CAM DEVICE, AUTOMATIC CHEMICAL FEED DEVICE WITH THE CAM DEVICE, AND TRAY MOUNTING STRUCTURE OF THE AUTOMATIC CHEMICAL FEED DEVICE

摘要

An automatic chemical feed device automatically feeding chemical contained in a chemical container with a manual pump mechanism by detecting the operating action of a user with a sensor to operate a pump drive mechanism, the pump drive mechanism comprising a cam device having a cam plate driven by a motor and a cam follower member performing reciprocating linear motion in conjunction with the rotating motion of the cam plate, wherein a specified portion at the peripheral edge of the cam plate is formed with a spiral curve specified by an equation tau = a(4x) theta tau is radius vector, theta is declination, and a is constant) in two-dimensional polar coordinates having an origin at the rotating center of the cam plate, whereby, because such a cam device capable of maintaining the moving speed of the linear motion at a constant when the rotating motion is converted to the linear motion is assembled, the status of delivery of chemical during the period of chemical delivery can be uniformed and stabilized.