Atypical powered parts feeder includes a single solenoid DCV, a _________ to dispense parts, and a chute to hold the parts.

• A. Rotary vane motor
• B. Stepper motor
• C. Pneumatic gripper
• D. Spring return cylinder

Answer: (D)

Dispensing action in a compact feeder is achieved with a pneumatic actuator driven by a solenoid valve. A spring return cylinder provides a simple single-acting motion: when the solenoid directs air to extend the piston, it pushes a part out through the chute; once the air supply is cut, the spring automatically pulls the piston back to its starting position for the next cycle. This setup is fast, straightforward, and cost-effective, which fits the description of an atypical feeder using a single solenoid valve and a dispensing stroke.

The other options would introduce unnecessary complexity or an incorrect function: a rotary vane motor or a stepper motor would rotate rather than provide a straight, push-out dispense, and a pneumatic gripper is designed to grasp, not push out a part.