Automatic can opener

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==Components==
==Components==
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The can opener has several components and electrical assemblies.  It appears that most are purchased from suppliers while casings are injection molded in house.  Some components seem like they could be removed to allow for a faster and easier assembly.  Also, with a large enough scale of production, it may be beneficial to begin making some of the injection molded gears in house as well. Much more detail as to what individual components are used, what their purpose is, and their likely manufacturing processes.
{| class="wikitable" border="1"  
{| class="wikitable" border="1"  
|-  
|-  
-
! Part Number !! Part Name !! Qty !! Function  
+
! Part Number !! Part Name !! Qty !! Function !! Manufacturing Process
|-  
|-  
! 001  
! 001  
Line 45: Line 47:
*Protects against cutting wheel  
*Protects against cutting wheel  
*Holds magnet  
*Holds magnet  
 +
|| Injection Molded Plastic
|-  
|-  
! 002  
! 002  
Line 50: Line 53:
*Holds Batteries  
*Holds Batteries  
*Holds internal components  
*Holds internal components  
 +
|| Injection Molded Plastic
|-
|-
! 003
! 003
Line 55: Line 59:
*Holds button in place  
*Holds button in place  
*Holds internal components
*Holds internal components
 +
|| Injection Molded Plastic
|-
|-
! 004
! 004
| Screws(large) || 7 ||  
| Screws(large) || 7 ||  
*Used to fasten top and bottom cases together
*Used to fasten top and bottom cases together
 +
|| Cast
|-
|-
! 005
! 005
Line 64: Line 70:
*Safety feature to make sure battery casing is on
*Safety feature to make sure battery casing is on
*Safety feature to make sure opener is positioned on can
*Safety feature to make sure opener is positioned on can
 +
|| Electrical Switch, Stamped Sheet Metal and plastic housing
|-
|-
! 006
! 006
Line 69: Line 76:
*Provides pressure so that cutting wheel can pierce can
*Provides pressure so that cutting wheel can pierce can
*Rotates opener around can
*Rotates opener around can
 +
|| Cast or Forged
|-
|-
! 007
! 007
| Cap Screw || 1 ||
| Cap Screw || 1 ||
*Attaches cutting wheel to gearing
*Attaches cutting wheel to gearing
 +
|| Cast
|-
|-
! 008
! 008
| Washer || 1 ||
| Washer || 1 ||
*Provides adequate spacing between cap screw and cutting wheel
*Provides adequate spacing between cap screw and cutting wheel
 +
|| Stamped
|-
|-
! 009
! 009
| Cutting Wheel || 1 ||  
| Cutting Wheel || 1 ||  
*Cuts through can to remove lid
*Cuts through can to remove lid
 +
|| Stamped
|-
|-
! 010
! 010
Line 86: Line 97:
*Keeps opener mounted to can lid
*Keeps opener mounted to can lid
*Lifts top of can off when opener is lifted off
*Lifts top of can off when opener is lifted off
 +
|| Cast
|-
|-
! 011
! 011
| Reverse Switch || 1 ||
| Reverse Switch || 1 ||
*Reverses the direction of the motor
*Reverses the direction of the motor
 +
|| Electrical Switch, Injection Molded Plastics
|-
|-
! 012
! 012
| Manual Pinion || 1 ||
| Manual Pinion || 1 ||
*Allows manual rotation of the gear system using a screwdriver
*Allows manual rotation of the gear system using a screwdriver
 +
|| Injection Molded Plastic
|-
|-
! 013
! 013
| Positive Terminal || 2 ||
| Positive Terminal || 2 ||
*Attaches to positive end of battery
*Attaches to positive end of battery
 +
|| Stamped
|-
|-
! 014
! 014
| Negative Terminal || 2 ||
| Negative Terminal || 2 ||
*Attahced to negative end of battery
*Attahced to negative end of battery
 +
|| Stamped
|-
|-
! 015
! 015
| Main button || 1 ||
| Main button || 1 ||
*Initially turns on power to engage motor
*Initially turns on power to engage motor
 +
|| Injection Molded Plastic
|-
|-
! 016
! 016
| Internal Switch || 2 ||
| Internal Switch || 2 ||
*Completes circuit to power motor
*Completes circuit to power motor
 +
|| Stamped Metal and Injection Molded Plastics
|-
|-
! 017
! 017
| Switch Spacer || 1 ||
| Switch Spacer || 1 ||
*Spreads switch blades so it is only engaged when button is pressed
*Spreads switch blades so it is only engaged when button is pressed
 +
|| Injection Molded Plastics
|-
|-
! 018
! 018
| Screw(small) || 1 ||
| Screw(small) || 1 ||
*Mounts Switch Spacer to Upper Shell
*Mounts Switch Spacer to Upper Shell
 +
|| Cast
|-
|-
! 019
! 019
| Motor || 1 ||
| Motor || 1 ||
*Drives geartrain, movement wheel, and cutting wheel
*Drives geartrain, movement wheel, and cutting wheel
 +
|| Electrical Assembly, Case Drawn
|-
|-
! 020
! 020
| Circuit Board || 1 ||
| Circuit Board || 1 ||
*Allows reverse switch to reverse the motor's polarity
*Allows reverse switch to reverse the motor's polarity
 +
|| Electrical Assembly, single layer copper
|-
|-
! 021
! 021
| Motor Pinion || 1 ||
| Motor Pinion || 1 ||
*Transfers motor rotation to geartrain
*Transfers motor rotation to geartrain
 +
|| Injection Molded Plastics
|-  
|-  
! 022
! 022
| Ratio Gears || 3 ||
| Ratio Gears || 3 ||
*Gear down motor output to usable speed and torque
*Gear down motor output to usable speed and torque
 +
|| Injection Molded Plastics
|-
|-
! 023
! 023
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*Drives the movement wheel
*Drives the movement wheel
*Drives the cutting gear
*Drives the cutting gear
 +
|| Injection Molded Plastics
|-
|-
! 024
! 024
| Bent Pin || 1 ||
| Bent Pin || 1 ||
*Attaches movement gear to movement wheel
*Attaches movement gear to movement wheel
 +
|| Wire drawn or extruded
|-
|-
! 025
! 025
Line 148: Line 174:
*Moves cutting wheel into position
*Moves cutting wheel into position
*Slowly rotates cutting wheel
*Slowly rotates cutting wheel
 +
|| Injection Molded Plastic
|-
|-
! 026
! 026
| Slow Drive Gear || 1 ||
| Slow Drive Gear || 1 ||
*Moves the cutting gear slowly while engaged
*Moves the cutting gear slowly while engaged
 +
|| Injection Molded Plastic
|-
|-
! 027
! 027
| Shaft || 6 ||
| Shaft || 6 ||
*Mounts gears
*Mounts gears
 +
|| Extruded
|}
|}
 +
==DFMA, FMEA, DFE Analysis==
==DFMA, FMEA, DFE Analysis==

Revision as of 01:53, 12 February 2007

Contents

Product Dissection

The following notes were taken prior to and during product dissection.

Function/Purpose:

This can opener provides a low effort method to opening any size can.


Inputs/Outputs:

  • INPUTS: Battery Power
  • INPUTS: Positioning of opener
  • INPUTS: Press button until unit begins to move
  • OUTPUTS: Cut through can to open
  • OUTPUTS: Rotates around can

Use:

1. Opener is removed from storage place and placed in position on top of can.
2. Button is held until opener begins to move.
3. Let go and wait for opener to finish.

  • If the can is larger than a standard soup can multiple cycles must be used.

4. Lift the opener off of the can.

  • Because of the magnet, this also lifts the top off of the can.

5. Remove top of can from opener and replace opener in storage place.


Functional Operation:

1. Opener is positioned on can, which presses a safety switch.
2. Button on top is pressed to close main circuit using manual switch.
3. Motor engages and turns several gears to drive movement wheel and move the cutting wheel into position.

  • There are four gears used to gear down the movement wheel, with a fifth gear to further slow the cutting wheel.

4. As cutting wheel gets into position, the main circuit is closed using an automatic switch that is pressed by the top of the cutting wheel shaft.
5. The cutting wheel is even further geared down using a secondary portion to its gear. This allows it to rotate roughly ten degrees about six times through the cutting process.
6. When the cycle is nearly completed the cutting wheel is retracted again and the automatic switch is released, stopping the opener.
7. A magnet on the underside of the opener lifts the top of the can with it when the opener is lifted off.


Components

The can opener has several components and electrical assemblies. It appears that most are purchased from suppliers while casings are injection molded in house. Some components seem like they could be removed to allow for a faster and easier assembly. Also, with a large enough scale of production, it may be beneficial to begin making some of the injection molded gears in house as well. Much more detail as to what individual components are used, what their purpose is, and their likely manufacturing processes.

Part Number Part Name Qty Function Manufacturing Process
001 Battery Casing 1
  • Encloses batteries
  • Protects against cutting wheel
  • Holds magnet
Injection Molded Plastic
002 Lower Shell 1
  • Holds Batteries
  • Holds internal components
Injection Molded Plastic
003 Upper Shell 1
  • Holds button in place
  • Holds internal components
Injection Molded Plastic
004 Screws(large) 7
  • Used to fasten top and bottom cases together
Cast
005 Pressure switch 2
  • Safety feature to make sure battery casing is on
  • Safety feature to make sure opener is positioned on can
Electrical Switch, Stamped Sheet Metal and plastic housing
006 Movement Wheel 1
  • Provides pressure so that cutting wheel can pierce can
  • Rotates opener around can
Cast or Forged
007 Cap Screw 1
  • Attaches cutting wheel to gearing
Cast
008 Washer 1
  • Provides adequate spacing between cap screw and cutting wheel
Stamped
009 Cutting Wheel 1
  • Cuts through can to remove lid
Stamped
010 Magnet 1
  • Keeps opener mounted to can lid
  • Lifts top of can off when opener is lifted off
Cast
011 Reverse Switch 1
  • Reverses the direction of the motor
Electrical Switch, Injection Molded Plastics
012 Manual Pinion 1
  • Allows manual rotation of the gear system using a screwdriver
Injection Molded Plastic
013 Positive Terminal 2
  • Attaches to positive end of battery
Stamped
014 Negative Terminal 2
  • Attahced to negative end of battery
Stamped
015 Main button 1
  • Initially turns on power to engage motor
Injection Molded Plastic
016 Internal Switch 2
  • Completes circuit to power motor
Stamped Metal and Injection Molded Plastics
017 Switch Spacer 1
  • Spreads switch blades so it is only engaged when button is pressed
Injection Molded Plastics
018 Screw(small) 1
  • Mounts Switch Spacer to Upper Shell
Cast
019 Motor 1
  • Drives geartrain, movement wheel, and cutting wheel
Electrical Assembly, Case Drawn
020 Circuit Board 1
  • Allows reverse switch to reverse the motor's polarity
Electrical Assembly, single layer copper
021 Motor Pinion 1
  • Transfers motor rotation to geartrain
Injection Molded Plastics
022 Ratio Gears 3
  • Gear down motor output to usable speed and torque
Injection Molded Plastics
023 Movement Gear 1
  • Drives the movement wheel
  • Drives the cutting gear
Injection Molded Plastics
024 Bent Pin 1
  • Attaches movement gear to movement wheel
Wire drawn or extruded
025 Cutting Gear 1
  • Moves cutting wheel into position
  • Slowly rotates cutting wheel
Injection Molded Plastic
026 Slow Drive Gear 1
  • Moves the cutting gear slowly while engaged
Injection Molded Plastic
027 Shaft 6
  • Mounts gears
Extruded

DFMA, FMEA, DFE Analysis

Retrieved from "https://wiki.ece.cmu.edu/ddl/index.php/Automatic_can_opener"
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