Abstract: Performance of a link apparatus is improved. A link mechanism (11C) included in the link apparatus includes, for example, a roller (110A) fixed to a link shaft (40A) via a bracket (100A), the roller (110A) being contactable with a link retainer (70).

Abstract: Link devices include a plurality of link mechanisms which are coupled so as to form an endless chain and can move along two rails. Each of the link mechanisms includes first and second rail holders, a plurality of guide rollers provided on the first rail holder and moving along one rail while rotating, and a plurality of guide rollers provided on the second rail holder and moving along the other rail while rotating. The plurality of link mechanisms include three-roller link mechanisms in each of which three guide rollers are provided on the first rail holder and two-roller link mechanisms in each of which two guide rollers are provided on the first rail holder, and the three-roller link mechanisms and the two-roller link mechanisms are arranged alternately.

Abstract: A film stretching apparatus includes: a pair of first and second link devices configured to be able to carry and stretch a film and each composed of a plurality of links coupled to form an endless chain; a heat treatment unit configured to cover a central portion of the first and second link devices and perform a heat treatment to the film; a sprocket (first link drive mechanism) arranged outside the heat treatment unit and on an inlet side of the film and configured to drive the plurality of links; a sprocket (second link drive mechanism) arranged outside the heat treatment unit and on an outlet side of the film and configured to drive the plurality of links; and a sprocket (link adjustment mechanism) arranged outside the heat treatment unit and on the outlet side of the film and configured to reduce a pitch of the plurality of links.