US 11,947,312 B2
Cooling structure for regulation blade of developing device
Minguk Go, Seongnam-si (KR); Horyul Lee, Seongnam-si (KR); Yoshihiko Ichikawa, Seongnam-si (KR); and Yunkyu Shim, Seongnam-si (KR)
Assigned to Hewlett-Packard Development Company, L.P., Spring, TX (US)
Appl. No. 18/027,618
Filed by Hewlett-Packard Development Company, L.P., Spring, TX (US)
PCT Filed Jun. 25, 2021, PCT No. PCT/US2021/039038
§ 371(c)(1), (2) Date Mar. 21, 2023,
PCT Pub. No. WO2022/081216, PCT Pub. Date Apr. 21, 2022.
Claims priority of application No. 10-2020-0132342 (KR), filed on Oct. 14, 2020.
Prior Publication US 2023/0393523 A1, Dec. 7, 2023
Int. Cl. G03G 21/00 (2006.01); G03G 15/08 (2006.01); G03G 21/20 (2006.01)
CPC G03G 21/206 (2013.01) [G03G 15/0812 (2013.01); G03G 15/0815 (2013.01); G03G 2221/1645 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A developing device comprising:
a developing roller;
a regulation blade to regulate a thickness of a toner layer attached to an outer circumference of the developing roller;
a blade bracket to support the regulation blade; and
an inner duct including an air supply port and extending in a longitudinal direction of the developing roller to form a flow path of air to cool the blade bracket, wherein the air supply port is located at a side of the inner duct in the longitudinal direction, and wherein a length of the air supply port is in a range of 25 to 50% of a length of the inner duct.