Sheet member holding apparatus
AssigneeFuji Photo Film Co., Ltd.
InventorTakashi Fukui
Life of this patent
Estimating the term…
Abstract
A sheet member holding apparatus which holds a winding direction end portion of a sheet member that is wound around a rotary body. Centrifugal force generated by rotation of the rotary body is efficiently utilized to hold the end portion securely and prevent looseness or the like of the sheet member, because the holding apparatus is designed such that the expression {(μ1+μ2)×(L2/L1)×m}>c×r×t is satisfied. L1 is distance from a fulcrum to a clamp section, L2 is distance from the fulcrum to a center of gravity, m is mass of a plate of the apparatus per unit length in the rotary body's axial direction, t is thickness and c is density of the sheet member, and μ1 and μ2 are coefficients of friction between the sheet member and, respectively, the clamp section and the rotary body.
Claims7
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 μ2;
- (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 μ1, 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 (μ1+μ2)m(L2/L1)>crt is satisfied.
Dependencies are inferred from the claim text.