Paper towel dispenser
From DDL Wiki
Contents |
Executive Summary
Stakeholders
There are five major stakeholders with regards to the paper towel dispenser: Manufacturer, retailer, customer, user, society. The main needs for the manufacturer are to reduce cost and create a reliable product. For the retailer, it is being able to sell a quality product. For the customer, it is making sure it is an affordable and reliable machine. For the customer, cleanliness and ease of use are paramount. Society plays a role with regards to how the use of paper towel affects the ecosystem and earth in general. Listed below are the stakeholders and their respective needs.
Paper Towel Manufacturer
- Material cost
- Manufacturing cost
- Assembly
- Transporting
- Standardize/minimize parts
Retailer
- Cost
- Storage
- Reliability
- Usability
- Transporting
Customer
- Cost
- Mounting
- Ease of use
- Reliability
- Aesthetics
User
- Ease of use / ergonomics
- Speed of operation
- Aesthetics
- Cleanliness
Society
- Environment
Usability Study
Parts List
| Part No. | Name | Function | QTY | Weight | Material | Manufacturing Process | Image |
|---|---|---|---|---|---|---|---|
| 01 | Front Housing | Protects device from exterior | 1 | 935g | Plastic | Injection Molding | cell 1,8 |
| 02 | Front Housing Clip | Holds housings together | 1 | 13g | Steel | Bending, Punching | cell 1,8 |
| 03 | Front Housing Tab | Secures housing clip | 1 | <1g | Plastic | Injection Molding | cell 1,8 |
| 04 | Rear Housing | Holds mechanical components | 1 | 986g | Plastic | Injection Molding | cell 1,8 |
| 05 | Paper Towel Holding Arm | Holds paper towel roll | 2 | 40g each | Plastic | Injection Molding | cell 1,8 |
| 06 | Phillips Head Screw (1/8 x 1/4 long) | Secures device to rear housing | 1 | 1g | Steel | Machined | cell 1,8 |
| 07 | Wall Mounting Screw (1/8 x 1.25 long) | Secures housing to wall | 4 | 3.5g each | Steel | Machined | cell 1,8 |
| 08 | Screw Anchor | Holds screw in wall | 4 | ~0.25g | Plastic | Injection molding | cell 1,8 |
| 09 | Paper Guide Tube | Guides paper towel to cutting cylinder | 1 | 55g | Plastic | Injection molding | cell 1,8 |
| 10 | Spring (uneven hooks) | Holds 09 in place | 2 | 2g each | Metal | Extrusion | cell 1,8 |
| 11 | Spring (even hooks) | Holds lever to spindle housing | 2 | 1.5g each | Metal | Extrusion | cell 1,8 |
| 12 | Screw (3/32 x 5/8 long) | holds turning wheel and lever to spindle housing | 2 | ~1g each | Metal | Extrusion | cell 1,8 |
| 13 | Red Screw Cap | Hides screw in turning wheel | 1 | <1g | Plastic | Injection molding | cell 1,8 |
| 14 | Locking Spring | Ensures correct wheel spin direction | 1 | 4g | Steel | Extrusion | cell 1,8 |
| 15 | Red Turning Wheel | Turns main spindle | 1 | 30g | Plastic | Injection molding | cell 1,8 |
| 16 | Guide clips for 09 | Guides paper on 09 | 2 | 2.5g each | Plastic | Injection molding | cell 1,8 |
| 17 | Screw (3/32 x 3/8 long) | Holds lever assembly together and spindle housing | 2 | <1g each | Metal | Machined | cell 1,8 |
| 18 | Lever Arm | Connects spring to spindle | 1 | 1g | Plastic | Injection molding | cell 1,8 |
| 19 | Spring Connector | Connects two springs to lever arm | 1 | <1g | Plastic | Injection molding | cell 1,8 |
| 20 | Rounded Spring Guide | Angles spring to desired measurement | 1 | <1g | Plastic | Injection molding | cell 1,8 |
| 21 | Thin Paper Guide | Guides paper out of device | 1 | 24g | Plastic | Injection molding | cell 1,8 |
| 22 | Front Spindle Housing | Final housing before paper leaves device | 1 | 132g | Plastic | Injection molding | cell 1,8 |
| 23 | Spindle Housing Back | Back of spindle housing | 1 | 162g | Plastic | Injection molding | cell 1,8 |
| 24 | Spindle Housing (L) | Left of spindle housing | 1 | 105g | Plastic | Injection molding | cell 1,8 |
| 25 | Spindle Housing (R) | Right of spindle housing | 1 | 105g | Plastic | Injection molding | cell 1,8 |
| 26 | White Spindle Guide | Holds spindle in line | 3 | 2.3g each | Plastic | Injection molding | cell 1,8 |
| 27 | Screw (3/32 x 3/8 long) | Connects spindle halves | 2 | <1g | Metal | Machined | cell 1,8 |
| 28 | Square nut | For use with 27 | 2 | <1g | Steel | Cast and drilled | cell 1,8 |
| 29 | White Teeth Guide/Arm | Guides cutting teeth in spindle | 2 | 3g each | Plastic | Injection molding | cell 1,8 |
| 30 | Cutting Teeth | Cuts paper towel | 1 | 75g | Steel | Cast, punched and bent | cell 1,8 |
| 31 | Spindle Top | Holds cutting tool | 1 | 125g | Plastic | Injection molding | cell 1,8 |
| 32 | Spindle Bottom | Holds cutting tool | 1 | 135g | Plastic | Injection molding | cell 1,8 |
| 33 | Metal Key | Helps open housing | 1 | 5g | Steel | Punched | cell 1,8 |
DFMA Analysis
Design For Manufacture
Design For Assembly
FEMA Analysis
| Part No. | Name and Function | Failure Mode | Effects of Failure | S | Causes of Failure | O | Design Controls | D | RPN | Recommended Actions | Responsibility |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 01 | Front Housing | ||||||||||
| 02 | Front Housing Clip | ||||||||||
| 03 | Front Housing Tab | ||||||||||
| 04 | Rear Housing | ||||||||||
| 05 | Paper Towel Holding Arm | ||||||||||
| 08 | Screw Anchor | ||||||||||
| 09 | Paper Guide Tube | ||||||||||
| 10 | Spring (uneven hooks) | ||||||||||
| 11 | Spring (even hooks) | ||||||||||
| 13 | Red Screw Cap | ||||||||||
| 14 | Locking Spring | ||||||||||
| 15 | SRed Turning Wheel | ||||||||||
| 16 | Guide clips for 09 | ||||||||||
| 18 | Guide clips for 09 | ||||||||||
| 19 | Spring Connector | ||||||||||
| 20 | Rounded Spring Guide | ||||||||||
| 21 | Thin Paper Guide | ||||||||||
| 22 | Front Spindle Housing | ||||||||||
| 23 | Spindle Housing Back
|
| header 1 | header 2 | header 3 |
|---|---|---|
| Row header 1 | cell 1,1 | cell 1,2 |
| Row header 2 | cell 2,1 | cell 2,2 |
DFE Analysis
