Image forming apparatus

The image forming apparatus addresses the challenge of DC voltage application by using a detection unit and mechanical switch to interrupt power to the fixing device, ensuring reliable operation and preventing component damage.

JP7875033B2Active Publication Date: 2026-06-17SHARP KK
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
SHARP KK
Filing Date
2022-06-02
Publication Date
2026-06-17

AI Technical Summary

Technical Problem

Existing image forming apparatuses face challenges in effectively suppressing the application of DC voltage, which can lead to malfunctions and potential damage to components like the heater in the fixing device due to improper triac operation.

Method used

The image forming apparatus incorporates a detection unit to identify DC power input, triggering a mechanical switch to interrupt the power supply to the fixing device, ensuring AC power is maintained, and includes a blocking member to prevent DC power from reaching critical components.

Benefits of technology

This configuration effectively prevents DC power from being applied to the fixing device, thereby reducing the risk of component failure and ensuring reliable operation by promptly cutting off power supply, even in the event of power supply malfunctions.

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Abstract

To suitably prevent application of DC voltage to an image forming apparatus.SOLUTION: An image forming apparatus comprises a driving unit, a detection unit, and a cut-off member. The driving unit is driven by AC power. The detection unit detects input of DC power to the driving unit. The cut-off member cuts off power supply to the driving unit based on a result of detection performed by the detection unit.SELECTED DRAWING: Figure 3
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