Rotary knob assembly capable of up-and-down motion

A rotary knob assembly capable of up and down movement, the rotary knob assembly comprising:

• a lower case in which an oil damper is disposed;
• a rotary sleeve rotatably disposed with respect to the lower case, the rotary sleeve comprising a connecting hole;
• a slide cam that is configured to move linearly with respect to the lower case, the slide cam comprising a pair of cam grooves which are inclined with respect to the lower case and a sleeve hole through which the rotary sleeve passes;
• an elastic member disposed between the slide cam and the lower case, the elastic member comprising a first end fixed to the lower case and a second end fixed to the slide cam;
• an up-and-down moving sleeve that is configured to move up and down with respect to the rotary sleeve, the up-and-down moving sleeve comprising a pair of up-and-down cams that are inserted in the pair of cam grooves of the slide cam;
• a rotary knob that is rotatably connected to the up-and-down moving sleeve, the rotary knob comprising a connecting member that is configured to be inserted in the connecting hole of the rotary sleeve;
• and
• an upper case connected to an upper side of the lower case, the upper case being configured to limit up and down movement of the rotary knob,
• wherein a moving speed of the slide cam is controlled by the oil damper.