Power transmission device

摘要

A power transmission device which is free from a possibility of breakage of a driving member is provided. A stepping motor (driving member) 61a configured to be driven on the basis of a command signal from a controller 70, a lead screw portion 61c configured to be rotationally driven in association with the drive of the stepping motor 61a, and a power transmitting member 65 configured to move along an axial direction X of the lead screw portion 61c in accordance with the rotation of the lead screw portion 61c and transmit a power to a power transmitted member 42e are provided, and the controller 70 is configured to control the output of the command signal to the stepping motor 61a to be stopped when the power transmitting member 65 is not moved along the axial direction X.

主权项

1. A power transmission device comprising:
a driving member configured to be driven on the basis of a command signal from a controller; a lead screw portion configured to be rotationally driven in association with the drive of the driving member; and a power transmitting member configured to move along an axial direction of the lead screw portion in accordance with the rotation of the lead screw portion to transmit the power to a power transmitted member, characterized in that:
the controller is configured to control the output of the command signal to the driving member to be stopped so that electric current is not supplied to an exciting coil of the driving member when the power transmitting member is not moved along the axial direction,the power transmitting member includes a pair of projecting portions that each come into point contact with the power transmitted member so as to sandwich the power transmitted member,the power transmitted member rotates about an axis of rotation,the power transmitting member transmits power through the point contact to the power transmitted member to rotate the power transmitted member about the axis of rotation,the power transmitting member is formed with an insertion portion configured to allow insertion of a guide shaft which extends substantially parallel to the lead screw portion, anda movement of the power transmitting member along the axial direction of the lead screw portion causes a holder connected to the guide shaft to rotate about an axis of rotation.