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HP (Hewlett-Packard) 1200C manual

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  • Page 1

    72 February 1994 Hewlett-Packard Journal Media Path for a Small, Low-Cost, Color Thermal Inkjet Printer The DeskJet 1200C media path is heated for media independence, requiring development of a new grit drive roller and pinch wheel combination. A new stepper motor was developed to attain the target speed and accuracy . Media flatteners and precise [...]

  • Page 2

    February 1994 Hewlett-Packard Journal 73 • Move media very quickly through the print area while main- taining high placement accuracy for good graphics print quality . • Keep the price low . The parts of the media path (Fig. 1) that drive and meter the media include the stepper motor , the drive pinions, the drive gears, the antibacklash device[...]

  • Page 3

    74 February 1994 Hewlett-Packard Journal Fig. 3. Heated media path. Preheater Writing Zone Main Heater fed up into the main heater and the writing zone, it is wrapped around the preheater . This contact allows the pre- heater to precondition the media so that when the media reaches the writing zone it is much more dimensionally stable. Much of the [...]

  • Page 4

    February 1994 Hewlett-Packard Journal 75 Stepper Motor Simulation Model The model used to simulate a permanent magnet stepper motor for the simulations described in the accompanying article originated from a classic control systems point of view . The model includes simple position and velocity feedback control algorithms. Fig. 1 is a block diagram[...]

  • Page 5

    76 February 1994 Hewlett-Packard Journal Fig. 2. Simulated velocity profile of a failing motor (8-ohm). –200 0 200 400 600 800 1000 1200 1400 1600 V elocity (steps/s) 0 0.005 0.01 0.015 0.02 0.025 T ime (seconds) Fig. 3. Simulated velocity profile of a good (2-ohm) motor . –200 0 200 400 600 800 1000 1200 1400 1600 V elocity (steps/s) 0 0.005 0[...]

  • Page 6

    February 1994 Hewlett-Packard Journal 77 Reducing Stepper Noise. Once we had the speed that we needed, we had several more hurdles to pass. It was neces- sary to control the motor and make it start and stop pre- cisely without the noises that normally come from stepper motors. When the first DeskJet 1200C lab prototypes were built, people were very[...]

  • Page 7

    78 February 1994 Hewlett-Packard Journal stepper at slow speeds. For the first time we could measure pinion quality after the gears had been mounted on the motor shaft. W ith this measurement ability , we were able to work with the vendor and resolve tricky problems such as damag- ing the pinions and bending the motor shafts while mounting the gear[...]