| 摘要 |
PURPOSE:To enable reverse movement of a pressing bar and to prevent dripping of a viscous material due to residual pressure by separating from a motor the pressing bar interlocking with an open operation of a switch. CONSTITUTION:When a switch lever 20 is pulled, a clutch pin 56 is moved upward by a clutch spring 57, and rotation of an internal gear 52 is stopped when the clutch pin 56 meshes with a recess 55. In this way, the output of the motor 7 is transmitted to the next stage. On one hand, when a finger is released from the switch lever 20, a projection 26 for meshing of the switch lever 20 which is returned by a return spring 25 pushes down the clutch pin 56 to liberate the internal gear 52; the group of four-stage planetary mechanism is separated and the motor 7 is separated from the pressing bar 3. As a result, the pressing bar 3 which has pressed the plunger 12 is moved backward a little by the reaction. Dripping of the viscous material from a nozzle 11 due to a residual pressure is prevented.
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