JPH0442858Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flash fixing device suitable for high-speed printers such as laser beam printers.

[Prior art and its problems]

Non-impact type laser beam printers have the advantage of being able to print out at high speed, but the fixing device used in these laser beam printers needs to continuously fix the toner at high speed, so the toner image is The formed photographic paper is instantaneously irradiated with a large amount of light using a flash lamp to fix the toner. In this flash lamp fixing device, a light irradiation opening is formed in the front surface of a lamp surrounding the flash lamp, and this opening approaches and faces the moving photographic paper. In order to protect the flash lamp and the reflector behind it, the opening of the lamp is covered with transparent glass, and this transparent glass is fixed by a holding member attached to the lamp.

By the way, this instantaneous fixing generates smoke that contains finer particles than the toner, but if the toner is continuously fixed at high speed, the amount of smoke generated becomes considerably large.
Fine particles adhere to the transparent glass that covers the opening of the lamp. Therefore, since the transmission of light is obstructed and the amount of light is reduced, there is a problem in that the transparent glass often needs to be cleaned.

Furthermore, the paper is often wound in a roll, and the leading edge of the paper fed from this roll may curl, causing paper jams when it gets caught on the holding member that holds the transparent glass. It was hot.

[Purpose of invention]

Therefore, with this invention, even if the toner is continuously fixed at high speed, the fine particles contained in the smoke generated by the toner do not adhere to the transparent glass that covers the opening of the lamp, and the toner is fixed instantly by constantly irradiating a large amount of light. It is an object of the present invention to provide a flash lamp fixing device which is suitable for high-speed printers such as laser beam printers, and which is suitable for high-speed printers such as laser beam printers, and which can prevent paper jams from occurring due to the leading edge of photographic paper getting stuck.

[Structure of the idea]

The structure of the present invention includes a flash lamp, a reflector that reflects light from the flash lamp to an aperture for light irradiation, and a transparent glass plate surrounding the flash lamp and the reflector and the aperture for light irradiation on the front side. In the flash fixing device having a covered lamp, the lamp covers its front surface on the downstream side with respect to the flow of the photographic paper with a gutter-like member having an inclined part extending toward the transparent glass, and the gutter-like member The transparent glass is characterized in that a suction hole is formed in the sloped part of the transparent glass, and one side of the transparent glass is held by the sloped part.

[Effect]

According to this configuration, the gutter-like member provided to cover the downstream side of the flow of photographic paper in front of the lamp has an inclined portion extending toward the transparent glass on the upstream side with respect to the flow of photographic paper. However, since one side of the transparent glass is held by this sloped part and a suction hole is provided in the sloped part, the smoke containing fine particles generated from the toner due to instantaneous fixing is efficiently absorbed into this suction hole. , will not adhere to transparent glass. Furthermore, even if the leading edge of the paper is curled, the paper is conveyed along the slope, so paper jams will never occur.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an explanatory diagram of a flash fixing device according to an embodiment. Inside a substantially rectangular parallelepiped-shaped lamp 1, there is a flash lamp 2 having a length of 552 mm, an inner diameter of 13 mm, an arc length of 460 mm, and an input energy of 400 joules. Further, a reflecting plate 3 is arranged behind it. A light irradiation opening 4 is provided in the front surface of the lamp 1, and a sheet of paper to which toner to be fixed is transferred is moved to face the opening 4. The arrow x indicates the running level and direction of the photographic paper. A slit-shaped first suction hole 5 is bored in the front surface of the lamp 1 located on the downstream side with respect to the flow of the photographic paper in parallel with the flash lamp 2, and a plate-like member 6 surrounds the slit-shaped first suction hole 5. The space 7 thus formed is communicated with the exhaust fan 13 and the like. The length of the first suction hole 5 is 450 mm, but it may be one in which round holes or the like are bored in a row.
Whether it's a slit or a row of round holes,
Considering the resistance to flow, it is preferable to make the slits narrower if they are successive slits toward the exhaust fan 13, and smaller if they are round holes. This first suction hole 5 is covered with a gutter-like member 9 having an inclined part 8 extending toward the transparent glass on the upstream side with respect to the flow of the photographic paper. Two suction holes 10 are bored, and the spaces 7 and 14 surround the area other than the communication path to the exhaust fan 13 so that the flow of air can be exhausted from the second suction hole 10 through the first suction hole 5. . The sloped part 8 of the gutter-like member 9 is made of transparent glass 1.
2, the upper end 11 is held in contact with the transparent glass 12 covering the opening 4 without any gap. The shape of the second suction hole 10 may be a slit like the first suction hole 5, or may have a large number of small holes. The flash lamp 2, which flashes at high speed, irradiates light containing infrared rays to fix the toner, but since the toner is continuously fixed at high speed, a larger amount of smoke is generated than the toner. However, since there is a slight time lag between the time when light is irradiated and the time when smoke is generated, by the time smoke is generated, the toner has moved directly under or near the second suction hole 10, and the generated smoke is transferred to the second suction hole 10. Suction is efficiently carried out by the suction hole 10. Therefore,
Fine particles contained in the smoke are also efficiently sucked in by the second suction holes 10, hardly any of them adhere to the transparent glass 12, and the transparent glass 12 does not become cloudy even if they are continuously fixed at high speed. Therefore, the effort of cleaning the transparent glass 12 can be saved, and a large amount of light can always be irradiated onto the photographic paper for fixation.

Moreover, since the second suction hole 10 is provided in the inclined part 8 of the gutter-like member 9, it is possible to efficiently suck in fine particles floating just below the transparent glass 12.

Further, this gutter-like member 9 serves to hold one side of the transparent glass 12 at the inclined portion 8. Therefore, there is no chance of paper jams occurring when replacing the paper supplied from the roll.

[Effect of idea]

As can be understood from the description of the embodiments above, the flash fixing device of the present invention is provided with a gutter-like member in front of the lamp so as to cover the downstream side of the flow of the photographic paper. Since the second suction hole is provided on the sloped part, which is the position where the smoke generated from the toner can be sucked in most efficiently, most of the fine particles contained in the smoke generated from the toner do not adhere to the transparent glass, and the transparent glass is cleaned. This saves time and effort, and because the structure holds the transparent glass on the slope of the gutter-like member, paper jams do not occur, and it is possible to constantly irradiate a large amount of light onto the paper to fix the toner. , it can be a flash fixing device suitable for high speed printers such as laser beam printers.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the present invention, and is shown in a cross section perpendicular to the longitudinal direction of a rod-shaped flash lamp. 1...Lamp, 2...Flash lamp, 3...
Reflector, 4... Opening, 5... First suction hole, 6...
Plate-shaped member, 7... Blank space, 8... Inclined portion, 9... Gutter-like member, 10... Second suction hole, 11... Upper end, 1
2...Transparent glass, 13...Exhaust fan, 14...
...empty space.

Claims (1)

[Scope of Claim for Utility Model Registration] A flash lamp, a reflector that reflects light from the flash lamp to an aperture for light irradiation, and a transparent aperture for light irradiation on the front side that surrounds these flash lamps and the reflector. In a flash fixing device having a lamp covered with glass, the lamp has a front surface on the downstream side with respect to the flow of the photographic paper covered with a gutter-like member having an inclined part extending toward the transparent glass; A flash fixing device characterized in that a suction hole is formed in an inclined part of the member and one side of the transparent glass is held by the inclined part.