| 主权项 |
1. A pressure adjusting device comprising:
a housing that includes a cylinder; a piston that moves within the cylinder in an axial direction; a pulse motor fixed to the housing and including a rotation shaft that is connected to the piston so that a rotational movement of the rotation shaft translates into a translational movement in the axial direction of the piston; and an origin point switch provided on a surface of the cylinder, the origin point switch being actuated by movement of the piston in the cylinder in the axial direction, wherein the origin point switch includes:
a first contact member that is formed of a conductor and includes a contact point at a fixed position,a positioning member that is interposed between the pulse motor and the cylinder, and has an open portion that exposes the contact point of the first contact member, anda second contact member that is formed of an elastically deformable conductor and includes a fixed end fixed to the positioning member on one end side and a movable contact point elastically held, when the piston is in an initial position, in a position separated from and facing the contact point of the first contact member, wherein the piston presses the movable contact point in a direction to abut against the contact point of the first contact member when the piston moves from a position other than the initial position to the initial position so that the movable contact point electrically contacts the contact point of the first contact member. |
