| 摘要 |
<p>PURPOSE:To move two loading members in opposite directions by providing a drive section to every loading member and arranging is projection so that one of a 1st or a 2nd absorbing part is arranged in-phase and the other with a phase shift by a half pitch. CONSTITUTION:In supplying a current to exciting coils 42, 43 so as to converge a magnetic flux to projections 33 shifted by 1/4 pitch in the mobile direction among four projections from two drive sections, the projections of loading members 9, 10 are moved to a position in complete opposition to the projections 33, the loading members 9, 10 are moved by 1/4 pitch in the mobile direction and in this state, any of the three projections other than the projection converged by the magnetic flux among the four projections of the drive sections 14, 15 is opposed in a phase deviated by 1/4 pitch in the mobile direction. Thus, the current is supplied to the exciting coils in the changeover timing where the magnetic flux is converged on one projection deviated by 1/4 pitch in the mobile direction at that point of time.</p> |
