PROBLEM DEFINITION

"Design a Paper Cutting Machine which cuts paper into linear pieces. The Machine should be Safe (i.e. shock proof and sharp edges not exposed) and portable, affordable and easy to operate.The Machine should not consume area more than 4 sq.fts and should not cost more than Rs.5,000. The Machine should cut the paper into number of pieces as per the user's input, senses whether the paper is kept on the base or not and gives an indication if the paper fed for the task is not enough."

Table 3.1. List of Inputs and Outputs of the System

Inputs	Outputs
Paper	Paper pieces of desired size
Electrical Energy	Light Energy
Number of Pieces and Size	-

BLACK BOX REPRESENTATION

Fig. 1. Black Box Representation

LIST OF FUNCTIONS OF THE SYSTEM

Accept the number of paper pieces to be cut and their size.
Cut the paper into desired number of pieces and size.

FUNCTIONAL TREE

Fig. 2. Functional Tree

USER INTERACTION - SYSTEM BEHAVIOUR TABLE

Step No.	Accepting the Input
	User Action	System Behaviour
01	Turns on the Machine	--
02	Keeps the Paper on the Base	--
03	--	Senses the Paper kept
04	Gives the Input	--
05	--	Checks the validity of the Input
06	--	Starts Rolling the Paper
07	--	Cuts the paper
08	--	Gives an Indication to the User at the end
19	Collects the paper pieces	--
10	Turns off the machine	--

GLASS BOX REPRESENTATION

Fig. 3. Glass Box Representation

MORPHOLOGICAL CHART

Fig. 4. Morphological Chart

CONCEPTS GENERATED

Design Idea 1

Fig. 5. Design Idea 1

Design Idea 2

Fig. 6. Design Idea 2

Design Idea 3

Fig. 7. Design Idea 3

Design Idea 4

Fig. 8. Design Idea 4

OBJECTIVES IDENTIFIED

Safety and Portability
Affordable
Ease of Operation

Table 3.2 Assigned Weightage to the Objectives

Objectives	Weightage
Safety and Portability	9
Affordable	7
Ease of Operation	6

PUGH CHART

Objectives	Weightage	Design Idea 1	Design Idea 2	Design Idea 3	Design Idea 4
Safety and Portabilty	9	++	-	-	Datum
Affordable	7	++	+	--	Datum
Ease of Operation	6	0	0	0	Datum
+Score		32	+7	0	0
-Score		0	-9	-23	0
Total		32	-2	-23	0

The Best Concept selected is Design 1.

JUSTIFICATIONS

Design Idea	Objective	Score Given	Justifications
1	Safety and Portability	++	In this proposed design, there are no sharp edges exposed. Also, the machine is compact in size and easily portable
	Affordable	++	The design comprises of materials like Iron nails, Rollers and Razor blades which are available at comparatively low cost, than the components that the datum design uses.
	Ease of Operation	0	Like in the datum design, the user has to give the number of pieces to be cut and the length of the paper. No more human interference is needed
2	Safety and Portability	-	When compared to the Datum design, this design is more wide and thus is not easily portable.
	Affordable	+	This design uses a razor blade and a punching mechanism, which are easily available at low cost. But this design needs more number of rollers than the Datum design, which results in increase of manufacturing cost.
	Ease of Operation	0	Like in the datum design, the user has to give the number of pieces to be cut and the length of the paper. No more human interference is needed
3	Safety and Portability	-	The structure of the design is heavy and wide. Parts like Geneva wheel and the scissor may get detached from the body easily, if it isn't handled with care. Also, the sharp edges of the scissor are exposed, which may harm the user, while operation.
	Affordable	--	The parts used here, viz. Geneva wheel, Chain rollers, etc. are comparatively very expensive than those of the Datum design.
	Ease of Operation	0	Like in the datum design, the user has to give the number of pieces to be cut and the length of the paper. No more human interference is needed
4	Safety and Portability	0	Datum design is taken as the reference
	Affordable	0	Datum design is taken as the reference
	Ease of Operation	0	Datum design is taken as the reference