Mita Industrial Co., Ltd.

Yoshiyuki Uehara

Takeshi Watanabe

Kikunosuke Tsuji

Hiroshi Kusumoto

Hiroshi Kajita

Setsuo Hori

Koji Ujino

Satoshi Kuroyanagi

Masahiko Sakae

A developing apparatus includes a developing roller which conveys developer on the surface thereof by the rotation in a predetermined direction. The developer conveyed thereon to develop a latent image formed on an image-holding device. A supply roller rotates keeping contact with the developing roller and by the rotation of which the developer is supplied to the developing roller. A regulating member regulates the amount of the developer to be conveyed on the surface of the developing roller. The supply roller is so disposed that the axis thereof is positioned lower than that of the developing roller while the top thereof is also positioned lower than that of the developing roller.

Developing apparatus with a developer regulating member

An electrostatic copying apparatus conveys a copying paper sheet through a copying paper conveying passage thereby to form an image on one surface of the sheet, selectively introduces it into a copying paper returning passage, returns it to a copying paper re-sending device through the returning passage, and again feeds it into the paper conveying passage from the re-sending device so as to form an image on the other surface of the paper sheet. The paper re-sending device includes a copying paper receiving stand for receiving copying paper sheets and a delivery device disposed above the receiving stand. The delivery device is selectively maintained in a non-operating state in which it moves away from the copying paper received on the receiving stand, a first operating state in which it acts relatively weakly on the copying paper received on the receiving stand, and a second operating state at which it acts relatively strongly on the copying paper received on the receiving stand. A mechanism prevents feeding of papers in the superposed state, and a copying paper detecting mechanism, applicable to various types of electrostatic copying apparatus, permits effective detection of the arrival of a copying paper at the paper re-sending device.

Electrostatic copying apparatus

A toner image fixing device includes a driven fixing roller drivingly connected to a driving source and a rotatably mounted follower fixing roller. The follower fixing roller is mounted on a movable supporting member which is mounted for free movement between a contacting position at which the follower fixing roller is kept in press contact with the driven fixing roller and a non-contacting or non-pressing position at which the follower fixing roller is kept out of press contact with the driven fixing roller. A press-contacting control mechanism selectively holds the movable supporting member at the contacting position and the non-contacting position. The press-contacting control mechanism includes a positioning member connected to the movable supporting member via a spring and an actuating device for selectively holding the positioning member at an operating position and a non-operating position. When the positioning member is moved to the operating position, the movable supporting member is moved to the contacting position via the spring. When the positioning member is moved to the non-operating position, the movable supporting member is moved to the non-operating position via the spring.

Toner image fixing device

Growing community of inventors

Sakai, Japan

Yoshiyuki Uehara