MOTOR-DRIVEN RECIPROCATING DEVICE

To provide a motor-driven reciprocating device in which a problem does not occur even if force moving a movable body in the same direction is further applied when the movable body reaches a movable terminal position.SOLUTION: A motor-driven reciprocating device 1-1 is equipped with a rotary shaft 40 that has a spiral groove 41 and is connected to a motor, and a movable body 60 that engages with the spiral groove 41 and reciprocates in a rotation axis direction with rotations of the rotary shaft 40. The movable body 60 is equipped with a groove engaging member 91 that engages with the spiral groove 41 of the rotary shaft 40 and moves in the rotation axis direction by rotations of the rotary shaft 40, a movable main body 61 that holds the groove engaging member 91 so as to move between a position engaging with the spiral groove 41 and a position separated from it and moves in the rotation axis direction integrally with the groove engaging member 91, and spring means 111 that separates the groove engaging member 91 from the spiral groove 41 to idle the rotary shaft 40 when force stopping movement is applied to the groove engaging member 91 moving in the rotation axis direction.SELECTED DRAWING: Figure 1 【課題】移動体が移動できる終端位置まで到達した際にさらに同一方向に移動体を移動させようとする力が印加されても不具合が生じないモータ駆動式往復移動装置を提供する。【解決手段】螺旋溝４１を有しモータに接続される回転軸４０と、螺旋溝４１に係合し回転軸４０の回転に伴って回転軸線方向に往復移動する移動体６０とを具備するモータ駆動式往復移動装置１－１である。移動体６０は、回転軸４０の螺旋溝４１に係合し回転軸４０の回転によって回転軸線方向に移動する溝係合部材９１と、溝係合部材９１を螺旋溝４１に係合する位置と離脱する位置とに移動自在に保持すると共に溝係合部材９１と一体に回転軸線方向に移動する移動体本体６１と、回転軸線方向に移動する溝係合部材９１に移動を停止させる力が加わった際に溝係合部材９１を螺旋溝４１から離脱させて回転軸４０を空回りさせる弾発手段１１１とを具備する。【選択図】図１