Option 1:  Gear-Pairs with Fixed Centres

A Gear-Pair in which each gear has a Fixed Centre:

Both gears rotate about their own centres.
The centres are fixed in one Part - usually the Base-Part, but not necessarily.

Applications

Gears with fixed-centres are:

Simple Gear-Pairs (also known as Parallel or Standard Gears)

Use gears with fixed-centres to:

Increase or decrease the Torque and Speed of a shaft
Change the rotational direction of a shaft
Change the position of a shaft

Combine Gears with a mechanism to get:

Coupler-Curves: from Geared Four-bar and Geared- Five-bars
Function-Generation: from Geared Four-bar and Five-bars

Basic Arrangement of Simple Gear-Pair

Example Simple Gear-Pair - Simple External Gears

Simpe Gear Pair - External Mesh

External Mesh

In the schematics:

Gear 1 1s-red : rotates on a 'fixed-centre'

Gear 2 2s : rotates on a 'fixed-centre'

Line-of-centre 3s : a Line between the two 'fixed-centres'. It is a Line in the Base-Part.

Example Simple Gear-Pair - Simple External Gears

Simple Gear Pair - Internal Mesh

Internal Mesh

In the schematics:

Gear 1 1s-red : rotates on a 'fixed-centre'

Gear 2 2s : rotates on a 'fixed-centre'

Line-of-centre 3s : Line between two 'fixed-centres'. It is a Line in the Base-Part.

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