Teijin Seiki Co., Ltd.

Hiroyuki Takenaka

Masanori Hirai

Kiyoshi Ando

Tsuyoshi Nachi

Hidekazu Yokoi

Tomohiro Kiriyama

Tuyoshi Nachi

Katumi Mori

Herein disclosed is a motion transforming apparatus, comprising first and second rotation shafts each formed with crank shaft portions, a plate assembly constituted by rotation plates each formed with teeth and cranked through bores respectively having the crank shaft portions of the rotation shafts received therein, a toothed rail having teeth, and a plate assembly housing relatively movable along the toothed rail, wherein the first rotation shaft is driven to rotate the rotation plates, and each of the rotation plates has an untoothed portion connected to the toothed portion of each rotation plate to be spaced from the toothed portion of the toothed rail and to have the toothed portions of the rotation plates closer to the second rotation shaft than the first rotation shaft. The toothed portion of each rotation plate is thus deviated from the second rotation shaft and held in mesh with the toothed rail in the vicinity of the first rotation shaft, thereby reducing a moment which tends to rotate the plate assembly housing around the first rotation shaft so as to lift up the leading end of the plate assembly housing.

Motion transforming apparatus

A linear motion apparatus is comprised of: a toothed rail (40); a linearly driving mechanism section (50) having a plurality of swinging plates (53), crankshafts (54, 55), and a casing (51); and guiding means for guiding the casing (51) relatively movably with respect to the toothed rail (40). The casing (51) includes: a pair of side portions (61, 62) which are guided by the guiding means on both sides, in a tooth width direction, of the rail (40); a pair of end plate portions (63, 64) which are located on opposite sides, as viewed in a longitudinal direction of the rail (40), of the swinging plates (53) and connect opposite end portions of the pair of side plate portions (61, 62); and a coupling member (521) which is located between the plurality of crankshafts (54, 55) as viewed in the longitudinal direction of the rail and couple intermediate portions of the pair of side plate portions (61, 62). The coupling member (521) is preferably passed through the swinging plates (53). The linear motion apparatus is compact and low-cost, and capable of maintaining a stable state of meshing between swinging plates and a toothed rail even if a compact casing is adopted.

Linear motion apparatus

A motion transforming mechanism comprises a plate assembly and a toothed rail. The plate assembly is constituted by at least three rotation plates having a common rotation axis and each having a plurality of teeth, the rotation plates being respectively formed with cranked through bores. The toothed rail is formed with a plurality of teeth held in mesh with the teeth of rotation plates. The motion transforming mechanism further comprises a drive motor assembly constituted by a rotor unit rotatably received in the cranked through bores and a stator unit accommodated in the rotor unit. The rotation plates are rotated with respect to their common rotation axis by the rotation of the rotor unit with respect to stator unit. The motion transforming mechanism thus constructed requires no external electric motor and accordingly is able to be more easily assembled with various systems.

Motion transforming mechanism

A rotary motion to longitudinal motion converting mechanism comprising a passive rack with a plurality of teeth, a plurality of active racks respectively having a plurality of teeth having the same pitch as that of the teeth of the passive rack and meshing with the passive rack, and a plurailty of rotatable crankshafts respectively having eccentric circular portions different in phase from one another and respectively having the active racks supported on the eccentric circular portions in such a manner that the passive rack is moved in its longitudinal direction through the active racks by rotary motions of the plurality of rotatable crankshafts.

Growing community of inventors

Gifu, Japan

Hiroyuki Takenaka