Claims
- 1. In a development system including a developer transport adapted for depositing developer material on an imaging surface having an electrostatic latent image thereon, comprising:a housing defining a chamber storing a supply of developer material comprising carrier and toner; a donor member, mounted partially in said chamber and spaced from the imaging surface, for transporting developer on an outer surface thereof to a region opposed from the imaging surface, said donor member having a magnetic assembly having a plurality of poles, a sleeve, enclosing said magnetic assembly, rotating about said magnetic assembly; and a vibrating member positioned between said magnetic assembly and said sleeve at a predefined position around said donor roll, said vibrating member fluidizing said developer material on said donor member to prevent developer bed freezing, to prevent long-range carrier bead chain formation, and to smooth developer bed height-banding on said donor member before a development zone.
- 2. The development system of claim 1, wherein the carrier comprises soft carrier material.
- 3. The development system of claim 1, wherein said magnetic assembly has a pole spacing between 1 mm to 1 cm.
- 4. The development system of claim 3, wherein said sleeve has a thickness between 100 to 350 microns.
- 5. The development system of claim 1, further comprising a plurality of trim bars positioned about said donor member.
- 6. The development system of claim 1, wherein said predefine developer bed height is between five and twenty carrier bead diameters, with a preferred value being at ten carrier bead diameters.
- 7. The development system of claim 1, wherein said donor member is rotated between 200 to 4000 rpm.
- 8. The development system of claim 1, further comprising means for applying an oscillating electric field between said donor member and imaging surface.
- 9. The development system of claim 1, wherein said vibrating member vibrates between 1 and 100 KHz.
BACKGROUND AND SUMMARY OF THE PRESENT INVENTION
Cross reference is made to the following applications filed concurrently herewith: U.S. patent application Ser. No. 09/995,670, entitled “Apparatus and Method for Non-Interactive Magnetic Brush Development,” by Robert J. Meyer et al.; U.S. patent application Ser. No. 09/995,655, entitled “Apparatus and Method for Non-Interactive Magnetic Brush Development,” by Robert J. Meyer et al.; U.S. patent application Ser. No. 09/995,628, entitled “Developer Composition for Non-Interactive Magnetic Brush Development,” by Robert J. Meyer et al.; U.S. patent application Ser. No. 09/995,658, entitled “Developer Composition for Non-Interactive Magnetic Brush Development,” by Robert J. Meyer et al.; U.S. patent application Ser. No. 09/995,632, entitled “Developer Composition for Non-Interactive Magnetic Brush Development,” by Robert J. Meyer et al., the disclosure(s) of which are totally incorporated herein.
US Referenced Citations (18)
Foreign Referenced Citations (2)
Number |
Date |
Country |
62095565 |
May 1987 |
JP |
62095566 |
May 1987 |
JP |