To provide a unidirectional gear which can more readily restore to normal rotation, especially, a gear for watches.
This unidirectional gear includes toothed drive gear (1) and toothed driven gear (3), in which the rear face (9) on a gear tooth (2) of the drive gear (1) contains a depression (10), defining both a 1st plane (11) and a 2nd plane (12) of the rear face (9) crossing an edge (13). The 2nd plane (12) is located in between the 1st plane (11) and the vertex (15) of the gear tooth (2) on the 1st plane (11); while the vertex (16) of a gear tooth (4) on the toothed driven gear (3) is the edge defined by a 3rd plane (17) and a 4th plane (18). At the blocking location of the gear, one tooth (4b) of the toothed driven gear (3) is set by the vertex (16) of the gear tooth (4b) on the toothed driven gear (3), brought into contact with the 1st plane (11) of one tooth (2b) on the drive gear (1), at the only contact point which practically matches with the edge (13) of the depression (10).
| JPS58109879 | ELECTRONIC WATCH |
| JP2016133495 | METHOD OF MANUFACTURING TIMEPIECE COMPONENT AND TIMEPIECE COMPONENT |
| JPS5340266U | 1978-04-07 | |||
| JPS52155877U | 1977-11-26 | |||
| JPS52155877U | 1977-11-26 |
| DE10350934A1 | 2004-05-27 | |||
| FR1157102A | 1958-05-27 | |||
| DE10350934A1 | 2004-05-27 | |||
| FR1157102A | 1958-05-27 |
Fumiaki Otsuka
Shishido Kaichi
Disciple Maru Ken
Ino Sato