How to express the rotation direction of connecting rod in the appendix of patent application specification

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1. How to describe that the rotation of (1) finally leads to the rotation of (4) through (2) and (3)? How to write the direction of rotation?

1 has a first axis, and 4 has a second axis. When working, 1 rotates along the first rotation axis, driving 2 to rotate, being driven by 2, 3 rotating at an angle relative to 2, and finally 3 driving 4 to rotate along the second rotation axis. In this embodiment, the first rotation axis is perpendicular to the second rotation axis.

2. Can this icon (2) be used to represent the bevel gear in the attached drawings?

can

3. Do you need to specify what (1), (2) and (3) stand for respectively, and write them in the instruction or the attached drawings of the instruction?

Specifications can be defined as follows: a XX device includes 1, 2 and 1 rotating connection, 3 and 2 rotating connection, and 4 and 3 rotating connection. If there is a definition in the specification, the drawing description is not required.