Patent ID: 8453994

Claim:
An engagement chain type driving device comprising: a pair of driving sprockets, which rotate positively and reversely in opposite directions while facing each other about a pair of rotating shafts arranged in parallel with a setting surface; a pair of engagement chains, which engage with each other by said pair of driving sprockets so to be integrated together and disengaged from each other; and a driving source, which drives said pair of driving sprockets, wherein the engagement chain includes inner tooth plates and outer tooth plates, which each include buckling limiting flat surfaces, the inner tooth plates and outer tooth plates being brought opposite to each other and into contact with each other when the engagement chains are integrated by the pair of driving sprockets, such that the flat surfaces hold the chain engagement position, wherein the buckling limiting flat surfaces are bulgedly formed so as to elastically deform when they are brought into surface contact and interfering with each other, wherein the inner tooth plates and outer tooth plates both include a hook-shaped engagement surface comprising a convex element and a curved engagement receiving surface comprising a concave element, the inner tooth plates and outer tooth plates being integrated by said driving sprockets, and wherein interference avoiding spaces are formed so as to prevent interference between engaged inner tooth plates and outer tooth plates, the interference avoiding spaces being formed such that when opposing outer tooth plates engage with each other, there is no contact between the convex element of the hook-shaped engagement surface and the concave element of the curved engagement receiving surface.