Patent ID: 6655111
Filing Date: 2003-12-02
Classification: B31B,B65B

Abstract:
A bag mouth opening device for continuously conveyed bags in which both sides of a mouth of each one of bags that are continuously conveyed at a uniform speed and equal intervals are suction-chucked by a pair of facing suction-chucking members, and then said suction-chucking members are separated from each other so as to open said mouth of said each one of said bags, wherein:said pair of suction-chucking members continuously revolve: in mutually opposite directions on circular tracks on a plane that is substantially parallel to a conveying direction of said bags and substantially perpendicular to surfaces of said bags, and in a state in which suction-chucking surfaces of said suction-chucking members are kept facing each other; time required for said respective suction-chucking members to complete one revolution is set to be at an integral multiple of time required for said each one of said bags to be conveyed over a distance between bags; said pair of suction-chucking members revolve at a constant speed while maintaining substantially symmetrical positions with respect to each other and at a same speed as a conveying speed of said bags; each suction-chucking member of said pair of suction-chucking members is provided on each one of rotation transmitting members; said each suction-chucking member and said one of rotation transmitting members on which said each suction-chucking member is provided perform a translational motion of the same radius of revolution and in the same direction of revolution as each other; and a mechanism that causes said rotation transmitting members to perform said translational motion comprises: two rotating shafts that rotate in synchronization in the same direction, and supporting shafts which are attached to said rotating shafts in eccentric positions that are offset by in the same direction and equal distances, said supporting shafts revolving about said rotating shafts as said rotating shafts rotate, wherein said rotation transmitting members perform said translational motion by way of being connected to said supporting shafts.