JPH0442859Y2 - - 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. This flash fixing device consists of a flash lamp and a lamp for protecting a reflector disposed behind it, and a light irradiation opening covered with transparent glass is formed in the front of this lamp. This transparent glass is fixed with a holding member attached to the lamp.

However, the photographic paper is often wound in a roll, and the leading edge of the photographic paper supplied from this roll may be curled, causing the photographic paper to get stuck to the holding member that holds the transparent glass. Occasionally, it would cause a jam.

[Purpose of invention]

Therefore, the present invention provides a flash fixing device that is suitable for high-speed printers such as laser beam printers, which does not cause paper jams due to the leading edge of the rolled photographic paper getting caught even when it is continuously fixed at high speed. The purpose is to

[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 that surrounds the flash lamp and the reflector and covers the aperture for light irradiation on the front side. and a guide member consisting of an inclined part extending toward the transparent glass at one end on the front side on the downstream side with respect to the flow of the photographic paper. It has a stepped portion cut along the longitudinal direction of the flash lamp on the downstream side with respect to the flow of paper, and the upper end of the inclined portion of the guide member is positioned in this stepped portion without any gap. shall be.

[Effect]

According to this configuration, a stepped portion cut along the longitudinal direction of the flash lamp is provided on the front side of the transparent glass that covers the light irradiation opening on the front surface of the lamp, on the downstream side with respect to the flow of the photographic paper. A guide member having an inclined portion extending from the downstream side toward the stepped portion with respect to the flow of the photographic paper is disposed, and the upper end of this inclined portion is positioned without a gap with the stepped portion of the transparent glass. Since it has a structure that holds a piece of transparent glass, even if the paper has a curled tip, it will be carried along the slope, so there will be no chance of paper jams.

〔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, a flash lamp 2 with a length of 552 mm, an inner diameter of 10.5 mm, an arc length of 490 mm, and an input energy of 400 joules is installed. 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 on which toner to be fixed is transferred faces the opening 4 and moves in the direction of the arrow x. 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 almost parallel to the flash lamp 2, and the circumference is surrounded by a plate-like member 6. The space 7 thus formed is in communication with an exhaust fan (not shown). 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 is in the form of a slit or a row of round holes, in consideration of resistance to flow, it is preferable to make the slits narrower if they are successive toward the exhaust fan, and smaller if they are round holes.
This first suction hole 5 is covered with a guide member 9 having an inclined part 8 extending toward the transparent glass, and a second suction hole 10 is bored in the inclined part 8 of this guide member 9. The enclosed space 13 surrounds everything except the communication path to the exhaust fan so that the flow of air can be exhausted from the second suction hole 10 and through the first suction hole 5. And the inclined part 8 of the guide member 9
serves to hold one side of the transparent glass 12. In FIG. 2, the transparent glass 12 is connected to the guide member 9.
FIG. 2 is an enlarged view of a portion held by an inclined portion 8 of the FIG. The upper end 11 of the inclined portion 8 is located on the stepped portion 14 of the transparent glass 12 without any gap. Stepped portion 14
is formed by cutting the transparent glass 12 by approximately 0.5 mm, indicating that the upper end 11 of the inclined portion 8 is recessed by approximately 0.5 mm. That is, transparent glass 1
2 is approximately 1.8 mm, the thickness a of the stepped portion 14 is approximately 1.3 mm, which is sufficient to hold the transparent glass 12. The shape of the second suction hole 10 may be a slit like the first suction hole 5, or it may be formed with a large number of small holes.

However, when the sheet of paper with a curled tip moves in the direction of arrow The leading edge of the photographic paper is guided smoothly along the inclined portion 8 without causing a paper jam due to the paper being caught in a small gap.

[Effect of idea]

As can be understood from the description of the embodiments above, the flash fixing device of the present invention has a step-shaped part on the front side of the transparent glass that covers the light irradiation opening of the lamp, in the longitudinal direction on the downstream side with respect to the flow of the photographic paper. , and a guide member having an inclined part extending toward the stepped part from the downstream side with respect to the flow of the photographic paper is arranged, so that the upper end of the inclined part is embedded in the stepped part provided in the transparent glass. I'm here. Therefore, the slanted part not only holds one side of the transparent glass, but also prevents the tip from getting jammed when replacing the paper supplied from the roll, and always irradiates a large amount of light onto the paper. This makes it possible to fix the toner in 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. FIG. 2 is an enlarged view of the portion where the transparent glass is held by the inclined portion of the guide member. 1...Lamp, 2...Flash lamp, 3...
Reflector, 4... Opening, 5... First suction hole, 6...
Plate member, 7... Blank space, 8... Inclined portion, 9... Guide member, 10... Second suction hole, 11... Upper end,
12... Transparent glass, 13... Blank space, 14... Stepped portion.

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. The guide member includes a lamp covered with glass and a guide member that is located in front of the downstream side with respect to the flow of the photographic paper and has one end extending toward the transparent glass. has a stepped portion cut along the longitudinal direction of the flash lamp on the downstream side with respect to the flow of the photographic paper, and the upper end of the inclined portion of the guide member is located in this stepped portion. A flash fixing device featuring: