| 摘要 |
PURPOSE:To reduce the number of parts and provide a higher fashionability, by driving a pointer directly with a permanent magnet from outside a closed case to set time. CONSTITUTION:A part mostly made up of non-magnetic material is sealed into a closed housing 2. The rotation of a pulse motor 5 is transmitted to a second pointer shaft 12 and further to a minute pointer gear 18 with a gear. The gear 18 is pivotted on a minute pointer shaft 20 and engaged detachably with a drive piece 22 made up of a magnetic material through a clutch 21. Therefore, as a permanent magnet 26 approaches from outside the housing 2, the drive piece 22 is moved on the shaft 20 being attracted by a magnetic ring 25 to be released from the engagement with the gear 18, facilitating the movement of a minute pointer. The drive piece 22 is allowed to follow a magnet 16 with a slight clearance between the ring 25 and the piece 22 and drives the shaft 20 and the minute pointer 27 to set time. This provides a smaller number of parts and a higher fashionability. |
