Developing apparatus for electrostatic photography
First Claim
1. A developing apparatus for electrostatic photography which feeds a developer from a reservoir to a predetermined developing station to develop a latent image electrostatically formed on a moving photoconductive member into a visible image, comprising:
- (a) a conveying means for conveying a roughly regulated volume of the developer from the reservoir toward the developing station, the developer being of a one component type which consists of a toner only; and
(b) a charging means for charging the toner to a predetermined polarity by frictional contact therewith while the toner is conveyed toward the developing station by the conveying means, whereby the charged toner is adhered to the charging means by electrostatic attraction to form an evenly charged toner layer having a relatively small uniform thickness.
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Accused Products
Abstract
A toner charging member to which a toner is conveyed and supplied is located in the vicinity of a photoconductive element which is to carry an electrostatic latent image thereon. The toner charging member charges the toner conveyed thereto to a selected polarity by friction, so that a thin uniformly charged toner layer is formed on the toner charging member. The charged toner particles are released from the toner layer on the charging member onto the latent image on the photoconductive element.
The toner charging member has an insulating member on its surface. A first discharging means is provided to dissipate accumulated charge on the insulator substantially simultaneously with its operation for removing toner particles from the charging member those which were not been supplied to the latent image. A second discharging means is disposed in a position downstream of a station where the first means removes the residual toner and upstream of a station where the toner is supplied to the charging member, in order to remove the charge from the insulator.
A number of microelectrodes are formed on the toner charging member or on its insulator to attain a prominent edge effect even when use is made of a one component type developer, which consists of toner particles alone.
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Citations
11 Claims
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1. A developing apparatus for electrostatic photography which feeds a developer from a reservoir to a predetermined developing station to develop a latent image electrostatically formed on a moving photoconductive member into a visible image, comprising:
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(a) a conveying means for conveying a roughly regulated volume of the developer from the reservoir toward the developing station, the developer being of a one component type which consists of a toner only; and (b) a charging means for charging the toner to a predetermined polarity by frictional contact therewith while the toner is conveyed toward the developing station by the conveying means, whereby the charged toner is adhered to the charging means by electrostatic attraction to form an evenly charged toner layer having a relatively small uniform thickness. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification