Epson WF-7820, WF-7830, WF-7840, EC-C7000 Series Service Manual Page 41-60

EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A Operating Principles Ink System Mechanism 41 Confidential 1.4.3 Operation of Each Mechanism 1.4.3.1 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 pump 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 pump motor rotates clock wise, the pump pulley does not flatten the tube, and the negative pressure is released. Figure 1-40. Pump Mechanism (1) Figure 1-41. Structure of the pump unit Pump motor counter-clock wise rotation (suction) Rotates flattening the tube. Rotates without flattening the tube. Pump motor clock wise rotation (release) Pump-drive compound gear Timing plate Pump pulley Pump cam Pump frame Pump spring (x2) Pump tube Pump spacer Pump shaft Pump Pulley Pump cam Pump frame Pump tube Pump shaft
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Epson WF-7820 Series Service Manual Page 41-60
Epson WF-7830 Series Service Manual Page 41-60
Epson WF-7840 Series Service Manual Page 41-60
Epson EC-C7000 Series Service Manual Page 41-60