JPH0131498Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sound insulation device for a laser printer that prevents noise from a blower used in the laser printer from directly exiting the printer.

Laser printers differ from impact printers in that they print by striking type with a printing hammer through paper and an ink ribbon. One of the features of laser printers is low noise, as there is no striking sound from the printing hammer during printing. However, as shown in FIG. 1, in the conventional laser printer, the blower 6 for sucking the toner remaining on the photosensitive drum and the blower 7 for adsorbing the paper onto the fixing hot plate were constructed only from the pillar 13. Since the blowers 6 and 7 are installed inside the printer housing, the noise from the blowers 6 and 7 is directly emitted to the outside of the printer, resulting in a noise comparable to or greater than the impact sound of an impact printer. Therefore, an expensive silencer 1 is installed at the exhaust port of each blower 6, 7.
1 was generally implemented to reduce noise.

The laser printer shown in Figure 1 is an ultra-high-speed printing device that prints approximately 15,000 lines per minute, and its width is over 3 meters.
7 and the power supply control unit or the stacker unit (both not shown) in which the printing paper is folded and stored, so that the exhaust air from the blowers 6 and 7 does not have an adverse effect on the power supply control unit or the stacker unit. Since the number of columns was small, the support column 13 alone was sufficient.

However, in the case of a small laser printer with a width of 1.4 meters, for example, the distance between the blowers 6 and 7 and the power supply control section or the stacker section becomes small, and the exhaust from the blowers 6 and 7 is forced to the power supply control section or the stacker section. This may affect the operation of these devices.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional technology, utilize the structure of the printer housing to achieve soundproofing in an inexpensive manner, take advantage of the low-noise characteristics of laser printers, and enable miniaturization of laser printers. It is to be.

In this invention, the blower is housed in a box surrounded by a wall that was created to increase the rigidity of the printer casing, and the structure of the casing is devised so that one side is shaped like a duct, making it possible to muffle noise and exhaust air. This is what I did. The present invention will be described below with reference to FIGS. 2 and 3 showing embodiments.

The housing 1 includes a part that houses the printing part 2 and the control part 3 of the laser printer, and a part that houses the fixing part 4 and the stacker part 5.
a cleaner blower 6 for suctioning the toner remaining on the photosensitive drum after being transferred to paper (not shown) from the photosensitive drum, and a suction blower 7 for adsorbing the paper onto the hot plate of the fixing section. It consists of a blower chamber 8 that houses the.
The cleaner blower 6 is mounted on a blower mounting table that forms a space between the cleaner blower 6 and the bottom of the blower chamber 8 .

The blower chamber 8 that houses the blowers 6 and 7 is a part that connects the printing section 2 side and the fixing section 4 side, so six sides are made of thick iron plates to maintain the rigidity of the housing 1. ing. One side of it is the blower room 8.
The cover 9 has a removable structure so that it can be assembled.
It is becoming. In other words, the cover 9 constitutes the outer wall of the printer.

A partition plate 1 is installed near one wall of the blower chamber 8 so as to form an exhaust duct between the wall and the wall of the housing.
0 is set. A rectangular hole 10a extending in the width direction is provided in the upper part of the partition plate 10. Further, the lower end of the partition plate 10 extends to the space under the blower mounting table on which the blower 6 is mounted, and the exhaust duct formed between the housing 1 and the partition plate 10 is connected to the space under the mounting table. I try to do that. A plurality of exhaust holes 9a are provided below the cover 9 at positions corresponding to the space below the blower mounting table.

Therefore, the exhaust gas discharged from the cleaner blower 6 and the suction blower 7 enters the exhaust duct through the rectangular hole 10a of the partition plate 10, as shown by the arrow 14, and enters the casing 1 within the exhaust duct. The air then travels through repeated reflections by the partition plate 10, expands and enters the space under the blower mounting table, and is then discharged out of the printer through the exhaust hole 9a of the cover 9. As a result, the exhaust duct constituted by one side of the casing 1 and the partition plate 10 functions as a silencer, so that the noise emitted outside the printer is reduced.

As described above, according to the present invention, the structure of the casing is used to isolate the blower chamber from the outside of the printer with a thick iron plate, and a partition plate is provided inside the blower chamber to form an exhaust duct to provide a noise reduction effect. As a result, it is possible to reduce the noise emitted from the wall surface of the blower chamber and the exhaust hole of the cover in an inexpensive manner. Furthermore, since the blower chamber is divided by the wall of the casing to prevent the blower exhaust from having an adverse effect on the power supply control section or the stacker section, it is possible to achieve effects such as miniaturization of the laser printer.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a conventional apparatus, FIG. 2 is a side view showing an embodiment of a laser printer according to the present invention, and FIG. 3 is a perspective view of the main part of FIG. In the figure, 1 is a housing, 2 is a printing section, 3 is a control section, 4 is a fixing section, 5 is a stacker section, 6 is a cleaner blower, 7 is a suction blower, 8 is a blower chamber,
9 is a cover, 9a is an exhaust hole, 10 is a partition plate, 10
a is a hole, 11 is a muffler, and 13 is a support.

Claims (1)

[Scope of Claim for Utility Model Registration] A printing unit that transfers the toner image on the photoreceptor onto paper, a fixing unit that fixes the toner image transferred onto the paper, and a stack that deposits the paper with the toner image fixed on it. a control unit for controlling the operations of the printing unit, the fixing unit, the stack unit, etc.; a blower for suctioning the toner remaining on the photoconductor after transfer; and a blower for sucking the paper onto the fixing unit heating plate. a blower chamber located between the control section and the stack section, formed by a wall surface of the printer casing, and housing the at least two blowers; An exhaust duct is provided in the blower chamber so as to form an exhaust duct between a blower mounting table on which a blower is mounted and a space is formed between the blower chamber bottom plate and one wall surface of the housing, and the lower end is connected to the blower chamber. A sound insulation device for a laser printer, comprising: a partition plate extending to a space under the mounting table; and a number of exhaust holes connected to the space under the blower mounting table on a wall surface of a casing located outside the printer.