Image forming apparatus having abnormality detection unit for humidity sensor
a technology of humidity sensor and image forming apparatus, which is applied in the direction of electrographic process, process and machine control, instruments, etc., can solve the problem of hardly detected anomalies of sensors
Active Publication Date: 2019-12-26
KYOCERA DOCUMENT SOLUTIONS INC
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Benefits of technology
The image forming apparatus described in this patent has a humidity sensor, a fuser, a detection sensor, and an anomaly detection unit. The humidity sensor measures humidity, the fuser fixes toner images on paper, the detection sensors detect the timing of the paper sheet passing through the apparatus, and the anomaly detection unit detects any abnormal activity in the humidity sensor based on the sensor's measurements and the differences between the sheet lengths detected by the sensors. The technical effects of this invention are improved humidity control and detection of any abnormal humidity sensor activity, which can improve the quality and stability of the image forming apparatus.
Problems solved by technology
However, the aforementioned image forming apparatus performs the test mode and thereby determines whether anomaly occurs in the temperature and humidity sensors or not, and therefore, it is required for performing the test mode to prohibit printing operation.
In addition, in the aforementioned image forming apparatus, when a measurement value of the humidity falls into a fluctuation range corresponding to usual change of its environment, anomaly of the sensors is hardly detected.
Method used
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Embodiment Construction
[0010]Hereinafter, an embodiment according to an aspect of the present disclosure will be explained with reference to drawings.
[0011]FIG. 1 shows a side view that indicates an internal mechanical configuration of an image forming apparatus in an embodiment according to the present disclosure. The image forming apparatus shown in FIG. 1 is an apparatus including an electrophotographic printing function, such as a printer, a facsimile machine, a copier or a multi function peripheral.
[0012]The image forming apparatus in this embodiment includes a tandem-type color development device. This color development device includes photoconductor drums 1a to 1d, exposure devices 2a to 2d, and development units 3a to 3d. The photoconductor drums 1a to 1d are photoconductors of four colors: Cyan, Magenta, Yellow and Black.
[0013]The exposure devices 2a to 2d are devices that form electrostatic latent images by scanning and irradiating the photo conductor drums 1a to 1d with laser light, respectivel...
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In an image forming apparatus, a humidity sensor measures a humidity. A fuser fixes a toner image on a paper sheet. A first sheet detecting sensor is arranged in an upstream side of the fuser in a sheet transportation path, and detects passing timings of front and rear ends of the paper sheet. A second sheet detecting sensor is arranged in a downstream side of the fuser in a sheet transportation path, and detects passing timings of front and rear ends of the paper sheet. An anomaly detecting unit detects anomaly of the humidity sensor on the basis of (a) a ratio or difference between a first sheet length based on the passing timings detected by the first sheet detecting sensor and a second sheet length based on the passing timings detected by the second sheet detecting sensor and (b) a measurement value of the humidity sensor.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application relates to and claims priority rights from Japanese Patent Application No. 2018-120299, filed on Jun. 25th, 2018, the entire disclosures of which are hereby incorporated by reference herein.BACKGROUND1. Field of the Present Disclosure[0002]The present disclosure relates to an image forming apparatus.2. Description of the Related Art[0003]An image forming apparatus performs measurement of a temperature and a humidity near a photoconductor in a test mode using temperature and humidity sensors, and determines that anomaly occurs in the temperature and humidity sensors if a combination of measurement values of the temperature and the humidity falls into a predetermined range.[0004]However, the aforementioned image forming apparatus performs the test mode and thereby determines whether anomaly occurs in the temperature and humidity sensors or not, and therefore, it is required for performing the test mode to prohibit printing ...
Claims
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Login to View More IPC IPC(8): G03G21/20B65H1/26B65H7/02B65H43/00G01N33/00
CPCG05D22/00G03G21/203B65H2515/805G03G15/55G03G15/20G03G15/657G03G15/6573G03G2215/00721G03G2215/00776
Inventor KISHIMOTO, MITSUYUKI
Owner KYOCERA DOCUMENT SOLUTIONS INC