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 | Function | Failure Mode | Effects of Failure | S | Causes of Failure | O | Design Controls | D | RPN | Recommended Actions | Responsibility |
---|---|---|---|---|---|---|---|---|---|---|---|---|
01 | Front Housing | Protects device from exterior | Fractured | |||||||||
02 | Front Housing Clip | Fractured | text | text | text | text | text | text | text | text | text | |
03 | Front Housing Tab | Fractured | ||||||||||
04 | Rear Housing | Fractured | ||||||||||
05 | Paper Towel Holding Arm | |||||||||||
08 | Screw Anchor | Fractured | ||||||||||
09 | Paper Guide Tube | Failed | ||||||||||
10 | Spring (uneven hooks) | Broken | ||||||||||
11 | Spring (even hooks) | Broken | ||||||||||
13 | Red Screw Cap | Fractured | ||||||||||
14 | Locking Spring | Broken | ||||||||||
15 | SRed Turning Wheel | Failed | ||||||||||
16 | Guide clips for | |||||||||||
18 | Guide clips for | |||||||||||
19 | Spring Connector | |||||||||||
20 | Rounded Spring Guide | |||||||||||
21 | Thin Paper Guide | |||||||||||
22 | Front Spindle Housing | |||||||||||
23 | Spindle Housing Back |
DFE Analysis