Patent ID: 6719542
Filing Date: 2004-04-13
Classification: B41F,F04B

Abstract:
A pump for a printing press comprising:a cylinder having a main bore which extends along an axis of the cylinder and is closed at one end, and intake and discharge holes which are opened to an inner surface of the cylinder at different circumferential positions; a plunger fitted into the main bore to be rotatable about the axis and reciprocatable along the axis, the plunger closing the intake and discharge holes simultaneously at certain angular positions and closing only one of the intake and discharge holes at other angular positions; a motor for rotating and reciprocating the plunger, the motor being disposed in such a manner that an output shaft of the motor faces a base end portion of the plunger projecting from an open end of the cylinder, that a space is present between the base end portion and the output shaft, and that a rotational axis of the output shaft is radially offset, by a certain eccentricity distance, from a rotational axis of the plunger and forms an angle with the rotational axis of the plunger; and a transmission mechanism disposed in the space and including a first member fixed to the base end portion of the plunger, and a second member fixed to the output shaft of the motor, the first and second members being connected with each other at an eccentric position in such manner that the first member and the second member can move relative to each other in the radial direction of the output shaft or the plunger and can change an intersecting angle therebetween.