Paper shredder

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| 002 || Switch || 1 ||
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| 003 || Base || 1 ||
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|004 || Feeder Lip Top || 1 ||
|004 || Feeder Lip Top || 1 ||
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|005 || Feeder Lip Bottom || 1 ||
|005 || Feeder Lip Bottom || 1 ||
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|006 || Child Safety || 1 ||
|006 || Child Safety || 1 ||
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|007 || Electrical Sub-Assembly || 1 ||
|007 || Electrical Sub-Assembly || 1 ||
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|008 || Helical Gear || 1 ||
|008 || Helical Gear || 1 ||
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|009 || Spur Gear 1 || 1 ||
|009 || Spur Gear 1 || 1 ||
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|010 || Spur Gear 2 || 1 ||
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|011 || Spur Gear 3 || 1 ||
|011 || Spur Gear 3 || 1 ||
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|012 || Light Bulb Reflector || 1 ||
|012 || Light Bulb Reflector || 1 ||
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|013 || Delay Trigger Housing || 1 ||
|013 || Delay Trigger Housing || 1 ||
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|014 || Random Black Plastic Piece || 1 ||
|014 || Random Black Plastic Piece || 1 ||
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|015 || Spring for Child Safety Switch || 1 ||
|015 || Spring for Child Safety Switch || 1 ||
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|016 || Bow-Tie Washer || 1 ||
|016 || Bow-Tie Washer || 1 ||
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|017 || Gear Train Housing Base Plate || 1 ||
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|019 || Main Rubber Shaft Base Plate || 1 ||
|019 || Main Rubber Shaft Base Plate || 1 ||
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|021 || Black Attachment Aligner for Motor Base Plate || 1 ||
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|022 || Screws || 31 ||
|022 || Screws || 31 ||
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|023 || Helical Blade Cutters || 104 ||
|023 || Helical Blade Cutters || 104 ||
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|024 || Flat Blade Cutters || 8 ||
|024 || Flat Blade Cutters || 8 ||
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|025 || White Aligners || 54 ||
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|026 || White Aligner Aligning Rod || 2 ||
|026 || White Aligner Aligning Rod || 2 ||
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|027 || Main Shaft || 1 ||
|027 || Main Shaft || 1 ||
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|028 || Basket || 1 ||
|028 || Basket || 1 ||
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|029 || Tab || 1 ||
|029 || Tab || 1 ||
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[[Category:Design studies]]
[[Category:Design studies]]

Revision as of 16:45, 27 January 2007

Image:Paper_shredder.jpg

Contents

Product Dissection

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

Conventional and Unconventional Purposes:

Shreds paper or credit cards placed correctly into feeder

  • Increase security – not able to easily retrieve information from shredded items
  • Facilitate disposal – reduce volume of garbage
  • Substitute for a recycling bin - provide a seperate container for paper wastes
  • Produce confetti - save money on party decorations

Inputs/Outputs:

  • Material Inputs: Paper, Staples, Credit Cards (no ties)
  • Information Inputs: Direction of motor rotation
  • Energy Inputs: 120V AC
  • Material Outputs: Shredded material inputs
  • Information Outputs: Operation status
  • Energy Outputs: Heat, Noise, Light

Operation Procedures:

  • If stored without power cord plugged into electrical wall outlet
    • Position basket in desired place (making sure it is close to an outlet)
    • Place shredder assembly on top of basket
    • Confirm the off/auto/reverse switch is in the off position
    • Plug power cord from shredder assembly into the wall outlet
  • If stored in the off position or continuing from un-powered storage
    • Set off/auto/reverse switch to auto
  • Identify the items for shredding, confirming acceptable destruction
    • Documents(s)
    • Credit Card
  • Confirm dimensions of items to be shredded
    • There is not more than a thickness of 8 pieces of paper
    • There is not more than one credit card
  • Orient items for better control when feeding them into the shredder
    • Align documents
    • Fold/unfold documents
    • Orient credit card to be fed long-ways
  • Confirm that the “ready light” is illuminated
  • Feed item into proper opening
    • Position document(s) in proper groove
    • Position credit card in proper slot
  • Action following feeding
    • Let go of document(s) once feeder has caught them, allowing them to be pulled through automatically
    • Continue pressing credit card downwards until no longer possible
  • If finished shredding, return to desired storage conditions
    • If placing in desired storage area
      • Turn off shredder
      • Unplug power cord from wall outlet
      • Pick up shredder assembly or shredder assembly and basket, placing it where desired
    • If leaving in desired spot
      • Can leave in auto position, off position, or off position with power cord unplugged from wall outlet

Specific User Considerations:

  • Certain tasks difficult for people with neural disorder and/or coordination difficulty
    • Feeding tasks
    • Switch control
  • Bending over to feed items difficult for individuals with orthopedic (e.g. back) and/or balance problems
  • Inconvenient and inefficient for large corporate tasks
  • Main shredder assembly is heavy and possibly difficult to lift for weaker individuals
    • Main shredder assembly must be lifted when emptying basket and setting up
    • Main shredder assembly may often be moved depending on storage preference

Functional Operation:

There are three switches in the electrical circuit that must be activated to begin shredding. First, the shredder must be properly resting on the waste bin to toggle the safety switch, and then the off/auto/reverse switch that allows power to go to the shredder must be moved to "auto". Finally, the paper being put into the shredder compresses an air damper which trips the third switch and sends power to the AC motor. The damper slowly depresses and when it is fully extended the switch is released, terminating the shredding process. The AC motor drives a gear train that reduces the speed of the shaft rotation and increases the torque. The first two gears are helical gears in order to reduce noise. At the end of the gear train, two spur gears are meshed and attached to individual shafts with cross-hatching blades. The blades are in a wave shape that cuts paper into the desired diamond shaped shreds. The blades spin in opposite directions and the paper is fed in between the spinning blades. The shredded paper falls into basket.


Components:

Part # Part name QTY Function Materials Dimensions Manufacturing Process
001 Top Cover 1
  • Functions
Materials Dimensions Maunfacturing Process
002 Switch 1
  • Functions
Materials Dimensions Maunfacturing Process
003 Base 1
  • Functions
Materials Dimensions Maunfacturing Process
004 Feeder Lip Top 1
  • Functions
Materials Dimensions Maunfacturing Process
005 Feeder Lip Bottom 1
  • Functions
Materials Dimensions Maunfacturing Process
006 Child Safety 1
  • Functions
Materials Dimensions Maunfacturing Process
007 Electrical Sub-Assembly 1
  • Functions
Materials Dimensions Maunfacturing Process
008 Helical Gear 1
  • Functions
Materials Dimensions Maunfacturing Process
009 Spur Gear 1 1
  • Functions
Materials Dimensions Maunfacturing Process
010 Spur Gear 2 1
  • Functions
Materials Dimensions Maunfacturing Process
011 Spur Gear 3 1
  • Functions
Materials Dimensions Maunfacturing Process
012 Light Bulb Reflector 1
  • Functions
Materials Dimensions Maunfacturing Process
013 Delay Trigger Housing 1
  • Functions
Materials Dimensions Maunfacturing Process
014 Random Black Plastic Piece 1
  • Functions
Materials Dimensions Maunfacturing Process
015 Spring for Child Safety Switch 1
  • Functions
Materials Dimensions Maunfacturing Process
016 Bow-Tie Washer 1
  • Functions
Materials Dimensions Maunfacturing Process
017 Gear Train Housing Base Plate 1
  • Functions
Materials Dimensions Maunfacturing Process
018 Gear Train Housing Top Plate 1
  • Functions
Materials Dimensions Maunfacturing Process
019 Main Rubber Shaft Base Plate 1
  • Functions
Materials Dimensions Maunfacturing Process
020 Black Plastic Cover Plate for Shaft Align 1
  • Functions
Materials Dimensions Maunfacturing Process
021 Black Attachment Aligner for Motor Base Plate 1
  • Functions
Materials Dimensions Maunfacturing Process
022 Screws 31
  • Functions
Materials Dimensions Maunfacturing Process
023 Helical Blade Cutters 104
  • Functions
Materials Dimensions Maunfacturing Process
024 Flat Blade Cutters 8
  • Functions
Materials Dimensions Maunfacturing Process
025 White Aligners 54
  • Functions
Materials Dimensions Maunfacturing Process
026 White Aligner Aligning Rod 2
  • Functions
Materials Dimensions Maunfacturing Process
027 Main Shaft 1
  • Functions
Materials Dimensions Maunfacturing Process
028 Basket 1
  • Functions
Materials Dimensions Maunfacturing Process
029 Tab 1
  • Functions
Materials Dimensions Maunfacturing Process
Retrieved from "https://wiki.ece.cmu.edu/ddl/index.php/Paper_shredder"
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