Claims
- 1. An image recording apparatus capable of forming an image freely on the front side and the backs side of a recording sheet, comprising:
- an image carrier for carrying an electrostatically formed latent image representative of an image to be recorded;
- image forming means for forming the latent image on said image carrier as a non-inverted image or an inverted image;
- developing means for developing latent images formed on said image carrier by said image forming means to produce a primary toner image;
- an intermediate transfer body located to face said image carrier for moving the recording sheet between said intermediate transfer body and said image carrier;
- intermediate transferring means for transferring said primary toner image to said intermediate transfer body to form a secondary toner image on said intermediate transfer body;
- polarity inverting means for inverting a polarity of said primary toner image such that polarities of said primary and secondary toner images are different from each other;
- discharge removing means for dissipating charge of said primary toner image;
- primary toner image transferring means for transferring said primary toner image to the recording sheet from said image carrier; and
- secondary toner image transferring means for transferring said secondary toner image to the recording sheet from said intermediate transfer body,
- said intermediate transferring means and said primary toner image transferring means being constituted by a single charging unit.
- 2. An image recording apparatus as claimed in claim 1, in which said intermediate transfer body comprises a belt.
- 3. An image recording apparatus as claimed in claim 2, in which said single charging unit is disposed between the upper, and lower runs of the belt.
- 4. An image recording apparatus as claimed in claim 2, further comprising fixing means for fixing a toner image carried on the recording sheet, said belt serving as means for transporting the recording sheet with the toner image to the fixing means.
- 5. An image recording apparatus as claimed in claim 4, in which said fixing means comprises a pair of rollers which face each other.
- 6. An image recording apparatus as claimed in claim 5, in which each of said of rollers comprises a heat roller.
- 7. An image recording apparatus capable of forming an image freely on the front side and the back side of a recording sheet, comprising:
- an image carrier for carrying an electrostatically formed latent image representative of an image to be recorded;
- image forming means for forming the latent image on said image carrier as a non-inverted image or an inverted image;
- developing means for developing latent images formed on said image carrier by said image forming means to produce a primary toner image;
- an intermediate transfer body located to face said image carrier for moving the recording sheet between said intermediate transfer body and said image carrier;
- intermediate transferring means for transferring said primary toner image to said intermediate transfer body to form a secondary toner image on said intermediate transfer body;
- polarity inverting means for inverting a polarity of said primary toner image such that polarities of said primary and secondary toner images are different from each other;
- discharge removing means for dissipating charge of said primary toner image;
- primary toner image transferring means for transferring said primary toner image to the recording sheet from said image carrier; and
- secondary toner image transferring means for transferring said secondary toner image to the recording sheet from said intermediate transfer body,
- said intermediate transferring means, said primary toner image transferring means and second secondary toner image transferring means being constituted by a single charging unit.
- 8. An image recording apparatus as claimed in claim 7, in which said intermediate transfer body comprises a belt.
- 9. An image recording apparatus as claimed in claim 8, in which said single charging unit is disposed between the upper and lower runs of the belt.
- 10. An image recording apparatus as claimed in claim 8, further comprising fixing means for fixing a toner image carried on the recording sheet, said belt serving as means for transporting the recording sheet with the toner image to the fixing means.
- 11. An image recording apparatus as claimed in claim 10, in which said fixing means comprises a pair of rollers which face each other.
- 12. An image recording apparatus as claimed in claim 11, in which each of said pair of rollers comprises a heat roller.
Priority Claims (3)
Number |
Date |
Country |
Kind |
63-306065 |
Dec 1988 |
JPX |
|
1-37081 |
Feb 1989 |
JPX |
|
1-130466 |
May 1989 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/443,434, filed on Nov. 30, 1989, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (3)
Number |
Date |
Country |
2062591 |
Jul 1971 |
DEX |
1368456 |
Sep 1974 |
GBX |
8702792 |
May 1987 |
WOX |
Non-Patent Literature Citations (1)
Entry |
Ronald A. Andrews, "Single Pass Duplex in Electronic Systems", Jan./Feb. 1984, Xerox Disclosure Journal, vol. 9, No. 1. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
443434 |
Nov 1989 |
|