Patent ID: 6668722
Filing Date: 2003-12-30
Classification: B41C,B41F,H04N

Abstract:
A holding apparatus for a sheet member which has a density c and a thickness t, the apparatus comprising:(a) a rotary body having a radius r and an outer peripheral surface around which the sheet member can be wound, a coefficient of friction between the sheet member and the outer peripheral surface being &mgr;2; (b) a support attached to the outer peripheral surface of said rotary body; and (c) an arm comprising two end portions and an arm portion supported by said support between said two end portions, said arm having a weight m per unit length in an axial direction of said rotary body, said arm being pivotable about a fulcrum at said arm portion, said arm having a clamp section provided at one of said end portions at a distance L1 from the fulcrum for applying pressure to the sheet member, which is disposed between said one end portion and the outer peripheral surface of said rotary body, a coefficient of friction between said clamp section and the sheet member being &mgr;1, and said arm having a center of gravity at a position between the other of said end portions and the fulcrum at a distance L2 from the fulcrum, wherein the expression (&mgr;1+&mgr;2)m(L2/L1)>crt is satisfied.