Abstract: In an example, an apparatus is described that includes a non-resistive heat source, a thermally conductive face, and a temperature detector. The thermally conductive face has a controlled long-wave infrared emissivity and is in thermal contact with the non-resistive heat source. The temperature detector is positioned to detect a temperature of the thermally conductive face.

Abstract: Some examples include a thermal imaging assembly, comprising a thermal sensor having a field of view and optics, an emitting source to validate the optics in the field of view, an emitter storage to selectively house the emitting source outside of the field of view, and a carrier to move the emitting source between the emitter storage and the field of view.

Abstract: In an example, an apparatus is described that includes a non-resistive heat source, a thermally conductive face, and a temperature detector. The thermally conductive face has a controlled long-wave infrared emissivity and is in thermal contact with the non-resistive heat source. The temperature detector is positioned to detect a temperature of the thermally conductive face.

Abstract: Some examples include a thermal imaging assembly, comprising a thermal imaging device including a thermal sensor, a transistor to generate heat, a thermal jacket forming a cavity to house the thermal imaging device, the thermal jacket forming a space around the thermal imaging device, the thermal jacket thermally coupled to the transistor to transmit heat generated by the transistor to the cavity, and an insulative shell disposed around the thermal jacket to maintain a temperature of the thermal imaging device within the insulative shell.

Abstract: An example system includes an imaging device and an enclosure substantially separating the imaging device from an outside environment. The enclosure includes an air intake to force air into the enclosure and an aperture to allow air to escape the enclosure. The air intake and the aperture maintain an air pressure level in the enclosure greater than an air pressure of the outside environment.

Abstract: In some examples, a controller is to receive a measurement from a sensor in an enclosure, and use the measurement and a baseline value to represent a condition of an airflow flowing through a filter that removes particulates from an incoming airflow into the enclosure. Based on the measurement and the baseline value, the controller is to selectively adjust a setting of an airflow generator that causes the incoming airflow through an inlet into the enclosure, or indicate that the filter is to be replaced.

Abstract: Some examples include a media level state indicator of an image forming apparatus. The media level state indicator including a gear assembly of interconnected gears including a first gear, a second gear, and a cam fixedly disposed on the first gear, the second gear coupled to a media lift system and rotatable with a shaft of the media lift system, the first gear and the cam rotatably coupled to the second gear, a cam follower to selectively contact the cam, the cam follower moveable in response to contacting rotational movement of the cam, and a signal device coupled to the cam follower, the signal device having a first media level state and a second media level state, the signal device to move between the first media level state and the second media level state as the media lift system changes a position of a lift plate.

Abstract: End effectors and systems including end effectors configured to provide colorimetric indicia of a wear state of the end effector are described. In one embodiment, the end effector includes: a base portion coupleable to a motor; a chamber including an optically translucent window and a chamber interior; and a flowable material disposed in the chamber interior and having a color. The end effector is configured to provide colorimetric indicia of a wear state of the end effector based at least in part on mixing of the flowable material.

Abstract: End effectors and systems including end effectors configured to provide visible indicia of a wear state of the end effectors are described.

Abstract: End effectors and systems including end effectors configured to provide audible and/or haptic indicia of fatigue failure of springs disposed in the end effectors are described.

Abstract: Some examples include a media level state indicator of an image forming apparatus. The media level state indicator including a gear assembly of interconnected gears including a first gear, a second gear, and a cam fixedly disposed on the first gear, the second gear coupled to a media lift system and rotatable with a shaft of the media lift system, the first gear and the cam rotatably coupled to the second gear, a cam follower to selectively contact the cam, the cam follower moveable in response to contacting rotational movement of the cam, and a signal device coupled to the cam follower, the signal device having a first media level state and a second media level state, the signal device to move between the first media level state and the second media level state as the media lift system changes a position of a lift plate.