Epson WF-4830/4820 Series Ink System Mechanism

— Epson WF 4830/4820 series Paper feed, paper loading mechanism, click here

Epson WF-4830/4820 Series Pump Mechanism

  • The pump mechanism sucks ink from the printhead at cleaning.
  • The drive force from the pump-drive compound gear is transmitted to the pump shaft via the timing plate. This timing plate allows the pump-drive compound gear to start rotating at the different timing from the pump shaft. After the PF motor rotates for a while, the pump unit starts its operation


  • When the IS motor rotates counter-clock wise as seen from the output-shaft side of the motor, the drive force via the pump-drive compound gear rotates the pump pulley to flatten the tube to suck the air (to generate negative pressure) inside the tube. When the IS motor rotates clock wise, the pump pulley does not flatten the tube, and the negative pressure is released.


  • Epson WF 4830/4820 series Pump mechanism contain: Pump spacer, Pump shaft, Pump pulley, Pump cam, Pump tube, Pump frame, Pump-drive compound gear. All these pump are connected to each other and they interact together.
  • Furthermore, this products incorporate two pumps, with improved suction performance.

Epson WF-4830/4820 Series Cap Mechanism

  • The direct acting type is employed in the capping mechanism, where the cap is moved up and down by the IS motor and the printhead is capped at the suction for cleaning.


  • Intermittent gear 2 rotates on drive power from the IS motor, and the cam surface on the intermittent gear 2 pushes the cap, moving it forward. At this time, the cap tab contacts the print head surface, guiding the print head on the cap.
  • Next, the wiper/cap-drive cam moves the cap drive lever, raising the cap, capping the print head.


  • The cam surface (in red) of the wiper/cap-drive cam raises and lowers the cap drive lever.

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Epson WF-4830/4820 Series Carriage Lock Mechanism


  • The tension of the compression spring at the bottom of the carriage lock moves up the carriage lock. When the carriage lock drive lever pushes the carriage lock downward, the carriage lock is released.
  • Since the carriage lock drive lever moves up and down together with the cap drive lever, the carriage lock also operates together with the movement of the cap. This means that the printhead nozzle surface is always capped when the carriage lock is set.

Epson WF-4830/4820 Series Wiper Mechanism


  • The rotation of the wiper/cap-drive cam drives the wiper mechanism.
  • After release, if the wiper cam rotates, the drive is conveyed to wiper gears 1, 2, and 3, and the wiper moves along the CR unit path.

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Epson WF-4830/4820 Series Venting Valve

  • Before capping, the valve lever interferes with the link lever, therefore the venting valve opens.


  • During the capping sequence, the valve lever shaft moves along the wiper/cap-drive cam slot, and the valve lever drops backwards. When this happens, the valve lever and link lever interference is removed, and the return force of the compression spring makes this slide to the 80-digit side, closing the venting valve.
  • Wiper/cap-drive cam (side of 0-digit side):

The rotation of the wiper/cap-drive cam moves the salient of the wiper drive lever along the cam surface of the wiper/cap-drive cam (red part) to move the valve open and close.

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