Patent ID: 7350302
Filing Date: 2008-04-01
Classification: B23D,Y10T

Abstract:
1. A jigsaw comprising: a motor; an outer frame accommodating the motor; a base provided below the outer frame; a rotating section rotationally driven by the motor, the rotating section comprising; a rotary shaft extending in a front and back direction; a gear provided on the rotary shaft; a pin provided in an eccentric position of the gear; a cam provided on the rotary shaft; a plunger to which a saw blade having saw teeth is attached so as to intersect the base, the plunger engaging with the pin and reciprocating in an up-and-down direction according to an up-and-down motion of the pin; an intermediate member abutting on an outer peripheral surface of the cam and reciprocating in the up-and-down direction along the outer peripheral surface of the cam; a roller holder capable of swinging in the outer frame; the roller holder capable of abutting on the intermediate member and the saw blade, the roller holder being configured to move a tool at a tip thereof forward when the intermediate member moves downward, and the roller holder being configured to move the tool at the tip thereof when the intermediate member moves upward, wherein the outer peripheral surface of the cam has such a shape that an apex, a first region, and a second region are formed, wherein the apex has a greatest distance from a rotational axis of the rotating section, wherein the first region located on the side of the apex opposite to the direction of rotation of the cam has an increasing distance from the rotational axis with the rotation thereof, and wherein the second region located on the side of the apex in the direction of rotation has a decreasing distance from the rotational axis of the rotating section with the rotation thereof.