Abstract: A guiding device includes a straight track, an arc track, and an interconnecting track joining the former two, where the interconnecting track has two opposite rolling contact surfaces, one with the profile being identical to that of the arc track and the other with a variable-curvatured profile. Only two rolling members are provided to roll on the side of the arc profile and only one rolling member is provided to roll on the side of the variable-curvatured profile, achieving a result that the rolling members driving a movement of a moving body remain contact with corresponding tracks in their rolling motion so as to improve stability and smooth transition of the device in motion.

Abstract: A multiple weighing apparatus with dual acting hopper gates mechanism comprises a feeding device conveying articles to be weighed and packed to a weighing section of the apparatus. The articles which are transferred into the weighing section are weighed and a portion of which having a desired weight is then allowed to move into a packing section to be packed therein. Each pack of the articles will have a desired weight. The weighing section comprises a plurality of pool hoppers and weighing hoppers controlled by a central controller. Each of the hoppers comprises a body having therein a space for receiving the articles and a discharge port closable by two gates. A Stephenson III type six-bar mechanism is adapted to operate the gates with the gates being the output links thereof. A pushing rod which is controlled by the central controller is used to move the input link of the six-bar mechanism to open the gates.