Writing tool with anti-drying device

A writing tool with an anti-dry device comprising:

• a penholder (110), a pen tip (1) provided inside the penholder (110), an ink cartridge (130) and a pressing rod (150), wherein the pen tip (1) is connected to a lower portion of the ink cartridge (130), the pressing rod (150) is located on an upper portion of the ink cartridge (130) and configured to drive the ink cartridge (130) moving through the penholder (110), characterized in that:
• an inner wall of a lower portion of the penholder (110) is provided with limiting protrusions (114), a mounting groove (113) and a spring mounting surface (115), wherein the limiting protrusions (114) is located above the spring mounting surface (115) and the mounting groove (113) is located between the limiting protrusions (114) and the spring mounting surface (115);
• fastening lifting protrusions (133) and an anti-off clamping surface (134) are provided on an outer wall of the ink cartridge (130) and the anti-off clamping surface (134) is located above the fastening lifting protrusions (133);
• and the writing tool is provided with an anti-drying device (200) including a switch sleeve (210), a lifting cap (220), a tapping spring (214), a rotatable sealing cap (230), a sealing pad (240) and a supporting spring (244);
• wherein the switch sleeve (210) is inserted into the penholder (110), an upper portion of the switch sleeve (210) is respectively provided with an elastic part on both sides, and the switch sleeve (210) is provided with two lifting grooves which respectively extends along the elastic parts (211);
• an anti-press protrusion (211a) fitting with the anti-off clamping surface (134) is provided inside an upper end of each elastic part (211) and a locking protrusion (211b) mating with the limiting protrusion (114) is provided outside the upper end of each elastic part (211), and a lower portion of the switch sleeve (210) is formed a rotating groove (213) on both sides;
• the lifting cap (220) is inserted into the switch sleeve (210), wherein an upper portion of the lifting cap (220) is provided with a supporting protrusion (221) on both sides and a lower portion of the lifting cap (220) is provided with a rotating shaft (222) on both sides, the fastening lifting protrusions (133) and the supporting protrusions (221) are located up and down and respectively inserted into the lifting grooves on corresponding sides and the supporting protrusions (221) are inserted into the mounting groove (113);
• the tapping spring (214) is inserted into switch sleeve (210) and located between the lifting cap (220) and the ink cartridge (130);
• the rotatable sealing cap (230) includes a closing surface (231) and a rotating support part (232) provided on each side of the closing surface (231), the rotating support part (232) is provided with a shaft hole (233) and a rotating operation protrusion (234) which is eccentrically located at one side of the shaft hole (233), and the rotating shaft (222) is inserted into the corresponding shaft hole (233) and the rotating operation protrusion (234) is inserted into the rotating groove (213);
• the sealing pad (240) is provided with an access hole (241) allowing the pen tip (1) to extend out or be retracted, and is located below the switch sleeve (210), and the supporting spring (244) is arranged between the sealing pad (240) and the spring mounting surface (115), and the access hole (241) is opened and closed by the rotation of the rotatable sealing cap (230).