Developing device and image forming apparatus

1. A developing device comprising:

a developer carrier which carries a developer containing a toner and a carrier;

a magnet installed inside the developer carrier and including a plurality of magnetic poles in a rotational direction of the developer carrier;

a developing chamber which feeds the developer to the developer carrier;

a conveying member which conveys the developer of the developing chamber;

a regulating member which regulates an amount of the developer coated on the developer carrier; and

a guide portion which guides the developer to the developer carrier,

wherein the guide portion forms a part of the developing chamber between the regulating member and the conveying member and forms a buffer portion that temporarily contains the developer fed from the developing chamber between the regulating member and the guide portion, and

wherein, the guide portion has a facing surface opposing the developer carrier along a front surface of the developer carrier and a guiding surface which guides the developer from an upper edge of the guide portion to a downstream side of the facing surface in a rotational direction of the developer carrier, and the plurality of magnetic poles are disposed so that a magnetic direction effecting the carrier in the developer on the guiding surface is set in a direction to leave the guiding surface in a range from an upper portion toward a lower portion of the guiding surface.

2. The developing device according to claim 1 , wherein the guide portion has an inclination angle equal to or less than a slope of the regulating member.

3. The developing device according to claim 1 , wherein the guide portion has a planar facing surface that is opposite to the regulating member.

4. The developing device according to claim 1 , wherein the guide portion is configured so that a slope to a horizontal plane is reduced toward a developer conveying direction downstream.

5. The developing device according to claim 1 , wherein the guiding surface is a curved surface.

6. The developing device according to claim 1 , further comprising a developing container including an agitating chamber installed below the developing chamber and agitating the developer recovered from the developer carrier using a developer agitating member disposed there inside and a partition that partitions the developing container into the developing chamber and the agitating chamber, and the guide portion is integrally formed with the partition.

7. The developing device according to claim 1 , wherein at least one of the magnetic poles is installed more upstream than the regulating member and more downstream than the guide portion in relation to a rotational direction of the developer carrier.

8. The developing device according to claim 1 , wherein a conveying path of the developer formed between the guiding surface and a face opposing the guiding surface is formed narrower downstream of the developer conveying direction.