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Special Purpose Mechanisms

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Slider-crank mechanisms. Straight-line mechanisms. Scotch-yoke mechanism. Cams, pulleys, etc. ... crank. r. Special Purpose Mechanisms. Topic XVIII ... – PowerPoint PPT presentation

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Title: Special Purpose Mechanisms


1
Special Purpose Mechanisms
  • There are a number of special geometries of
    mechanisms that are used to perform specific
    purposes. Many have been discussed during the
    semester. A few more are discussed here.

2
Parallel Mechanisms
  • Parallel motion mechanism

3
Parallel Mechanisms (cont.)
  • Parallel stage mechanism

4
Parallel Mechanisms (cont.)
  • Pantograph mechanisms

5
Parallel Mechanisms (cont.)
  • Nuremberg Scissors

6
Rotary to Linear Motion
  • Wheel system (bicycle an example)
  • Rack and pinion
  • Lead screw
  • Slider-crank mechanisms
  • Straight-line mechanisms
  • Scotch-yoke mechanism
  • Cams, pulleys, etc.

7
Rotary to Linear (cont.)

8
Scotch-Yoke Mechanism

9
Chebyshev Straight-Line Mech.

10
Roberts Straight Line Mechanism
r3 0.5r1
11
Intermittent Motion Mechanisms
  • Geneva Wheel

12
Intermittent Motion Mech. (cont.)
  • Intermittent gears

13
Intermittent Motion (cont.)
  • Linear Geneva Mechanism

14
Ratcheting Mechanisms
  • Allow motion in one direction only

15
Mechanism Stability
A bistable mechanism has two stable equilibrium
positions
16
Switching Mechanisms

17
Other Bistable Mechanism Configurations
18
Infinite Variable Speed Drives

19
Mechanism Resources
  • Mechanism resource books
  • Research journals
  • Trade magazines
  • Thomas Register
  • Vender information and catalogs
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