PURPOSE: To obtain a laser printer device in which the meshing noise caused at a gear part provided at an adjacent part to a developing device is reduced by connecting the spout of a hollow muffler to a noise-proof cover.
CONSTITUTION: The muffler 13 is made of a material such as glass, plastic or plywood, has a hollow shape hermetically sealed and is provided with one spout 15 which is connected to the noise-proof cover 12. The cover 12 is made of a material such as plastic or plywood, has a shape covering the gear part 14 adjacent to a developing unit 11 and is provided with one socket to which the muffler 13 is connected. By connecting the spout 15 of the muffler 13 to the socket of the cover 12, the noise generated in the cover 12 is absorbed by the muffler 13. Since the noises generated by the gear of the gear part is mostly caused by the natural frequency of the gear, the meshing noise of the gear part is effectively absorbed by setting the specified frequency of muffle of this muffler in which the principal of a Helmholtz resonator is applied at the same value as the oscillation frequency.
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