Patent ID: 6978961

Claim:
A band sheet coiling tension applying apparatus comprising: two sets of endless belts disposed oppositely upper and lower, each set of endless belts including a plurality of endless belts laterally arranged side by side and two, upper and lower, pressure applying members which hold each of said set of endless belts in a state that said endless belts freely circulate in an oval shape state, and which press inner surfaces of said endless belts, and which are inserted in an inner part of said endless belts, respectively; wherein each said pressure applying member comprises at least a belt pressing part which has a linear shaped in sectional side for directly pressing said inner surfaces of said endless belts; and belt reversing parts being arcuate in cross section, belt reversing parts being provided on both sides of the belt pressing part; and a plurality of belt guide protrusions for separately guiding said endless belts being arranged side by side on said belt reversing parts, wherein a coefficient of friction of an outer surface of each said endless belt is larger than that of said inner surface thereof, wherein said endless belts are pressed against both surfaces of slit band sheets which are passed between the outer surfaces of said upper and lower side, oppositely arranged endless belts by said pressure applying members which are inserted in the inner part of said endless belts, whereby said endless belts are driven to move by a friction engagement between said endless belts and said slit band sheets to independently circulate said endless belts in an oval shape fashion in unison with said slit band sheets, and a tension is generated in said band sheets by a friction force between said pressure applying members and inner surfaces of said endless belts, wherein for each of said upper and lower pressure applying members, a first cooling chamber is disposed within said belt pressing part and a second cooling chamber is disposed inside each said belt reversing part.