technology of a toaster_class presentation

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Judith Lievens

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Page 1: Technology of a toaster_class presentation

Judith Lievens

Page 2: Technology of a toaster_class presentation

HISTORY

Page 3: Technology of a toaster_class presentation

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)

•1933 Spring loaded automatic toaster in

households

• 1960’s Common and cheap

• 1980’ … now

Page 4: Technology of a toaster_class presentation

PARTS

Page 5: Technology of a toaster_class presentation

Parts Shell

Page 6: Technology of a toaster_class presentation

Parts Shell - Handle

Page 7: Technology of a toaster_class presentation

Parts Shell – Switch&Options

Page 8: Technology of a toaster_class presentation

Parts Shell - Slots

Page 9: Technology of a toaster_class presentation

Parts Bottom

Page 10: Technology of a toaster_class presentation

Parts Crumb Tray

Page 11: Technology of a toaster_class presentation

Parts Inside

Lever

Plastic tab

Contacts

Metal tab

Electromagnet

Springs

Selfpositioning slot

PCB

Page 12: Technology of a toaster_class presentation

SO WHAT HAPPENS WHEN I TOAST MY SLICE OF BREAD?

Page 13: Technology of a toaster_class presentation

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!

Page 14: Technology of a toaster_class presentation

So what happens… When you turn the

switch?

Variable resistor

Page 15: Technology of a toaster_class presentation

So what happens… Pick an extra option?

Extra resistors

LED

Page 16: Technology of a toaster_class presentation

So what happens… When I push down?

Page 17: Technology of a toaster_class presentation

So what happens…Contacts close – lubicant – electrical circuit

When I push down?

Page 18: Technology of a toaster_class presentation

So what happens…Nichrome wires start toasting

When I push down?

Page 19: Technology of a toaster_class presentation

So what happens…Electromagnet – metal tab

When I push down?

Page 20: Technology of a toaster_class presentation

So what happens…Selfpositioning slot

When I push down?

Page 21: Technology of a toaster_class presentation

So what happens…Selfpositioning slot

When I push down?

Page 22: Technology of a toaster_class presentation

So what happens…Spring 1: stretches Spring 2: moves

down

When I push down?

Page 23: Technology of a toaster_class presentation

So what happens…

Capacitor charges

through resistor

= timer

When I wait?

Page 24: Technology of a toaster_class presentation

So what happens…Electromagnet is cut off and lets go

When I wait?

Page 25: Technology of a toaster_class presentation

So what happens…Spring 1: relaxes Spring 2: stops

components

When I wait?

Page 26: Technology of a toaster_class presentation

So what happens…Plastic tab – pulled upwards – contacts broken

When I wait?

Page 27: Technology of a toaster_class presentation

So what happens…Power to

nichrome wires

cut off

When I wait?

Page 28: Technology of a toaster_class presentation

So what happens…Selfpositioning slot

When I wait?

Page 29: Technology of a toaster_class presentation

So what happens…Selfpositioning slot

When I wait?

Page 30: Technology of a toaster_class presentation

So what happens…Normal Closed

Power is cut off

Electromagnet releases tray

Springs relaxes and pulls up the tray with toast

Contact for nichrome wiresis broken

When I push ‘stop’?

Page 31: Technology of a toaster_class presentation

So what happens… When I eat my toast?