| 摘要 |
PURPOSE:To enable a driven part and a driving part to be easily separated and combined and reduce the manufacturing cost of a printer head by using a screw hole on the driven part as a screw hole of screws for separation/ combination of the driven and driving parts. CONSTITUTION:In a driven part, a disc-shaped yoke 3 of magnetic substance and an annular ring member 4 of magnetic substance are screwed to each other with a screw 7. When separating the driving part 1 from the driving part 2, first any three pieces of screw 7 positioned to each other at 120 degrees' pitch from among those set at a prearranged interval on the external circumferential part of the yoke 3 should be removed. Next a screw 25 having a longer under-head length than the depth of a screw hole from which the removed screw is driven into each screw hole corresponding to the removed screw 7. This allows the tip of the screw 25 to contact a permanent magnet 13 on the driving part 2 side. In addition, the driven part 1 can be easily separated from the driving part 2, resisting the attractive force of the permanent magnet 13 by driving the screw 25. |
