Liquid painting instrument with valve control

A liquid painting instrument comprising:

• an outer shaft;
• a painting member connected to a front end of said outer shaft;
• and
• an inner shaft for containing a liquid therein, said inner shaft being axially and movably engaged in said outer shaft, further said inner shaft including a neck portion having a non-circular cross-section and provided on a portion near to the front end of the inner shaft,
• a control wall having a passage hole that allows the neck portion of said inner shaft to pass therethrough to a first position in a circumferential phase while preventing said neck portion from passing to other positions in the circumferential phase, the control wall being located in front of the neck portion in an unknocked state, and
• a plurality of projections located on a front face of the neck portion, each of the plurality of projections having a cam face that slidably contacts a rear face of the control wall so as to displace said inner shaft rearward relative to a fixed position where a valve connected between said inner shaft and said painting member is closed when said inner shaft is rotated so as to prevent said neck portion from passing through the passage hole;
• and
• a valve connected between said inner shaft and said painting member, said valve being openable so that the liquid may be supplied from said inner shaft to said painting member when said inner shaft advances in position relative to said outer shaft.