Straight and curved guide rail and straight and curved guide device
A straight-curved guide rail includes a straight part and a curved part and is configured to guide movement of a movable element. The straight-curved guide rail includes: a base part extending in a longitudinal direction of the straight-curved guide rail; and a track part, which is formed on the base part, extends in the longitudinal direction, and has a pair of rail ends, each including a track surface to be in contact with the movable element, on both side portions of the straight-curved guide rail in a width direction of the straight-curved guide rail. A region of the straight-curved guide rail, which includes an end portion of the straight-curved guide rail in the longitudinal direction, includes a low-stiffness region in which portions including the track surfaces have lower stiffness than stiffness of other region.
1 . A straight-curved guide rail which includes a straight part and a curved part and is configured to guide movement of a movable element, the straight-curved guide rail comprising:
a base part extending in a longitudinal direction of the straight-curved guide rail; and
a track part, which is formed on the base part, extends in the longitudinal direction, and has a pair of rail ends, each including a track surface to be in contact with the movable element, on both side portions of the straight-curved guide rail in a width direction of the straight-curved guide rail,
wherein a region of the straight-curved guide rail, which includes an end portion of the straight-curved guide rail in the longitudinal direction, includes a low-stiffness region in which portions including the track surfaces have lower stiffness than stiffness of another region, the low-stiffness region extending in the longitudinal direction to an end surface of the end portion of the straight-curved guide rail.
2 . The straight-curved guide rail according to claim 1 , wherein, in the low-stiffness region, the base part includes:
a first base part having a smaller length in the width direction than a length of the track part in the width direction; and
a second base part, which connects the first base part and the track part to each other and has a smaller length in the width direction than the length of the first base part in the width direction.
3 . The straight-curved guide rail according to claim 2 , wherein the track part includes:
a first track part that overlaps the base part in a height direction of the straight-curved guide rail; and
a pair of second track parts, which are formed on both sides of the first track part in the width direction and include the pair of rail ends,
wherein, in the low-stiffness region, the track part has a first cutout portion formed by cutting out a part of the track part from an end portion of the track part in the longitudinal direction so that the first track part and the second track parts are spatially separated from each other.
4 . A straight-curved guide device, comprising:
the straight-curved guide rail of claim 3 ; and
a movable element being movable on the straight-curved guide rail.
5 . The straight-curved guide rail according to claim 2 , wherein the track part includes:
a first track part that overlaps the base part in a height direction of the straight-curved guide rail; and
a pair of second track parts, which are formed on both sides of the first track part in the width direction and include the pair of rail ends,
wherein, in the low-stiffness region, the track part has a second cutout portion formed by removing the first track part from an end portion of the track part in the longitudinal direction.
6 . A straight-curved guide device, comprising:
the straight-curved guide rail of claim 5 ; and
a movable element being movable on the straight-curved guide rail.
7 . A straight-curved guide device, comprising:
the straight-curved guide rail of claim 2 ; and
a movable element being movable on the straight-curved guide rail.
8 . The straight-curved guide rail according to claim 1 , wherein the track part includes:
a first track part that overlaps the base part in a height direction of the straight-curved guide rail; and
a pair of second track parts, which are formed on both sides of the first track part in the width direction and include the pair of rail ends,
wherein, in the low-stiffness region, the track part has first cutout portions, each being formed by cutting out a part of the track part from an end portion of the track part in the longitudinal direction so that the first track part and the second track parts are spatially separated from each other.
9 . A straight-curved guide device, comprising:
the straight-curved guide rail of claim 8 ; and
a movable element being movable on the straight-curved guide rail.
10 . The straight-curved guide rail according to claim 1 , wherein the track part includes:
a first track part that overlaps the base part in a height direction of the straight-curved guide rail; and
a pair of second track parts, which are formed on both sides of the first track part in the width direction and include the pair of rail ends,
wherein, in the low-stiffness region, the track part has a second cutout portion formed by removing the first track part from an end portion of the track part in the longitudinal direction.
11 . A straight-curved guide device, comprising:
the straight-curved guide rail of claim 10 ; and
a movable element being movable on the straight-curved guide rail.
12 . A straight-curved guide device, comprising:
the straight-curved guide rail of claim 1 ; and
a movable element being movable on the straight-curved guide rail.