ℃ -1 , trace α≤50×10 -10 ℃ -1 .

To calculating the relative accuracy has to use the error under the original datum andthe new datum is only used for the begining position of the calculation.

Under the condition to meet engineerings and relevant codes ,when the grad II control grid networks are built for the small factory area, the simple gauge and callrlating methods can be applied ,and the relative accuracy can be used as a main target to evalute the accuracy of the yridnetwork.

, followings are acquired: relative accuracy ±003 % absolute accuracy ±002 %, α≤±761×10 -10 ℃ -1 , trace α≤50×10 -10 ℃ -1 .

Based on the theory of error propagation and the practical accuracies of A and B order and local GPS nets in China, it is firstly demonstrated that the absolute accuracy of the GPS ellipsoidal height.

When industrial robot works as a teaching and playback robot, the main performance index is repeatability accuracy, and when works as an off-line programming robot, the main performance index is absolute accuracy.