Image forming machine
First Claim
1. An image forming machine comprising:
- image bearing means moved sequentially through a charging zone, an exposure zone, a development zone, a transfer zone, and a cleaning zone;
charging means for charging the image bearing means in the charging zone;
exposure means for selectively static-eliminating the image bearing means in the exposure zone to form an electrostatic latent image on the image bearing means;
reversal development means for developing the electrostatic latent image into a toner image in the development zone;
transfer means for transferring the toner image on the image bearing means onto an image receiving member in the transfer zone; and
cleaning means for removing a toner remaining on the image bearing means in the cleaning zone after transfer, the transfer means including a rotationally driven transfer belt, and transfer voltage applicator means for applying a transfer voltage to a back side of the transfer belt, and wherein the charging means charges the image bearing means over a predetermined effective charging width, the transfer voltage applicator means applies the transfer voltage to the transfer belt over a predetermined effective transfer width, a face side of the transfer belt is brought into contact with the image bearing means via the image receiving member and directly over a predetermined effective contact width, and the effective contact width is larger than the effective charging width and larger than the effective transfer width.
1 Assignment
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Accused Products
Abstract
An image forming machine comprising image bearing means, charging means, exposure means, reversal development means, transfer means, and cleaning means. The transfer means includes a rotationally driven transfer belt, and transfer voltage applicator means for applying a transfer voltage to the back side of the transfer belt. The transfer voltage applicator means applies the transfer voltage to the transfer belt over a predetermined effective transfer width. The face side of the transfer belt is brought into contact with the image bearing means via an image receiving member and directly over a predetermined effective contact width. The effective contact width is larger than an effective charging width and larger than the effective transfer width.
20 Citations
22 Claims
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1. An image forming machine comprising:
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image bearing means moved sequentially through a charging zone, an exposure zone, a development zone, a transfer zone, and a cleaning zone;
charging means for charging the image bearing means in the charging zone;
exposure means for selectively static-eliminating the image bearing means in the exposure zone to form an electrostatic latent image on the image bearing means;
reversal development means for developing the electrostatic latent image into a toner image in the development zone;
transfer means for transferring the toner image on the image bearing means onto an image receiving member in the transfer zone; and
cleaning means for removing a toner remaining on the image bearing means in the cleaning zone after transfer, the transfer means including a rotationally driven transfer belt, and transfer voltage applicator means for applying a transfer voltage to a back side of the transfer belt, and wherein the charging means charges the image bearing means over a predetermined effective charging width, the transfer voltage applicator means applies the transfer voltage to the transfer belt over a predetermined effective transfer width, a face side of the transfer belt is brought into contact with the image bearing means via the image receiving member and directly over a predetermined effective contact width, and the effective contact width is larger than the effective charging width and larger than the effective transfer width. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An image forming machine comprising:
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image bearing means moved sequentially through a charging zone, an exposure zone, a development zone, a transfer zone, and a cleaning zone;
charging means for charging the image bearing means in the charging zone;
exposure means for selectively static-eliminating the image bearing means in the exposure zone to form an electrostatic latent image on the image bearing means;
reversal development means for developing the electrostatic latent image into a toner image in the development zone;
transfer means for transferring the toner image on the image bearing means onto an image receiving member in the transfer zone; and
cleaning means for removing a toner remaining on the image bearing means in the cleaning zone after transfer, the transfer means including a rotationally driven transfer belt, and transfer voltage applicator means for applying a transfer voltage to a back side of the transfer belt, and wherein the reversal development means develops the image bearing means over a predetermined effective development width, the transfer voltage applicator means applies the transfer voltage to the transfer belt over a predetermined effective transfer width, a face side of the transfer belt is brought into contact with the image bearing means via the image receiving member and directly over a predetermined effective contact width, and the effective contact width is larger than the effective development width and larger than the effective transfer width. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An image forming machine comprising:
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image bearing means moved sequentially through a charging zone, an exposure zone, a development zone, a transfer zone, and a cleaning zone;
charging means for charging the image bearing means in the charging zone;
exposure means for selectively static-eliminating the image bearing means in the exposure zone to form an electrostatic latent image on the image bearing means;
reversal development means for developing the electrostatic latent image into a toner image in the development zone;
transfer means for transferring the toner image on the image bearing means onto an image receiving member in the transfer zone; and
cleaning means for removing a toner remaining on the image bearing means in the cleaning zone after transfer, the transfer means including a rotationally driven transfer belt, and transfer voltage applicator means for applying a transfer voltage to a back side of the transfer belt, and wherein the cleaning means removes the toner remaining on the image bearing means over a predetermined effective cleaning width, the transfer voltage applicator means applies the transfer voltage to the transfer belt over a predetermined effective transfer width, a face side of the transfer belt is brought into contact with the image bearing means via the image receiving member and directly over a predetermined effective contact width, and the effective contact width is larger than the effective cleaning width and larger than the effective transfer width. - View Dependent Claims (16, 17, 18, 19)
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20. An image forming machine comprising:
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image bearing means moved sequentially through a charging zone, an exposure zone, a development zone, a transfer zone, and a cleaning zone;
charging means for charging the image bearing means in the charging zone;
exposure means for selectively static-eliminating the image bearing means in the exposure zone to form an electrostatic latent image on the image bearing means;
reversal development means for developing the electrostatic latent image into a toner image in the development zone;
transfer means for transferring the toner image on the image bearing means onto an image receiving member in the transfer zone; and
cleaning means for removing a toner remaining on the image bearing means in the cleaning zone after transfer, the transfer means including a rotationally driven transfer belt, and transfer voltage applicator means for applying a transfer voltage to a back side of the transfer belt, and wherein the charging means includes a corona discharger for charging the image bearing means over a predetermined effective charging width, and a pair of spacing setting rollers rotatably mounted on the corona discharger and brought into contact with the image bearing means on both sides of the effective charging width, and a length between outside ends of the pair of spacing setting rollers is larger than the effective charging width and smaller than the effective contact width. - View Dependent Claims (21, 22)
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Specification