| 摘要 |
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.
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