Leakproof pump for use in an inking mechanism of a rotary printing press
OwnerYoshinori Uerainventor
Life of this patent
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Abstract
A plurality of pump units are juxtaposed for conjointly metering ink to an offset printing press. Each pump unit has a piston slidably received in a cylinder having formed therein a suction port and a discharge port at circumferential spacings. Conventionally pressure-tightly closed at one end, the cylinder has the piston projecting from the other end thereof. The projecting end of the piston is coupled to a drive motor via a drive linkage such that the piston both rotates and linearly reciprocates with each complete revolution of the motor for drawing ink into the cylinder through the suction port and forcing it out through the discharge port. A cylinder end seal is provided for sealing said other end of the cylinder against the leakage of the printing ink.
Claims10
A pump capable of metering a fluid such as printing ink, comprising:
- (a) pump body means defining a bore which is pressure-tightly closed at a first end thereof, together with a suction port and a discharge port which are both open to the bore in preassigned different angular positions thereon;
- (b) a piston slidably received in the bore in the pump body means for both rotation and linear reciprocation relative to the same and having one end projecting from a second end of the bore, the piston being capable of blocking both suction port and discharge port and alternately placing the same in communication with the bore during each complete revolution thereof;
- (c) a drive motor mounted to the pump body means and having a drive shaft rotatable about an axis intersecting the axis of rotation of the piston at a prescribed angle;
- (d) a drive linkage connecting the drive shaft of the drive motor to the piston so as to cause joint rotation and linear reciprocation of the latter in response to the rotation of the former;
- and
- (e) end seal means sealing the second end of the bore against the leakage of the fluid from between the pump body means and the piston.
Dependencies are inferred from the claim text.