SEED Guides Sub-System Specification - Planar Mechanisms < >

Planar mechanisms driven by an input which rotates at 'constant' angular velocity are grouped by output path. Electrical drives are also included.

Continuous
- slider crank                            Figure 4
- eccentric
- Scotch yoke                           Figure 5 (pure SHM)
- reversing actuator                  Figure 12 (long stroke)

with quick return
- Whitworth mechanism             Figure 6

with dwells
- cam & translating follower
- stepping motor or 'electronic cam' driving through rack & pinion or a power screw
- linear motor Indexing around a circular path

Unidirectional feed with absolute dwells
- ridged cam driving indexing turret                            Figure 10
- multi-disc cam driving indexing shaft
- 4-bar linkage driving through a                                Figure 2& 11
   'one-way' clutch
- Geneva mechanism                                                 Figure 7
- electronically controlled stepping motor

Continuous
- 4-bar linkage                                                        Figure 2
- Scotch yoke driving rack & pinion (pure SHM)           Figure 5

with quick return
- 4-bar linkage                                                        Figure 2
- eccentric                                                              Figure 13
- 6-bar linkage                                                        Figure 3

with hesitation
- disc or ridge cam driving swinging arm follower        Figure 8&9

with dwells
- electronically controlled stepping motor
- Œelectronic cam'