# Product Analysis: Gate 3

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Figure 1: Various components of "Inky," our HP Officejet 7310.

# Coordination Review

## Cause for Corrective Action

Our group has worked very well together up to this point, and at the time is faced with no unresolved challenges. One difficulty we had however was finding a good time that we could all meet outside of school to work on our product. Between jobs and class, it seemed that none of schedules ever really matched up. To overcome this issue we found two solutions. The first one was to work late, very late. If the only time that we could all get together was twelve at night, then we as a group were willing to do that. The other option we utilized was to not meet as an entire group, but to work in shifts. If two of us were free at a certain time, we could go work on the printer alone until more group members arrived to help.

# Product Evaluation

## Component Complexity

When categorizing the complexity of a component, it is important to consider its function, form, and manufacturing methods. If a component has numerous intricate functions, it increases its complexity. If a component has elaborate form, it also directly corresponds with its complexity. Lastly, if it is difficult or complicated to manufacture, it enhances its overall complexity. In summary, the function, form, and manufacturing methods of a component all directly correlate with one another and with complexity. With that being stated, a meaningful scale can be defined if it addresses the function, form, and manufacturing methods of a component. In order to document our components and parts more efficiently, we devised this complexity scale:

Table 1: Complexity Scale
Complexity # Description
1
• Very basic: Component has a basic shape, consists of only one part and is made of only one material. Performs a basic function. Easily manufactured. No flows and little interaction with other components.
2
• Basic: Component has a somewhat complex shape, but still consists of only one part and/or is made of only one material. Performs basic function(s). Easily manufactured. Some flows and little interaction with other components.
3
• Moderate: Component has a complex shape, consists of multiple parts and/or is made of multiple materials. Performs moderate function(s). Requires more specialized manufacturing. Some flows and has basic interactions with more than one other component.
4
• Complex: Component has a complex shape, may consist of multiple parts and/or is composed of multiple materials. Performs complex function(s). May need aid of a computer to manufacture. Multiple flows and has basic interactions with more than one other component.
5
• Very Complex: Component has an intricate shape, consists of multiple parts and/or is composed of multiple materials. Performs multiple complex functions. May require the aid of a computer to manufacture. Multiple flows and has complex interactions with several other components.

## Component Summary and Product Analysis

Table 2: Component Summary and Product Analysis (The first six components of Table 2 include a product analysis)
# Component (occurrence) Part # Function Materials / Size (inches) Manufacturing Process Complexity Image
1 Control Panel Faceplate-English (x1) Q5562-60002 Provides the user with full access to change settings, carry out functions, accomplish tasks, and view status of the product.
• Plastic, metal
• 15x4x0.5
Injection molding 5
The control panel is the apparatus that allows the user to have full access of the functions of the printer. It helps to perform multiple functions, as it is the starting point for every function initiated by the user. The control panel uses electricity as an energy flow to power its circuit board and display. It also takes the human signal of pushing the button and transforms it into a signal flow the printer can use. The control panel operates on the outside of the printer.

It is wide in shape and the buttons are spread out enough that they are easily distinguishable and able to be read. It is symmetric in its shape, but not in the placement of the buttons. While the buttons give the control panel depth, it is still primarily a two dimensional object. The shape of the panel is this way in order to give the user enough room between the buttons. It is a relatively heavy piece, weighing about one or two pounds. The panel is made from plastic for the major parts, but includes some metals and other materials in the display and circuit board. Manufacturing decisions certainly impacted the choice to use plastic, as it is cheap and easily molded. A societal factor of this decision was the want to make it look nice. Plastic can be any color and has a smooth finish. Underneath the interface panel is a circuit board that carries out numerous flows based on the desired task and the action taken by the user in order to execute it. Aesthetic properties are vital in this component as this is what the user will be looking at when using the machine. Its purpose is to provide a well-organized layout that is sleek in appearance and as a high level of ease of use. The main color is gray, which is probably intended to match and correlate with the other exterior parts of the printer. Its surface finish is smooth, for mainly aesthetic reasons, and because the user will be handling this part often.

Injection molding was used to make this part, evident by the blisters on the back side of the panel where the mold was removed. The choice to use plastic likely impacted this decision, as the panel has a unique shape, and plastic is easily shaped through injection molding. Economically using this method makes sense. Many of these parts will be made, and having a mold allows them to be made quickly and efficiently.

2 Scanner (x1) Q5562-SCANNER Moves back and forth throughout scan cavity and captures images to either copy or store in computer.
• Plastic, glass, metal
• 10x4x1.5
Injection molding, forging, drilling, anealing 5
The scanner captures an image and transforms it into a digital version. It only performs the single function of capturing this image, and performs no other. The flow of electrical energy powers the light and sensor needed to capture an image, while the mechanical flow of energy from the motor moves the scanner along. There is also a signal flow from the main circuit board to the scanner and back again. The scanner functions in the inside of the scan cavity, cut off from the outside of the printer.

The scanners shape is big and bulky, with rivets and holes for wires and other input/output mechanisms. It has symmetry across both its two dimensional axes. It is however primarily three dimensional. Its shape is necessary for its performance as the scanner needs to fit within a certain area. Any bigger and it would get in the way of other functions and since this is a moving component, it would have difficulties moving in its own workspace. Also a flat side must be facing the image to be scanned, in order to achieve the best scan results. It weighs about 3 pounds, and is made from a variety of materials for several reasons. It is composed of metal for strength purposes, plastic for economical reasons, and glass for scanning purposes. Manufacturing decisions didn’t really impact this, as all of these materials are necessary to perform the scanner’s function. The light weight of the plastic helps the scanner to move, and the glass is necessary in order for the sensor to see the image. These different materials coexist very well, and therefore improve the quality of the machines functionality. Aesthetic aspects of this part are minimal as it is well hidden and insignificant. Its color however is black, not to make it look good, but for functionality. The black absorbs the light from the scanner, where as a lighter color would reflect it and lessen the quality of the resulting image. The surface finish is smooth, more because of the manufacturing processed used to make the part than anything else.

The manufacturing processes of Injection molding, forging, drilling, and annealing were all used to make this part. The material choice impacted these decisions, as the materials were necessary for function. The resulting processes were chosen because they were the most economical to handle the specifications and shapes of the materials.

3 Rollers (x1) Q5562-ADF_ROLLER_KIT Rotate in order to catch paper from input tray and feed it into printer
• Plastic, rubber, metal
• 10x2x2
Turning 2
The rollers here that are shown on this metal shaft are used to help feed the paper into the printing process. They perform no other function than to move the paper throughout the printer. The flow of mechanical energy from the gear train moves the shaft, which in turn moves the material flow of paper. These rollers function inside the printer, along the paper path.

The general shapes of the rollers themselves are circular, and the shaft is long and cylindrical. Each individual part is symmetrical, but when combined they only have radial symmetry. This piece is primarily three dimensional. This part roughly weighs about one pound. The Rollers and gears are made of plastic. The rubber is fitted over the black rollers to use for a friction base to be able to send the paper through the process. Manufacturing processes did not impact this decision, as the materials chosen are needed for function. The plastic gears and rollers are made of plastic primarily because it is cheap to work with and the high quantity needed. The shaft is steel for good, strong support, and the rubber rollers are needed for friction. Economically, these materials were chosen because they were cheapest materials that could perform the task. This piece is pretty well hidden, so the aesthetic value is low. The gears are black and the shaft is chrome. The black was chosen to hide the dirt and ink that may accumulate on the roller, as this part can be removed to fix paper jams. The surface finish of all the parts is smooth for functional reasons. This is necessary for the roller especially, as it needs to turn with the minimum amount of friction. The rubber rollers are smooth so they don’t mark up the paper.

The manufacturing processes of turning and injection molding was used to make these parts. The radial symmetry of the shaft makes a strong case for turning, and the blisters present on the rollers points toward injection molding. Material choice impacted these decisions. These two processes are the cheapest and most efficient for the volume and type of parts they are making. Shape also impacted the manufacturing process, especially in the case of the cylindrical shaft. Economic factors influenced the decision to use these processes and achieve the lowest price.

4 Tension Arm (x1) Q5562-ARM_TENSION Prevents the belt from slipping or sliding by increasing maintaining tension
• Metal, plastic
• 1.5x0.75x0.5
Injection molding, die cast, drilling 2
The tension arm gives additional tension to the small belt so it doesn’t slip or slide. It performs no other functions than supplying tension. The arm interacts with the belt which in turn interacts between the motor and gears. In this way it is associated with the flow of mechanical energy throughout the printer. It operates inside the printer in the relatively roomy space on the outer layer.

The shape of this component is generally rectangular with two flexible arms connected at the center. These arms have a roller on each of them. There is symmetry along the horizontal axis as shown in the picture, but not along the others. It is a three dimensional shape, with the arms coming away from the joint, where it is also connected to the printer itself. This shape, coupled with flexibility in the arms, is the most important part in supplying tension to the belt, giving flexibility without sacrificing strength. This piece is roughly 10 grams, and is made from steel and plastic. Manufacturing decisions didn’t impact the material selection as much as the function they need to perform. The steel that makes up the arms was made thin, giving the steel the flexibility and strength needed to provide extra tension. Economically, this piece is cheap due to its size and the slim width of the material. The decision to use plastic for the rollers also helped to reduce cost. There is no aesthetic value to this part, as it is never seen by the user. The part is chrome, due to the unaltered steel, and the plastic rollers are white. This gives them contrast with the black belt, making the two easier to distinguish. The surface finish is smooth for functional reasons, especially on the rollers, so as to provide as much tension without providing additional friction.

This piece is made from injection molding, die casting, and drilling. There are small blisters on the rollers, which act as evidence for injection molding. The holes in the steel are evidence for drilling. Material choice did impact this decision. The material was chosen for its properties, and the manufacturing processed based on what material was chosen. This shape is also small, so die casting was selected for the metal part and injection molding for the roller. In this way good detail was achieved. The hole necessary for the base impacted the decision to use drilling. Economic reasons also impacted the choice of manufacturing processes. As these parts will made in large volume, molds will save money.

5 Drive Assembly (x1) Q5562-DRIVE_ASSY Moves paper by generating friction and provides information regarding the position of the paper
• Metal, rubber, plastic
• 12x2x2
Injection molding, turning, forging 3
The drive assembly consists of rollers and an encoder disk. The rollers move the paper along, and the encoder disk helps to provide position information of the paper. In this way the component helps to perform multiple functions. The material flows of paper, as well as signal flows from the encoder disk, interact directly with this assembly. This part functions in the inside of the printer along the paper path.

It is primarily a roller, and cylindrical in its shape. The encoder disk’s shape, which is also circular, allows it to transmit information as the rollers turn. The gear box on its left side in the picture is irregular in its shape, allowing the gears it houses to mesh together. It is a primarily a three dimensional part. The cylindrical shape of this part is necessary in order to move the paper throughout the printer. This part weighs about 2pounds. The rollers themselves are made from rubber due to their high coefficient of friction in order to grab the paper. The shaft is steel, and the encoder disk is plastic, embedded with information strips. Manufacturing decisions did not impact the material selection. The material properties are needed for it to function. The steel in the shaft gives strength, the plastic in the encoder disk gives flexibility, and the rubber gives friction. Economic factors helped influence this decision, as the materials selected are the cheapest that can still accomplish the function well. There are no aesthetic properties to this component, as it is not seen. The color of the shaft is chrome, and the rollers are black. The gear box is white. The black and white in this case help contrast and distinguish these parts from others. The finish is smooth. This is for functional reasons. The rollers are smooth so they don’t mark the paper, the gear box to reduce friction, and the encoder due to the electronics it houses.

Injection molding and turning were used to manufacture these parts. The cylindrical shapes of the shaft and rollers are best made by rolling, and the gears box has blisters that prove injection molding. Material choices impacted this decision, and shape as well, in order to obtain the detail needed without losing strength. Economic reasons influenced the manufacturing decisions. These parts will be made in high volume, and injection molding will help save money.

6 Gear Assembly (x1) Q5562-GEAR_ASSY Acts as a transmission of mechanical energy from the motor to the shaft with the rollers in order to assist in the movement of the paper
• Plastic, metal
• 7x2.5x1
Injection molding, die cast, drilling 4
The gear assembly acts as a transmission between the drive motor and the shafts that it turns. The component helps to perform multiple functions as it rotates the shaft which turns the rollers and ultimately moves the paper. This correlates to the flows associated with it, as it transfers mechanical energy generated by the motor in order to rotate the shaft and rollers. That rotation is then used to catch the paper and move it along. The assembly operates on the side of the printer, and needs to be flat as possible to conserve space.

The general shape of the component is rectangular, and it does not have any notable properties. It is primarily three-dimensional. There are several notches and holes in the assembly base where the shaft can rest and wires can be placed to get them out of the way. The component weighs approximately one pound. The assembly base is made from metal, but the gears are plastic. The metal is chosen to supply the support and stability needed to complete its function. A societal factor that influenced this decision is simply to increase the performance and ease of use by creating a more stable functioning machine. Economic factors influenced the decision to make the gears cheaper by using plastic. An environmental factor that influenced this decision is that both metal and plastic are easily reusable and recyclable, lessening the amount of waste created. The aesthetic properties of this component are irrelevant due to the fact that it does not have an aesthetic purpose because it is an interior part and is not seen during use. The metal piece of the component is gray, a common structural color. The gears are white and the belt is black for the purpose of contrast and distinguishability from each other. The surface finish of the metal is smooth due to the manufacturing processes involved in making it. The belt is finished so it can better catch the gears.

The base is made from die casting, as its shape has some lofts and holes best formed by a mold. The material of the component also played a factor in the manufacturing decision, as metal and plastic are both commonly made through die casts. Die casting is economical for this printer part, as many of them are going to be made.

7 Ribbon (x1) Q5562-RIBBON Connects circuit board to print mechanism
• Plastic, metal
• 22x0.5
Photochemical machining 4
8 Nameplate-Front (x1) 7121-8043 Covers inner components on the front of the machine.
• Plastic
• 20x2x1
Injection Molding 1
9 Nameplate-Back (x1) 7121-8043 Covers inner components on the back of the machine.
• Plastic
• 20x2x1
Injection Molding 1
10 Fax door (x1) Q5562-DOOR Covers the fax assembly and its components
• Plastic
• 10x5x2
Injection Molding 1
11 Width guides (x2) Q5562-ADF_OUTPUT_TRAY Adjusts fax tray width to the paper
• Plastic
• 4x2x0.5
Injection Molding 1
12 Input tray (x1) Q5562-ADF_INPUT_TRAY Encomposses pages to be faxed
• Plastic
• 9x8x0.5
Injection Molding 1
13 Output tray edge (x1) Q5562-ADF_OUTPUT_TRAY Adds aesthetic appeal to output tray
• Plastic
• 10x1x0.5
Injection Molding 1
14 Tray extender (x1) Q5562-EXTENDER_INPUT Slides in or out to make input tray shorter or longer
• Plastic
• 5x5x0.125
Injection Molding 1
15 Width guides (x2) Q5562-ADF_FEED_ASSY Adjusts in tray for different paper widths
• Plastic
• 6x1x0.125
Injection Molding 1
16 Output tray (x1) Q5562-ADF_OUTPUT_TRAY A tray that contains incoming faxes
• Plastic
• 20x12x3
Injection Molding 1
17 ADF housing (x1) Q5562-ADF_ROLLER_KIT Takes multiple pages and feeds them one page at a time so the user does not have to replace them when making a fax
• Plastic, metal
• 10x3x1
Injection molding, turning, forging 2
18 Fax ADF and encoder (x1) Q5562-ADF_FAX Scans document and converts it to a single image
• Plastic, metal, cork
• 10x5x3
Injection molding, forging, drawing 3
• Plastic, rubber, foam
• 3x2x1
Rolling, drilling, injection molding 3
20 Shaft and Gear (x1) Q5562-FEED_ROLLERS Holds and rotates rubber guides
• Metal, plastic
• 10x1x1
Injection molding, forging, turning 2
21 Rubber guide (x2) Q5562-FEED_ROLLERS Moves sheet of paper by friction
• Rubber
• 0.5x0.5x0.5
Injection molding 1
22 Bracket (x1) Q5562-GEAR_ASSY Holds gears and shaft
• Metal
• 4.5x2.5x0.5
Die casting, drilling 2
23 Gear (x1) Q5562-GEAR_ASSY Transfer mechanical energy to other gears, turning shaft
• Plastic
• 1x1x0.5
Injection molding 1
24 Gear (x1) Q5562-GEAR_ASSY Transfer mechanical energy to other gears, turning shaft
• Plastic
• 1x1x0.1
Injection molding 1
25 Gear (x1) Q5562-GEAR_ASSY Transfer mechanical energy to other gears, turning shaft
• Plastic
• 1x1x0.5
Injection molding 1
26 Gear Train-L(x1) Q5562-GEAR_ASSY Rotates shaft from the left side
• Plastic, metal
• 1.5x0.5x0.5
Injection molding 2
27 Gear Train-R(x1) Q5562-GEAR_ASSY Rotates shaft from the right side
• Plastic, metal
• 1.5x0.5x0.5
Injection molding 2
28 ADF motor (x1) Q5562-MOTOR_ADF Drives fax rollers that feed one paper at a time through the fax mechanism
• Metal, plastic
• 2.5x1.5x1
Injection molding, die cast 3
29 Gear (x3) Q5562-GEAR_ASSY Transfer mechanical energy to other gears, turning shaft
• Plastic
• 0.75x0.75x0.5
Injection molding 1
30 Gear Train (x1) Q5562-GEAR_ASSY Rotates shaft
• Plastic, metal
• 1.5x0.75x0.5
Injection molding 2
31 Roller stops (x2) Q5562-FEED_ROLLERS Keeps the roller from sliding
• Plastic
• 0.75x0.75x1
Injection molding 1
32 Spring (x1) Q5562-DRIVE_ASSY Helps to keep gears aligned by increasing stability
• Metal
• 1.5x0.25x0.25
Forging 1
33 Frame (x1) Q5562-FEED_ROLLERS Supplies support for the fax subsystem
• Metal
• 8x0.25x0.25
Forging, drilling 1
34 Gear(x1) Q5562-GEAR_ASSY Transfer mechanical energy to other gears, turning shaft
• Plastic
• 0.5x0.5x0.25
Injection molding 1
35 Metal Rod(x1) Q5562-FEED_ROLLERS Provides support for the fax mechanism
• Metal
• 3.5x0.1x0.1
Turning 1
36 Fax Casing(x1) Q5562-FEED_ROLLERS Provides support for the fax mechanism.
• Plastic
• 2x1.5x0.5
Injection molding 1
37 Control Panel Casing (x1) Q5562-60002 Holds the control panel in place.
• Plastic
• 15x3x2.5
Injection molding 1
38 Copier Glass (x1) Q5562-GLASS_ASSY Gives a surface to lay pages on so a scan may be taken
• Plastic, glass
• 21.5x11.5x1.5
Injection molding, drawing, anealing 2
39 Scanner Rod (x1) Q5562-ROD_SCANNER Shaft that scanner assembly rides on
• Rubber, plastic, metal
• 20.5x0.5x3
Injection molding, die cast, turning 4
40 Scan cavity (x1) Q5562-COVER_CARTRIDGE Houses scan head and acts as a door to the printer
• Plastic, metal
• 21.5x12x2.5
Injection molding, die cast, drilling, drawing 4
41 Cover (x1) Q5562-COVER_MAIN Allows for access to interior parts, but can also cover them
• Plastic
• 4x3.5x0.25
Injection molding 1
42 Rollers (x1) Q5562-ADF_ROLLER_KIT Catches paper with the use of friction and feeds into printer
• Plastic, metal, rubber
• 13x1x1
Injection molding, forging 2
43 Carriage Rod (x1) Q5562-ROD_CARRIAGE Shaft that carriage rides on
• Metal
• 16x0.5x0.5
Turning 1
44 Encoder disk cover (x1) Q5562-DRIVE_ASSY Protect encoder disk and its components
• Plastic
• 5x2x1
Injection molding 2
45 ADF Motor (x1) Q5562-ADF_MOTOR Primary motor that feeds the documents through one page at a time
• Metal, plastic
• 2.5x1.5x1.5
Injection molding, die cast 4
46 Carriage Motor (x1) Q5562-MOTOR_CARRIAGE Drives carriage assembly
• Metal, plastic
• 2x1x1
Injection molding, die cast 4
47 Bracket (x1) Q5562-BRACKET Used as a support for the interior parts of the machine. Allows for connection of outer casing as well as interior components
• Plastic, metal
• 9x4.5x4
Injection molding, die cast, drawing 3
48 Absorber (x1) C6490-80022 Soaks up used ink during cartridge cleaning
• Plastic, metal
• 7x3.5x3
Injection molding, die cast, drilling 4
49 Carriage (x1) C8963-60098 Holds and positions print cartridges
• Plastic, metal
• 6x3x2
Injection molding, drilling 4
50 Frame roller (x1) Q5562-ADF_ROLLER_KIT Gives support and guides paper through printing process
• Plastic, metal
• 9.5x1.5x0.25
Injection molding, die cast 3
51 Frame (x1) Q5562-CHASSIS Used as a support for the interior parts of the machine. Allows for connection of outer casing as well as interior components
• Metal, plastic
• 13x1x0.5
Injection molding, die cast, drilling 3
52 Frame (x1) Q5562-CHASSIS Used as a support for the interior parts of the machine. Allows for connection of outer casing as well as interior components
• Metal, plastic
• 16x12x1.5
Injection molding, die cast, forging 2
53 Frame (x1) Q5562-CHASSIS Used as a support for the interior parts of the machine. Allows for connection of outer casing as well as interior components
• Metal
• 9x2.5x0.5
Die casting, drilling 2
54 Guide (x1) Q5562-GUIDE_PAPER Gives support and guides paper throughout the printing process
• Plastic, felt, sponge
• 9.5x3x0.5
Injection molding, milling foam 4
55 Paper Guide (x4) Q5562-GUIDE_PAPER Presses paper against roller to enhance movement
• Plastic, metal
• 2x2x1
Injection molding, drawing 1
56 Cover (x1) Q5562-COVER_MAIN Covers the printer, acts as a separator to the scanner and the printer
• Plastic, metal
• 20x11x5
Injection molding, drilling, drawing 3
57 Circuit board (x1) Q5562-ADF_PC_BRD Transmits information in order for machine to carry out functions
• Plastic, metal
• 11x4.5x1.5
Injection molding, soldering 5
58 Printer back (x1) Q5562-CHASSIS Encompasses interior parts of printer
• Plastic
• 18x6x1.5
Injection molding 2
59 Side cover(x1) Q5562-CHASSIS Allows for easy opening of the scanner
• Metal, plastic
• 5.5x4.5x1
Injection molding, forging, drilling 3
60 Side cover-L (x1) Q5562-COVER_MAIN Encompasses interior parts of printer on the left side
• Plastic, metal
• 11x5.5x5
Injection molding, forging, drilling 2
61 Side cover-R (x1) Q5562-COVER_MAIN Encompasses interior parts of printer on the right side
• Plastic, metal
• 11x5.5x5
Injection molding, drilling 2
62 Input tray (x1) Q6211-60004 Holds blank pages that will be used for printing
• Plastic
• 10x9x2
Injection molding, drilling 2
63 Output tray (x1) Q5562-EXTENDER_OUTPUT Holds printed paper that has been exported
• Plastic
• 10x9x2
Injection molding 2
64 Chassis (x1) Q5562-CHASSIS Base of the printer, covers interior components
• Metal, plastic
• 17x8x5
Injection molding, die cast, drilling 3
65 Base roller (x1) Q5562-ADF_ROLLER_KIT Provides a bottom roller for the paper to slide on
• Plastic, metal
• 9x2x1
Injection molding, forging, drilling 3
66 Base cover (x1) Q5562-CHASSIS Allows for coverage of interior components
• Plastic, cork
• 9x4x0.25
Injection molding 1
67 Carriage Belt (x1) Q5562-BELT_CARRIAGE Moves carriage assembly across carriage rod
• Rubber
• 15x0.5
Injection molding 1
68 Encoder Strip (x1) Q5562-CHASSIS Encoder strip keeps track of the ink cartridge as it moves along the carrier rod.
• Plastic
• 16x0.5
Photochemical machining 1
69 Base Cover Holder(x1) Q5562-CHASSIS Holds base cover in place and decreases unwanted movement
• Metal
• 2x0.75
Die cast 1
70 Wire cover (x1) Q5562-CHASSIS Hold wires in place and keeps them from interfering with other components
• Plastic
• 5.5x0.5x0.1
Injection molding 1
71 Ink latch (x1) Q5562-CHASSIS Latches the ink carriage into place
• Plastic
• 2.2x0.75x0.5
Injection molding 1
72 Interior Casing (x1) Q5562-CHASSIS Used for assembly of casing
• Plastic
• 3x1x0.25
Injection molding 1
73 Bracket-L (x1) Q5562-BRACKET_LEFT Prevents unwanted movement by the carriage rod on the left side
• Metal
• 2.5x2x0.5
Die cast 1
74 Bracket-R (x1) Q5562-BRACKET_RIGHT Prevents unwanted movement by the carriage rod on the right side
• Metal
• 1.5x1x0.7
Die cast 1
75 Interior Casing (x1) Q5562-CHASSIS Used for assembly of casing
• Plastic
• 3x1x1.5
Injection molding 1
76 Pad Separator (x1) Q5562-PAD Allows for a separation of individual sheets of paper so more that one are not used at a time
• Plastic, foam
• 1x0.5x0.25
Injection Molding 2
77 Drop Cloth-R (x1) Q5562-CARRIAGE_ASSY Absorb ink spills
• Felt
• 8x4.5
78 Drop Cloth-L (x1) Q5562-CARRIAGE_ASSY Absorb ink spills
• Felt
• 8x3
79 Spring (x1) Q5562-SPRING Applies tension between print mechanism and base
• Rubber, metal
• 3x0.25x0.25
Forging 2
80 Paper Guide Springs (x4) Q5562-GUIDE_PAPER Supply the tension needed to press the paper against rollers
• Metal
• 1x0.25x0.25
Forging 2
81 Spring (x1) Q5562-SPRING_CMPRSN Supplies carriage belt tension to ensure stability
• Metal
• 1.25x0.25x0.25
Forging 2
82 Bracket (x1) Q5562-BRACKET_TENSION Used to contain the spring and prevent it from moving or becoming undone
• Metal
• 2x1.25x0.5
Die cast 1
83 Screw (x22) XA9-0917-000CN Hold components and parts of the product together
• Metal
• 0.75x0.25
84 Screw (x6) 0515-1912 Hold components and parts of the product together
• Metal
• 0.375x0.25
85 Screw (x12) 0515-0055 Hold components and parts of the product together
• Metal
• 0.25x0.1
86 Screw (x22) 0515-2139 Hold components and parts of the product together
• Metal
• 0.5x0.25
87 Screw (x7) RB1-0854-020CN Hold components and parts of the product together
• Metal
• 0.5x0.25
88 Screw (x10) RB2-5013-000CN Hold components and parts of the product together
• Metal
• 0.75x0.2
89 Screw (x2) RB1-8703-000CN Hold components and parts of the product together
• Metal
• 0.75x0.1
90 Scan reflector (x1) Q5562-SCANNER Helps the scanner to capture a better image
• Plastic, foam
• 14x9x0.25
Milling foam, subtractive 1

## Solid Modeled Assembly

The rollers are a vital part of the printer. They interact directly with the material flow of the paper as well as the energy flow being transferred through the motor and gears. The rollers are also one of the few important parts that can be easily seen without taking apart the whole printer. For these reasons we decided to create a solid modeled assembly of this part using the Pro/ENGINEER CAD software.

## Engineering Analysis

Engineering analysis can be a vital technique used in the design or testing phases of the design process. Utilizing this well-structured, logical process allows designers to optimize the product’s functionality, catch mistakes, and maximize its benefits. Engineering analysis is also effective during the testing stages of the design process. If a component or function is not working, not efficient, or even impeding the functions of other components, engineering analysis may be necessary to determine what needs to be done for improvement. Below is a description and analysis of one of the components of the HP Officejet 7310, the output paper tray.

This analysis will look at the development of the output paper tray from the HP Officejet 7310. Ideally, when designing a product, one objective is to minimize cost without losing any functionality. The function of the output paper tray is to catch and contain the paper that is exported from the printer. In this case, minimal cost directly corresponds to minimal material usage. The purpose of the engineering analysis below is to determine the least amount of material necessary for the tray to still hold the paper.

Problem Statement: Determine the shortest paper tray that can be installed that can still catch paper while preventing it from falling.

Diagram:

Assumptions:

• Acceleration due to gravity is equal to 9.81 m/s^2.
• There is no horizontal velocity (only looking at paper resting on tray, no initial movement).
• Standard paper size is 8.5 by 11 inches.
• Consider 20 sheets of paper on the tray as one point load.
• The paper tray is smooth (no friction) and even surface.
• The paper tray is parallel to the horizontal.
• Weight of one sheet of paper is .0045 kilograms.
• The center of gravity of the tray is located at the center.
• The center of gravity of the paper is located at the center.

Governing Equations:

Weight of 20 sheets of paper = (Weight of one sheet of paper)*20
ΣM = 0
ΣFy = 0

Summary: The analysis has been set up and can be easily performed by an engineer. When solving this problem, the engineer must make sure proper units are used and/or converted, since the assumptions contains both English and SI units. Intuitively, for the tray to hold the paper, it has to be as long as half the length of the paper; for this case, the length is 5.5 inches. This is the minimal length for the tray to hold the paper and prevent it from falling, but it may not be an ideal design for this product. If the tray is at its minimal length, the paper would barely stay on the tray. If this were the case, since paper is a flimsy material, it would be hanging off the tray, which is not aesthetically pleasing and thus unprofessional. It can be noted that the assumption was made so that there is no horizontal velocity involved when the paper is exported. In reality, the paper is being propelled out by the rollers, and with a minimized tray length, it may fall right off. In summary, saving money by reducing tray length is not worth the expense of losing visual appeal to customers.

## Design Revisions

If you were to think of an ideal printer, what would it be? Would it look nifty? Or would it have multiple functions? Either way, this brings up many thoughts about a printer’s features, functionality, ease of use, etc. Here we display 3 design revisions of ideas to improve the printer:

Figure 6: Touch screen control panel

Revision#1

The current control panel of the printer houses a sum total of 48 different buttons. This overwhelming amount of options can easily be fixed through a touch screen. The larger size and contrasting colors of the touch screen will make everything much easier to see. This touch screen will present the user with perhaps a starting point of only three options, and branch out to more specific choices from there. Through this sort of intuitive flow design, the user will be far less overwhelmed than when presented with 48 different options. Apart from addressing these societal factors and making the printer easier to use, the touch screen addresses global factors as well. By having one screen with no buttons or labels, the user can now change the language with far greater ease than before. Sales of the product will also increase, in large part due to the "coolness" factor a touch screen presents.

Figure 7: A colorful, customized printer

Revision #2

When someone wants to scan or fax, the last thing they would want is heavy physical labor. Lifting a heavy scanner head is discomforting and unappealing. The HP Officejet 7310 all-in-one printer is bulky in size, and what we want to do is slim it down. This can be made possible by placing the control panel onto the front of the fax head and thin out the scanner. By doing so, it will feel much lighter and be more compact. Now what else would happen when a bulky printer slims down other than feeling lighter? It loses weight and decreases material cost for manufacturing the product.

Revision#3

During the disassembly of our product, the outer shells were quite difficult to remove. The left and right outer shells, for example, took a lot of work to detach because of its function to assist the rotation of the scanning head. What we propose is to change the rotational mechanism to the back of the printer, which would allow easier accessibility to the internal parts of the printer for upgrading or maintenance. In addition, having easily detachable shell parts allows customers to customize the exterior design of the printer, This may include various colors, artwork, and style, which influences the aesthetics of marketing sales.