Image forming apparatus having a high-voltage unit malfunction detecting function
First Claim
Patent Images
1. An image forming apparatus comprising:
- a photosensitive member;
means for charging the photosensitive member;
means for forming an electrostatic latent image on the photosensitive member charged by the charging means;
reversal development means for developing said latent image with a toner of the same polarity as the latent image;
means for transferring the toner image from the photosensitive member to a paper;
a sensing means for detecting the amount of the toner adhering to the photosensitive member or on the paper; and
means for detecting a malfunction in the charging means or in the transferring means based on an output from the sensing means.
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Abstract
An image forming apparatus includes a rotatable photosensitive member and is adpated to form an image on a paper by steps of charging the photosensitive member with a main charger, exposing to form an electrostatic latent image, developing the latent image with a toner, transferring the toner image to a paper with transferring charger. Furthermore the apparatus includes a sensor to detect the amount of the toner adhering to the photosensitive member or to the paper so as to detect a malfunction in the main charger or in the transferring charger.
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Citations
13 Claims
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1. An image forming apparatus comprising:
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a photosensitive member; means for charging the photosensitive member; means for forming an electrostatic latent image on the photosensitive member charged by the charging means; reversal development means for developing said latent image with a toner of the same polarity as the latent image; means for transferring the toner image from the photosensitive member to a paper; a sensing means for detecting the amount of the toner adhering to the photosensitive member or on the paper; and means for detecting a malfunction in the charging means or in the transferring means based on an output from the sensing means.
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2. An image forming apparatus comprising:
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a photosensitive member; means for charging the photosensitive member; means for forming an electrostatic image on the photosensitive member charged by the charging means; reversal development means for developing said latent image with a toner of the same polarity as the latent image; means for transferring the toner image from the photosensitive member to a paper; a sensing means for detecting the amount of the toner present in the area of the photosensitive member on which the latent image is not formed; means for comparing an output from the sensing means with a predetermined value; and means for detecting a malfunction in the charging means based on an output from the comparing means. - View Dependent Claims (3)
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4. An image forming apparatus comprising:
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a photosensitive member; means for charging the photosensitive member; means for forming an electrostatic latent image on the photosensitive member charged by the charging means; reversal development means for developing said latent image with a toner of the same polarity as the latent image; means for transferring the toner image from the photosensitive member to a paper; a sensing means for detecting the amount of the toner present in the area of the photosensitive member from which the toner image has been transferred to the paper; means for comparing an output from the sensing means with a predetermined value; and means for detecting a malfunction in the transferring means based on an output from the comparing means. - View Dependent Claims (5)
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6. An image forming apparatus comprising:
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a photosensitive member; means for charging the photosensitive member; means for forming an electrostatic latent image on the photosensitive member charged by the charging means; reversal development means for developing said latent image with a toner of the same polarity as the latent image; means for transferring the toner image from the photosensitive member to a paper; a sensing means for detecting the amount of the toner present in the area of the paper on which the toner image is not transferred; means for comparing an output from the sensing means with a predetermined value; and means for detecting a malfunction in the charging means based on an output from the comparing means. - View Dependent Claims (7)
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8. An image forming apparatus comprising:
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a photosensitive member; means for charging the photosensitive member; means for forming an electrostatic latent image on the photosensitive member charged by the charging means; reversal development means for developing said latent image with a toner of the same polarity as the latent image; means for transferring the toner image from the photosensitive member to a paper; a sensing means for detecting the amount of the toner present in the area of the paper on which toner image has been transferred; means for comparing an output from the sensing means with a predetermined value; and means for detecting a malfunction in the transferring means based on an output from the comparing means. - View Dependent Claims (9)
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10. An image forming apparatus comprising:
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a photosensitive member; means for charging the photosensitive member; means for forming an electrostatic latent image on the photosensitive member charged by the charging means; reversal development means for developing said latent image with a toner of the same polarity as the latent image; means for transferring the toner image from the photosensitive member to a paper; a sensing means for detecting the amount of the toner adhering to the photosensitive member; means for comparing an output from the sensing means with a predetermined value; and means for detecting a malfunction in the charging means based on a first output signal from the comparing means and for detecting a malfunction in the transferring means based on a second output signal from the comparing means. - View Dependent Claims (11)
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12. An image forming apparatus comprising:
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a photosensitive member; means for charging the photosensitive member; means for forming an electrostatic latent image on the photosensitive member charged by the charging means; reversal development means for developing said latent image with a toner of the same polarity as the latent image; means for transferring the toner image from the photosensitive member to a paper; a sensing means for detecting the amount of the toner adhering to the paper; means for comparing an output from the sensing means with a predetermined value; and means for detecting a malfunction in the charging means based on a first output signal from the comparing means, and for detecting a malfunction in the transferring means based on a second output signal from the comparing means. - View Dependent Claims (13)
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Specification