Linear stopper

1. A linear stopper comprising: a one way stopper mechanism having a stopper body that is adapted to be detachably mounted on a guide member extending in a linear manner so as to guide an object for reciprocating movement, and has an inclined surface formed thereon, with a wedge-like space being constructed between the inclined surface and a surface of the guide member with a gap decreasing gradually toward one side of an extending direction of the guide member, rolling elements that are arranged in said wedge-like space so as to be rollable therein, and rolling element pressing means that presses the rolling elements in a direction to bite into the wedge-like space, so that the rolling elements are forced into pressure contact with the surface of the guide member and the inclined surface of the stopper body,

wherein the one-way stopper mechanism is provided to restrict the relative movement of the stopper body with respect to said guide member toward a side at which the gap in the wedge-like space is large, due to a biting action caused by the rolling contact of the rolling elements in said wedge-like space, and allows the relative movement of the stopper body with respect to said guide member toward a side at which the gap in the wedge-like space is small, due to the sliding contact of the rolling elements in said wedge-like space,

said linear stopper further comprising:

at least one pair of the one-way stopper mechanisms in which the directions of wedge-like spaces with respect to the guide member are mutually opposite to each other, so that the relative movement of the stopper body with respect to the guide member is restrict to opposite sides of an extending direction of the guide member; and

a rolling element release means that serves to force the rolling elements arranged in the wedge-like space of at least one of the one-way stopper mechanisms to move in a direction in which the gap in the wedge-like space becomes larger, whereby the stopper body is allowed to move relative to said guide member toward the side at which the gap in the wedge-like space is larger.

2. A linear stopper as set forth in claim 1 , wherein the rolling element release means comprises an air expansion and contraction mechanism which can be expanded and contracted by supplying air pressure to the interior of the air expansion.

3. The linear stopper as set forth in claim 1 , wherein the rolling element release means comprises an operation part which has pressing plates arranged at the axially opposite end sides of the stopper body.

4. The linear stopper as set forth in claim 1 , wherein the rolling element release means comprises an operation part which has a lever arranged at the stopper body.

5. The linear stopper as set forth in claim 1 , wherein the rolling element release means comprises an operation part which has an operation ring fitted in a rotatable manner to an outer periphery of the stopper body.

6. A linear stopper as set forth in claim 1 , wherein the rolling element is a roller which is provided with a central concave surface portion of which a cross sectional configuration cut by a surface passing through a roller central axis is an arcuate concave shape and end convex surface portions which continue to the axially opposite sides of the central concave surface portion, and of which a cross sectional configuration cut by a surface passing through the roller central axis is an arcuate convex shape.

7. A linear stopper comprising: a one way stopper mechanism having a stopper body that is adapted to be detachably mounted on a guide member extending in a linear manner so as to guide an object for reciprocating movement, and has an inclined surface formed thereon, with a wedge-like space being constructed between the inclined surface and a surface of the guide member with a gap decreasing gradually toward one side of an extending direction of the guide member, rolling elements that are arranged in said wedge-like space so as to be rollable therein, and rolling element pressing means that presses the rolling elements in a direction to bite into the wedge-like space, so that the rolling elements are forced into pressure contact with the surface of the guide member and the inclined surface of the stopper body,

wherein the one-way stopper mechanism is provided to restrict the relative movement of the stopper body with respect to said guide member toward a side at which the gap in the wedge-like space is large, due to a biting action caused by the rolling contact of the rolling elements in said wedge-like space, and allows the relative movement of the stopper body with respect to said guide member toward a side at which the gap in the wedge-like space is small, due to the sliding contact of the rolling elements in said wedge-like space,

wherein said stopper body is provided with a reaction force support part that is in engagement with the guide member to support a reaction force acting on the inclined surface from the rolling elements upon biting thereof into the wedge-like space at the time of restriction of the relative movement of the stopper body;

said linear stepper further comprising:

at least one pair of the one-way stopper mechanisms in which the directions of wedge-like spaces with respect to the guide member are mutually opposite to each other, so that the relative movement of the stopper body with respect to the guide member is restrict to opposite sides of an extending direction of the guide member; and

a rolling element release means that serves to force the rolling elements arranged in the wedge-like space of at least one of the one-way stopper mechanisms to move in a direction in which the gap in the wedge-like space becomes larger, whereby the stopper body is allowed to move relative to said guide member toward the side at which the gap in the wedge-like space is larger.