Conveyance device
A conveyance device includes a fixed base, a turning body, two or more servomotors, a conveyance arm, and two or more speed reducers. The turning body includes a large gear serving as an external gear. Each of the speed reducers includes a housing integrated with the fixed base, a planetary carrier rotatably supported inside the housing, an internal gear provided inside the housing, a sun gear connected to an output shaft of one of the servomotors, a plurality of planetary gears arranged around the sun gear and rotatably supported by the planetary carrier, and an output gear that rotates integrally with the planetary carrier. The planetary gear meshes with the sun gear and meshes with the internal gear. The output gear has a smaller diameter than a diameter of the large gear and meshes with the large gear outside the large gear.
1 . A conveyance device comprising:
a fixed base;
a turning body supported by the fixed base via a bearing;
two or more servomotors fixed to the fixed base and configured to rotate the turning body relative to the fixed base;
a conveyance arm configured to be able to convey a workpiece by turning in conjunction with the turning body; and
two or more speed reducers fixed to the fixed base and respectively connected to the two or more servomotors, wherein
the turning body includes a large gear serving as an external gear,
each of the speed reducers includes:
a housing integrated with the fixed base;
a planetary carrier rotatably supported inside the housing;
an internal gear provided inside the housing;
a sun gear connected to an output shaft of one of the servomotors;
a plurality of planetary gears arranged around the sun gear and rotatably supported by the planetary carrier; and
an output gear configured to rotate integrally with the planetary carrier;
wherein each planetary gear meshes with the respective sun gear and meshes with the respective internal gear, and
each output gear has a smaller diameter than a diameter of the large gear and meshes with the large gear outside the large gear.
2 . The conveyance device according to claim 1 , wherein
the two or more servomotors include a first servomotor and a second servomotor,
the output gears include a first output gear rotated by the first servomotor and a second output gear rotated by the second servomotor,
the large gear rotates around a first rotation axis, and
the first output gear is located at a position allowing the first output gear to face the second output gear with the first rotation axis interposed between the first output gear and the second output gear.
3 . The conveyance device according to claim 1 , wherein the workpiece is a metal plate for press working.
4 . The conveyance device according to claim 1 , wherein the workpiece is a product that has been subjected to press working.