Print head lock

An apparatus, comprising:

• a print head assembly (PHA) translatable from a printing location to a non-printing location;
• a cap sled assembly engaged with the PHA, the cap sled assembly comprising a cap to seal the PHA;
• a swing-arm rotationally engaged with a gear hub of a gear;
• a coil spring to apply a radial clamping force between the swing-arm and the gear hub, wherein torque is frictionally coupled from the gear hub to the swing-arm, wherein the swing-arm is operable by the gear to engage a hook in the cap sled assembly, wherein translation of the PHA and the cap sled assembly is prevented.

A non-transitory computer-readable storage medium encoded with instructions executable by a processor of a computing system, the computer-readable storage medium comprising instructions to:

• translate a print head assembly (PHA) to a non-printing location;
• engage the PHA with a cap sled assembly in the non-printing location;
• detect the engagement of the PHA with the cap sled assembly;
• and
• control a motor-driven gear chain to lock the PHA and cap sled assembly at the non-printing location,
• wherein the motor-driven gear chain comprises a motor-driven gear, an idler gear coupled with the motor-driven gear, and a swing-arm frictionally coupled with a hub of the idler gear to engage a hook in the cap sled assembly.