Group 3 - hpdeskjet 960c Printer

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Contents

General Function

The function of the printer is to move a piece of paper through as it dispenses ink onto the paper in a specified arrangment.


Printer 001.jpg


Human Machine Interface (HMI)

This section contains components that interact with humans.

  • Control buttons/panel
    • Operation - power - press once and printer turns on, press again and turns off
    • Operation - paper - light shows that paper is needed, button pressed once, after paper refilled, to finish print job
    • Operation - cancel - press once to cancel print job


Controlbuttons.jpg


  • Computer (cord from computer to printer)
    • Operation - person sends job to printer using computer program


Sensing

This section contains components that interact with the world.

  • Optical encoder
    • Operation - uses some sort of counting method to indicate if paper is not there.


Optical encoder copy.jpg

Circled section identifies the encoder and sensor.


  • Cartridge detector
    • Operation - indicates if ink cartridges are not inserted.


Cartridge detector.jpg

Circled section identifies the detector.


  • Ink detector
    • Operation - indicates if ink cartridges are low of ink.


Movements

There are a lot of moving parts in a printer.


Printer inside.jpg


  • Flaps on either side move up and down to help pick up the inserted paper.


Flaps.jpg

The black part circled is one flap in the "up" position.


  • Cartidges move along rod by the help of a belt that is turned by a motor.


Belt.jpg

Here is the back of the cartridge holder, showing the belt running through it.


  • Rods and wheels rotate to move the paper.


Paper reel.jpg

Here is the system of parts that contribute to the movement of the paper.


  • Cartidge holder moves in and out of position depending on whether it is in use or not.


Cartridge stored position.jpg

Circled is the belt and the rod that help to move the cartridge holder. The cartridge holder is in the "stored" position when it is all the way over to this side.


Power Supply

  • 100-240 Volt DC Motors (3) (50/60 Hz, 0.7 A)
    • Needs to provide the needed torque to move the belt to translate the cartridges.

Belt motor.jpg

The motor that moves the belt is circled.


    • Needs to provide the needed torque to translate the cartidges in and out of position.

Cartridge motor.jpg

The motor that assists the movement of the cartridge holder.


    • Needs to provide the needed torque to move the flaps and wheels to move the paper.

Motor paper.jpg

The motor that assists the movement of the paper is circled.


  • Electric motors tend to provde high angular velocitiers with relatively low torques.


Power Conversion

  • Gear transmission.


Gear transmission.jpg

Circled areas show the gear reductions.


  • Increases torque and decreases speed.


Motion Conversion

  • Needs to convert a rotary input from the motor to a linear output of the cartidge holder.


Intelligence

  • Needs to monitor inputs from humans and the outside world and to control operations accordingly.
  • Microprocessor and accompanying circuitry.
  • Multiple circuit boards.
    • Communicate between computer and printer.


Printer 007.jpg

Circuit board that goes to the control panel/buttons.


Printer 093.jpg

Circuit board that goes with the optical encoder.


Printer 066.jpg

Circuit board that goes with the ink cartridges that deal with movement and disposal.


Printer 044.jpg

Main circuit board.


    • Communicate between power and printer.


Printer 026.jpg

Circuit board that goes to power supply.