In a powered parts feeder, what device indicates that there are no more parts left to feed?

In a powered parts feeder, what device indicates that there are no more parts left to feed?

• A. Sensor
• B. Push button
• C. Vision system
• D. Proximity switch

Answer: (A)

Sensing the presence of parts to determine when the supply is exhausted is the key idea. A sensor placed to monitor the hopper outlet or feed path provides a simple, automatic indication of emptiness: when parts are no longer detected, the sensor outputs a signal that can stop the feeder or trigger an alert. This direct feedback from a sensor is reliable and fast, making it a straightforward way to know there are no more parts to feed. A push button is manual, so it doesn’t automatically tell you when the parts are gone. A vision system could also detect emptiness by checking whether parts are present, but it adds complexity and cost compared to a basic sensor. A proximity switch detects the presence of nearby metal objects and isn’t inherently suited to reliably indicate an empty hopper, especially with nonmetallic parts or varying part sizes.

Sensing the presence of parts to determine when the supply is exhausted is the key idea. A sensor placed to monitor the hopper outlet or feed path provides a simple, automatic indication of emptiness: when parts are no longer detected, the sensor outputs a signal that can stop the feeder or trigger an alert. This direct feedback from a sensor is reliable and fast, making it a straightforward way to know there are no more parts to feed.

A push button is manual, so it doesn’t automatically tell you when the parts are gone. A vision system could also detect emptiness by checking whether parts are present, but it adds complexity and cost compared to a basic sensor. A proximity switch detects the presence of nearby metal objects and isn’t inherently suited to reliably indicate an empty hopper, especially with nonmetallic parts or varying part sizes.