Flat belt

Abstract

[Problem] In a clutch mechanism using magnetic force, the problem is to avoid early damage to the rubber layer in contact with a rotating member without impairing the power transmission interrupting function of the mechanism. [Solving Means] A flat belt includes a tension-resistant layer 2, in which a core cord 2a is spirally wound, an upper holding rubber layer 3, a lower holding rubber layer 4, an upper rubber layer 5, and a lower rubber layer 6. The holding rubber layers 3 and 4 are laid on the upper and lower sides of the tension-resistant layer 2 respectively, retaining the layer 2. The upper and lower rubber layers 5 and 6 are laid on the upper side of the upper holding rubber layer 3 and the lower side of the lower holding rubber layer 4 respectively. 150-300 parts by weight of ferrite for 100 parts by weight of rubber matrix are mixed in the upper rubber layer 5, which is on the outer peripheral side of the flat belt when the belt is wound on a guide wheel.

Dependencies are inferred from the claim text.