Patent ID: 8727515

Claim:
A fluid ejector assembly, comprising: a bay for holding a detachable fluid container that includes a fluid outlet at a forward part of the container; a fluid ejector; a fluid inlet at a forward part of the bay through which fluid front the outlet of a fluid container installed in the bay may pass to the fluid ejector; and a stationary guide configured to block an improper installation of a fluid container into the bay without also blocking a proper installation of the fluid container into the bay; wherein the guide spans the bay from side to side over the inlet such that the guide blocks installation of a fluid container presented for installation with a heel-to-toe motion but does not block installation of a fluid container presented for installation with a toe-to-heel motion, where the forward part of the fluid container having the outlet characterizes the toe of the fluid container and a rearward part of the fluid container characterizes the heel of the fluid container; and wherein the guide spans the bay from side to side over the inlet such that the guide also blocks installation of a fluid container having a cap covering the outlet.