| 摘要 |
PURPOSE:To suppress the invasion of dust or the like into a rolling part and a sliding part in a bearing and to make it possible to smoothly move a carriage even in an environment polluted by much dust or the like by using dust preventing covers. CONSTITUTION:The dust preventing covers 23, 24 are laterally symmetrically arranged on rotors 13a to 13e, guide members 5, 6, magnets 7, 8, and yorks 9, 10. Since the guide members 5, 6, etc., are covered with the covers 23, 24, contact faces between the rotors 13a to 13e and the guide members 5, 6 can also be prevented from the adhesion of dust or the like in addition to the sliding parts between the rotors 13a to 13e and their center axes and the carriage can be smoothly moved. Since movable parts are not covered with the covers 23, 24, the weight of the carriage unit is reduced and the speed of the carriage 2 is also increased. |
