Developing device with a developer regulator and a stopper

A developing device, comprising:

• a developer bearer including a magnetic field generator and configured to bear a developer containing toner and magnetic carriers, and convey the developer to a developing area by rotation;
• a developer supply passage entirely within the rotation area of a conveying screw, the developer supply passage having a side wall that is opposite of the developing bearer;
• a developer regulator outside of the developer supply passage;
• a stopper positioned between the developer supply passage and the developer regulator and between the developer supply passage and the developer bearer, the stopper configured to prevent the developer blocked by the developer regulator from moving to a surface of the developer bearer;
• and
• a supply path for passing the developer in the developer supply passage to the developer bearer, the supply path having a first width entirely between the stopper and an upper end of the side wall, wherein
• a line connecting a center of the developer bearer and a center of the conveying screw does not intersect the sidewall,
• the first width of the supply path is in a direction perpendicular to a direction of a rotation axis of the developer bearer,
• the first width is in a range of 6% or more and 10% or less of a circumference of an outer diameter of the developing bearer, and
• a second width of the stopper in the direction perpendicular to the direction of the rotation axis of the developer bearer is 6% or more and 11% or less of the circumference of the outer diameter of the developing bearer.

A developing device, comprising:

• a developer bearer including a magnetic field generator and configured to bear a developer containing toner and magnetic carriers, and convey the developer to a developing area by rotation;
• a developer supply passage entirely within the rotation area of a conveying screw, the developer supply passage having a side wall that is opposite of the developing bearer;
• a developer regulator outside of the developer supply passage;
• a stopper positioned between the developer supply passage and the developer regulator and between the developer supply passage and the developer bearer, the stopper configured to prevent the developer blocked by the developer regulator from moving to a surface of the developer bearer;
• and
• a supply path for passing the developer in the developer supply passage to the developer bearer, the supply path having a width entirely between the stopper and an upper end of the side wall, wherein
• the magnetic field generator includes at least five magnetic poles, the at least five magnetic poles including:
• a developer regulating pole facing the developer regulator,
• a developer scooping pole to draw the developer from the developer supply passage,
• a developer main pole disposed at the developing area,
• a first developer carrying pole disposed between the developer regulating pole and the developer main pole, and
• a second developer carrying pole disposed between the developer main pole and the developer scooping pole,
• the width of the supply path is in a direction perpendicular to a direction of a rotation axis of the developer bearer, and
• the width is in a range of 7% or more and less than 10% of a circumference of an outer diameter of the developing bearer.