Abstract: A toggle link clamping mechanism with a negative rear angle comprises a tail plate, a movable mold plate, and a toggle link mechanism. The toggle link mechanism comprises a thrust seat and a pair of link assemblies symmetrically distributed with one above the other. Each link assembly is composed of two independent front links, three independent rear links, and a small link, wherein front ends of the two front links are hinged to a rear face of the movable mold plate, rear ends of the two front links are hinged to front ends of the three rear links, rear ends of the three rear links are hinged to a front face of the tail plate, one end of the small link penetrates through a middle portion of the rear link in the middle and is hinged to the middle portion of the rear link in the middle.

Abstract: The attention recognition embodied by the method for evaluating the concentration ability of a sensory assessor is organically combined with evaluations for three categories of ranking capability, namely, excellent, good, and poor. Therefore, sensory assessors displaying high sensibility and poor attention form part of the group possessing excellent ranking capability, while sensory assessors exhibiting moderate sensibility and high attention can be found in the group possessing good ranking capability. Furthermore, sensory assessors displaying fair sensibility and high attention can be found in the group with poor ranking capability. This system can identify the concentration ability of assessors, therefore, providing support for the reliability of ranking results.