reading a machine renata brenner the design machine made - stamped/pressed parts/molded metal &...
Post on 15-Jan-2016
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Reading a Machine
Renata Brenner
The Design• Machine made - stamped/pressed parts/molded• Metal & Plastic (Bakelite) Sturdy• Interchangeable/universal – fits multiple machines• Gears, ratchet, ball bearings• Interchangeable cams –cast• Adjustable
– Interchangeable cams – changed by hand– Bight adjustment – stitch width – depress lever to slide– Cloth clamp – position
• Install w/ screwdriver• Lubricate • Cloth clamp – toothed surface
The Design• Power input is through fork arm – from
needle clamp• Drives ratchet
– Advances material through path determined by cam on needle upstroke
– Moves material back & forth perpendicular to path of needle on needle upstroke
– Stripping arm holds cloth down on needle upstroke
– Holds material stationary on needle downstroke
• Can be advanced manually with knob• Need to cover/retract feeddogs
The Design
What were the designers were trying to accomplish?
What were the designers were trying to accomplish?
• Sewing machine stitches in a straight line
• Create a buttonhole – opening with bound edges (retain shape -prevent fraying)
What is the object designed to do?
Is it part of a system?
If so, where and how does it fit in?
• Screws onto machine presser bar
• Fits onto needle clamp
What is the expected input and where will its output go?
• Device holds and moves fabric in synchrony with the sewing machine needle in order to create a buttonhole
Who would use it?
What they were assuming about the people who would use it?
• Knew how to sew
• Read instructions/diagrams
• Use a screwdriver
• Reasonably mechanical
What is that person expected to know?
• Parts and Functions• How to perform basic
tasks with the sewing machine
What is she or he supposed to be able to learn?
• How to install
• Position/adjust
• Choose thread/size/style based on fabric/button
• Adjust width
• Maintenance: open & lubricate
Phylogeny
Sew Long!