Contents

  1. Introduction
  2. A little history
  3. Lesson 1. Feed: the sheet runs through the rollers
    1. 1.1. Idea: the feed
    2. 1.2. Idea: a gear "on edge" and a right-angle drive
    3. 1.3. Build
    4. 1.4. Check
    5. Paste for lesson 1 (Cmd+I)
  4. Lesson 2. Sheet sensors: entry and exit
    1. 2.1. Idea: a flag lever
    2. 2.2. Idea: why the exit sensor sits right on the roller
    3. 2.3. Build
    4. 2.4. Check
    5. Paste for lesson 2 (Cmd+I)
  5. Lesson 3. The head: a carriage on a belt
    1. 3.1. Idea: the stepper motor
    2. 3.2. Idea: the head
    3. 3.3. Build
    4. 3.4. Check
    5. Paste for lesson 3 (Cmd+I)
  6. Lesson 4. Stepper motor driver
    1. 4.1. The task
    2. 4.2. How logic solves it
    3. 4.3. Which chips and why
    4. 4.4. Build: head driver
    5. 4.5. Build: feed driver
    6. 4.6. Check
    7. Paste for lesson 4 (Cmd+I)
  7. Lesson 5. A line: the carriage moves by itself
    1. 5.1. The task
    2. 5.2. How logic solves it
    3. 5.3. Which chips and why
    4. 5.4. Build
    5. 5.5. Check
    6. Paste for lesson 5 (Cmd+I)
  8. Lesson 6. A whole sheet
    1. 6.1. The task
    2. 6.2. How logic solves it: a sequencer
    3. 6.3. The sensor at the head INLINE
    4. 6.4. Build
    5. 6.5. Check
    6. Paste for lesson 6 (Cmd+I)
  9. Lesson 7. The board and the second machine: the first transfer
    1. 7.1. What goes down the line
    2. 7.2. Build: sending and receiving
    3. 7.3. The board FAXBRD
    4. 7.4. The second machine
    5. 7.5. Check: the first transfer
    6. Paste for lesson 7 (Cmd+I)
  10. Lesson 8. Quality: from 5 mm to half a millimetre
    1. 8.1. Why the copy is rough
    2. 8.2. Sensor spot and pen width
    3. 8.3. Gearing 16 → 32: a 1.3 mm step
    4. 8.4. Half steps: a 0.65 mm step
    5. 8.5. Check
    6. Paste for lesson 8 (Cmd+I)
  11. Lesson 9. Faster and straighter: both ways
    1. 9.1. Both ways
    2. 9.2. The dot pen
    3. 9.3. Receiver timeout
    4. 9.4. Build (inside the board)
    5. 9.5. Check
    6. Paste for lesson 9 (Cmd+I)
  12. Lesson 10. A5 format
    1. 10.1. Two different sensors
    2. 10.2. Logic
    3. 10.3. Build: mechanics
    4. 10.4. Build: board
    5. 10.5. Check
    6. Paste for lesson 10 (Cmd+I)
  13. Lesson 11. One line and the panel
    1. 11.1. One line
    2. 11.2. Build
    3. 11.3. Panel
    4. 11.4. Check
    5. Paste for lesson 11 (Cmd+I)
  14. Summary
  15. All the parts
  16. Instructions in pictures