Rocking table
A rocking table includes a base portion, a linear motion mechanism including a rail attached to the base portion and a slider relatively movably attached to the rail, a driving source causing the slider to perform a linear reciprocating motion, a first support portion attached to the slider and performing a linear reciprocating motion together with the slider, a first rolling bearing attached to the first support portion, a table portion capable of performing a rocking motion with power transmitted from the driving source, a second support portion supporting the table portion, a second rolling bearing attached to the second support portion, and an eccentric shaft including a first shaft portion and a second shaft portion arranged eccentrically with respect to the first shaft portion, the first shaft portion being supported by the first rolling bearing, the second shaft portion being supported by the second rolling bearing.
1 . A rocking table comprising:
a base portion;
a linear motion mechanism including a rail attached to the base portion and a slider relatively movably attached to the rail;
a driving source causing the slider to perform a linear reciprocating motion;
a first support portion attached to the slider and performing a linear reciprocating motion together with the slider;
a first rolling bearing attached to the first support portion;
a table portion capable of performing a rocking motion with power transmitted from the driving source;
a second support portion supporting the table portion;
a second rolling bearing attached to the second support portion; and
an eccentric shaft including a first shaft portion and a second shaft portion arranged eccentrically with respect to the first shaft portion, the first shaft portion being supported by the first rolling bearing, the second shaft portion being supported by the second rolling bearing.
2 . The rocking table according to claim 1 , wherein the linear motion mechanism includes a linear motion guide unit.
3 . The rocking table according to claim 2 , wherein at least one of the first rolling bearing and the second rolling bearing includes an angular bearing.
4 . The rocking table according to claim 2 , wherein the driving source includes
a ball screw having a ball screw nut attached to the first support portion and a screw shaft, and
a motor operable to rotate the screw shaft.
5 . The rocking table according to claim 2 , wherein in the case where the table portion is horizontal as viewed in a horizontal direction, a direction in which a virtual line segment connecting a center of the first shaft portion and a center of the second shaft portion extends is horizontal.
6 . The rocking table according to claim 2 , wherein a plurality of the sliders are provided.
7 . The rocking table according to claim 2 , wherein
the table portion includes a sliding portion having a sliding surface composed of a curved surface, and
the base portion includes a guide portion that guides the table portion, the guide portion having a guide surface that is composed of a curved surface and is in contact with the sliding surface.
8 . The rocking table according to claim 7 , wherein a pair of the guide portions are provided to sandwich the rail therebetween.
9 . The rocking table according to claim 1 , wherein at least one of the first rolling bearing and the second rolling bearing includes an angular bearing.
10 . The rocking table according to claim 1 , wherein the driving source includes
a ball screw having a ball screw nut attached to the first support portion and a screw shaft, and
a motor operable to rotate the screw shaft.
11 . The rocking table according to claim 1 , wherein in the case where the table portion is horizontal as viewed in a horizontal direction, a direction in which a virtual line segment connecting a center of the first shaft portion and a center of the second shaft portion extends is horizontal.
12 . The rocking table according to claim 1 , wherein a plurality of the sliders are provided.
13 . The rocking table according to claim 1 , wherein
the table portion includes a sliding portion having a sliding surface composed of a curved surface, and
the base portion includes a guide portion that guides the table portion, the guide portion having a guide surface that is composed of a curved surface and is in contact with the sliding surface.
14 . The rocking table according to claim 13 , wherein a pair of the guide portions are provided to sandwich the rail therebetween.