Powder transporting device, developing device, and image forming apparatus

A developing device comprising:

• a developer holding body that holds a developer;
• an agitating and supplying section that agitates and supplies the developer to the developer holding body;
• an agitating and transporting section that is arranged below the agitating and supplying section in a vertical direction and agitates and transports the developer;
• an upward transport section that is arranged on a downstream side in a transport direction of the agitating and transporting section and transports the developer transported from the agitating and transporting section to the agitating and supplying section above;
• and
• a speed increasing section that increases a rotation of a rotating shaft of any one of the agitating and transporting section, the agitating and supplying section, or the developer holding body and transmits the rotation to the upward transport section,
• wherein the speed increasing section has
• a first transmitting section that increases a drive force of the rotating shaft of the second agitating and transporting section and transmits the drive force to an intermediate shaft, and
• a second transmitting section that transmits the drive force of the intermediate shaft to the upward transport section.

A powder transporting device comprising:

• first agitating and transporting means for agitating and transporting powder;
• receiving means for receiving the powder from the first agitating and transporting means;
• second agitating and transporting means for being arranged below the first agitating and transporting means in a vertical direction and agitating and transporting the powder;
• upward transport means for being arranged on a downstream side in a transport direction of the second agitating and transporting means and transporting the powder transported from the second agitating and transporting means to the first agitating and transporting means above;
• and
• speed increasing means for increasing a rotation of a rotating shaft of any one of the first agitating and transporting means, the second agitating and transporting means, or the receiving means and transmitting the rotation to the upward transport means,
• wherein the speed increasing means has
• a first transmitting means that increases a drive force of the rotating shaft of the second agitating and transporting means and transmits the drive force to an intermediate shaft, and
• a second transmitting means that transmits the drive force of the intermediate shaft to the upward transport means.