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Technology of a toaster
- 1. Techno- logy of a Toaster (for dummies) Judith Lievens
- 2. Content HISTORY PARTS SO WHAT HAPPENS WHEN I TOAST MY SLICE OF BREAD?
- 3. HISTORY
- 4. History • Why ? • Electricity in America • 1900 Embedded heating • 1905 Nichrome (Albert Marsh) • 1909 First electric toaster (Frank Shailor for General Electrics) • 1913 Toaster with automatic turner (Lloyd Copeman) • 1919 Automatic pop-up (Charles Strite) •1928 Pre sliced bread • 1933 Spring loaded automatic toaster in households • 1960’s Common and cheap
- 5. History
- 6. PARTS
- 7. Parts Shell
- 8. Parts Shell - Handle
- 9. Parts Shell – Switch&Options
- 10. Parts Shell - Slots
- 11. Parts Bottom
- 12. Parts Crumb Tray
- 13. Parts Inside Handle connection Plastic tab Contacts Metal tab Electromagnet Springs Selfpositioning slot PCB
- 14. SO WHAT HAPPENS WHEN I TOAST MY SLICE OF BREAD?
- 15. So what happens… With a HEMA toaster
- 16. So what happens… 1. Plug in the toaster 2. Turn the switch 3. Optionally pick ‘bagel’, ‘defrost’ or ‘reheat’ 4. Place your slices of bread 5. Push the tray down with the handle 6. Wait or push ‘stop’ 7. Take out your bread 8. Empty crumb tray 9. Pull out the plug 10. Eat it!
- 17. So what happens…When you turn the switch? Variable resistor
- 18. So what happens…Pick an extra option? Extra resistors LED
- 19. So what happens…When I push down the handle?
- 20. So what happens… Plastic component ↓ Lubicant axes When I push down the handle?
- 21. So what happens… Contacts close – lubicant – electrical circuit When I push down the handle?
- 22. So what happens… Nichrome wires start toasting When I push down the handle?
- 23. So what happens… Electromagnet – metal tab When I push down the handle?
- 24. So what happens… Selfpositioning slot When I push down the handle?
- 25. So what happens… Selfpositioning slot When I push down the handle?
- 26. So what happens… Spring 1: stretches Spring 2: moves down When I push down the handle?
- 27. So what happens… Capacitor charges through resistor = timer When I wait?
- 28. So what happens… Electromagnet is cut off and lets go When I wait?
- 29. So what happens… Spring 1: relaxes Spring 2: stops components When I wait?
- 30. So what happens… Plastic tab – pulled upwards – contacts broken When I wait?
- 31. So what happens… Power to nichrome wires cut off When I wait?
- 32. So what happens… Selfpositioning slot When I wait?
- 33. So what happens… Selfpositioning slot When I wait?
- 34. So what happens… Normal Closed ↓ Power is cut off Electromagnet releases tray Springs relaxes and pulls up the tray with toast Contact for nichrome wires is broken … When I push ‘stop’?
- 35. So what happens…When I eat my toast?