Patent ID: 8099873

Claim:
An electric-powered cutting machine, comprising: a housing; a plunger held by the housing and protruding outward therefrom, the plunger being driven to reciprocate; an operation member rotatably mounted on the housing; and a blade holding mechanism disposed at a tip end portion of the plunger, the blade holding mechanism detachably attaching a blade to the plunger, the blade comprising a pair of projections, wherein the blade holding mechanism comprises a blade receiving portion including an engaging portion that engages with the projections of the blade, wherein the operation member comprises an operation portion and an abutting portion, wherein the blade holding mechanism comprises a rotating member and a pressing member that urges the rotating member toward a side of the blade, wherein the abutting portion abuts against the rotating member when the operating member rotates in a direction away from an initial position, the initial position being at a rotation end point, thereby causing the rotating member to rotate against a biasing force of the pressing member, wherein the blade is detachably attached to the plunger by a rotation of the rotating member, wherein the abutting portion and the operation portion are disposed at different ends of the operation member with respect to the rotating fulcrum, wherein the rotating member comprises: a rotation center around which the rotating member is rotated; a first end being urged by the pressing member to press the blade; and a second end that is abutted by the abutting portion, wherein, when the operation member is rotated in the direction away from the initial position, the rotating member is rotated through a contact between the abutting portion and the second end so that a pressing force applied from the first end to the blade is released, thereby detaching the blade from the plunger, wherein, when the blade is attached to the blade receiving portion of the blade holding mechanism, the blade is clamped by the blade receiving portion and the first end of the rotating member, and the projections of the blade are engaged with the engaging portion of the blade receiving portion, thereby preventing the blade from moving downward, wherein, when the operation member is in the initial position, the abutting portion, the rotating fulcrum, and the second end are positioned at one side of a line extending along a side surface of the blade, and the operation portion is positioned at another side of the line, and wherein, when viewed from the longitudinal direction of the blade, the distance from the operation portion to the rotating fulcrum is more than two times of the distance from the abutting portion to the rotating fulcrum.