US 12,214,542 B2Granted

Link device and stretching machine

AssigneeThe Japan Steel Works, Ltd.

InventorsNaoaki Yoshimatsu, Ichiro Nakajima

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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.

Claims11

Dependent claims

A link device used in a stretching machine for stretching a film, the link device having a plurality of link mechanisms which are coupled so as to form an endless chain and can move along two rails,

wherein each of the link mechanisms includes:
a first rail holder and a second rail holder;
a base member bridging the first rail holder and the second rail holder;
a link plate having one end rotatably coupled to the second rail holder and the other end rotatably coupled to the first rail holder of another link mechanism;
a clip provided on the base member and gripping the film;
a plurality of guide rollers provided on the first rail holder and moving along one of the two rails while rotating;
and
a plurality of guide rollers provided on the second rail holder and moving along the other of the two rails while rotating,
wherein 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
wherein the three-roller link mechanisms and the two-roller link mechanisms are arranged alternately.

7 more elements

A stretching machine comprising a pair of link devices configured to convey and stretch a film,

wherein each of the link devices has a plurality of link mechanisms which are coupled so as to form an endless chain and can move along two rails,
wherein each of the link mechanisms includes:
a first rail holder and a second rail holder;
a base member bridging the first rail holder and the second rail holder;
a link plate having one end rotatably coupled to the second rail holder and the other end rotatably coupled to the first rail holder of another link mechanism;
a clip provided on the base member and gripping the film;
a plurality of guide rollers provided on the first rail holder and moving along one of the two rails while rotating;
and
a plurality of guide rollers provided on the second rail holder and moving along the other of the two rails while rotating,
wherein 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
wherein the three-roller link mechanisms and the two-roller link mechanisms are arranged alternately.

8 more elements

Dependencies are inferred from the claim text.