Pump for printing machine

摘要

In a pump intermittently rotated and controlled by a motor, the motor, etc. rise in temperature and ink supply is unstable when an operation of the pump is stopped in a magnetizing state. Therefore, the invention resides in a pump for a printing machine characterized in that the pump has a base; a cylinder having a suction hole and a discharge hole opened in positions different from each other in phase on the inner circumferential face of a main hole; a plunger fitted to an opening side of the main hole of the cylinder so as to be axially moved and rotated from an end tip of the main hole and closing the suction hole or/and the discharge hole; a motor attached to the base such that a rotating central line of a rotating shaft crosses that of the plunger at a predetermined crossing angle; a transmission mechanism constructed by an arm and a connection member; and retrogression preventing means for arranging the plunger temporarily stopped at a discharging stroke during an operation of the pump intermittently operated by the motor such that the plunger is not retreated and not angularly displaced in a direction reverse to a predetermined operating direction.