On what axis does the stitch forming mechanism of the Consew 206 RB sewing machine rotate, and what turns the hook?

The correct choice identifies the axis of rotation as horizontal, with the hook being driven by the hook driving shaft. In the Consew 206 RB sewing machine, the hook is a critical component that forms stitches by catching the thread that the needle has entered into the fabric. The horizontal alignment allows for a smooth movement that enables the hook to effectively come around the needle and catch the thread loop to create a lock stitch.

The hook driving shaft is specifically designed to provide the necessary rotational movement for the hook, ensuring that it accurately aligns with the needle's thread during the sewing process. The consistent and precise motion of this mechanism is essential for producing high-quality stitches and maintaining the machine’s performance.

In contrast, the other options describe mechanisms or components that do not directly relate to the axis of the hook’s rotation or its driving force. Understanding this mechanism is vital for troubleshooting sewing issues and maintaining the sewing machine effectively.