JPS6120075A - Flash fixing device - Google Patents

Abstract

PURPOSE:To prevent a recording medium from having adverse influence such as light fatigue and an operator from being suffered from flash trouble by arranging a heat roll device which heats recording paper preliminarily at a recording paper entry part which is positioned right before a flash fixing part and receives the recording paper at the flash fixing part. CONSTITUTION:The flash fixing device consists of the flash fixing part 3 and recording paper entry part 4, and the recording paper 1 to which a toner image is transferred from a photosensitive drum 9 is conveyed to the recording paper entry part 4. The recording paper entry part 4 is provided with the heat roll device 5 and the recording paper 1 heated preliminarily by the heat roll device 5 is sent to the flash fixing part 3 through the rotation of rolls 11 and 12. The heat roll part 5 which is relatively high is arranged close to a gap 7 and shields the gap 7 and the heat roll 11 contacts the recording paper 1, so leak light traveling to the photosensitive drum 9 is cut off completely by the heat roll device 5. Further, the quantity of leak light to the whole periphery is reduced and the operator's eye is neither stimulated nor troubled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image recording apparatus such as a facsimile machine, a copying machine, a printer, etc., which fixes a toner image on recording paper, and particularly relates to a fixing device thereof.

Conventional technology For example, in an electrophotographic copying machine, an electrostatic latent image is formed on a photoreceptor by exposing an optical image of the original damage onto the photoreceptor, and this electrostatic latent W! is developed with fine particles called toner, one toner image is transferred onto the recording paper, and then the toner image is fixed onto the recording paper 1. Conventionally, for such fixing, heat rolls, infrared lamps, etc. The most commonly used method is to fuse the toner onto the recording paper by heating it with a heating means.

However, in such conventional fixing methods, the toner and the recording paper are heated in almost the same temperature environment, so if the control is incorrect, there is a risk that the recording paper will burn or burn. . At this time, it has been proposed that a flash fixation method is used to record the flash energy of the flash lamp and to record the flash energy. It is instantaneously absorbed into the toner of I-, raising the temperature of the toner itself to above its melting point, and causing it to cool on the recording paper. The temperature increase due to the reflection is very small compared to conventional heating methods, and there is no danger of the VC recording paper burning as described in Section 2.

However, on the other hand, even if the toner absorbs enough energy and melts in the bath, the temperature of the recording paper itself will hardly rise. or evil (
However, if the amount of flash radiation is increased too much in order to improve the fixing performance, the toner will scatter, resulting in a decrease in -IW of the same image, resulting in an increase in the power consumption.

Therefore, the recording paper is supplementally heated in advance to near the melting point of the toner prior to the 7-cycle irradiation.As an auxiliary heating method, the recording paper is heated from the back side with a heating plate (specially Kai I (i 54-70052),
41 - Non-contact heating method using wave heating
-133075) etc. (Figure 3 is])
1 shows a conventionally proposed flash fixing device that adopts the method of heating with a heating plate, 01 is a flash lamp, 02
is a reflective member that covers the back of the flash lamp OI.

The recording paper 07 is conveyed in the right direction of the arrow, and is covered with the reflective member 02, so that one part of the recording paper 07 is affected by the flash of light from the flash lamp 01.
is preheated from behind by a heating plate 03. 04 is a heater that heats the heating plate 03. ◎ In such a conventional flash fixing device, as shown in Fig. This flash of light is so strong that it instantly melts the toner, either from the gap between the reflective member and the recording paper, or by the direction of the attached particles. If the photoreceptor or similar recording medium for forming an electrostatic latent image is irradiated with the leaked light, it may cause fatigue or other adverse effects on the photoreceptor.

There is also a risk of light leakage or flash damage to the operators.

Therefore, the present invention aims to improve the shortcomings of the conventional flash fixation device, such as those described in h, and to reduce the light leakage during flashing of the flash lamp.Furthermore, at the same time, it is an object of the present invention to effectively utilize recording paper assistance and JII heat. This is an attempt to obtain the result 19j of light leakage.

In view of this, the flash fixing device of the present invention is implemented in a flash fixing device that fixes an unfixed toner image on a recording paper 1 by the flash energy of a flash lamp 2, as shown in FIG. 4) The recording paper 1 is placed directly in front of the flash fixing section 3, and the recording paper 1 is fed into the flash fixing section 3. It is characterized in that a heat roll device 5 is disposed for supplementary heating.

In the flash fixing device of the present invention, the recording paper l having an unfixed toner image entering the device is first passed through the blank roll device 5VC to a temperature at which the unfixed toner image becomes semi-fused. The toner is auxiliary heated or preheated, and then sent to the flash fixing section 3 where it is completely fixed by flash light.

Since the silent roll device 5 transfers heat by pressing the heating roll against the recording paper 1, the recording paper 1
It is possible to achieve a much more uniform and constant 1 m degree efficiently.Also, the heat roll device 5, due to the association between the rotating roll and the recording paper, transfers the recording paper to the flash fixing section 3.
Since it functions as a feed roller to feed the material, it improves the conveyance performance of the original.

The heat roll device M5 is in contact with the coating surface of the recording paper 10, protrudes from the surface in the negative direction, and is disposed close to the fludge fixing section 3, so that the recording paper 1 and the reflective member Light leakage 8 through the gap 7 between the heat roll device 5 and the heat roll device 5 is traced to the heat roll device 5. Therefore, this leakage light irradiates a recording medium such as a photoreceptor installed on the second-stream side of the recording paper conveyance path, causing optical fatigue of the medium, and leaks widely into the surrounding area, causing flash damage to operators and others. There's nothing to worry about.

Example Examples of the present invention will be described below.

FIG. 1 shows an example in which the present invention is applied to a flash fixing device of an electrophotographic copying machine. This flash fixing device consists of a flash fixing section 3 and a recording paper entry section 4 as described in r+'+1, and a toner image is transferred from a photosensitive drum 9 and recorded on a recording paper 1 by a conveyor belt 10. The paper is transported to the paper entry section 4.

A thermal roll device 5 is provided in the recording paper entry section 4.
This heating roll device 5 contacts the first side of the recording paper 1, that is, the surface on which an undetermined amount of toner is attached, and transfers heat thereto, and the heating roll 11 contacts the back side of the recording paper 1 and records paper 1
? : It consists of a pressure roll 12 brought into pressure contact with the heating roll 11. The surface of the heating port 11 is heated to a uniform temperature by an appropriate heating means, or the heating of the recording paper 1 by the heating roll device 5 is auxiliary heating. It may be of a degree of crushing that can bring the toner into a semi-melting state and prevent the toner from coming off onto the heating roll 11.

The recording paper 1 auxiliary heated by the heat roll device 5 in this manner is sent to the flash gM section 3 by the simultaneous rotation of the rolls II and 12, and is conveyed by the conveyor belt 13 and passes through the flash fixing section 3. At this time, the toner image is successively irradiated with flashing light from the Franche lamp 2, and the toner image in the semi-containing state is bath-melted by the light (♀) and fixed on the recording paper.

The upper part and all four circumferences of the flash lamp 2 are covered with a reflective member 6, which effectively directs the flash light of the Franche lamp 2 toward the recording paper 10 and 1), and also prevents this flash light from leaking to the surroundings and causing trouble. I try not to. However, between this reflective member 6 and the recording paper 1, there is a gap between the entrance and exit of the recording paper 1.
Since there is a gap 7 between the recording paper 1 and the recording paper 1, a flash of light from the flash lamp 1 is reflected by the recording paper 1 and leaks through the gap 7. Since the photoreceptor drum 9 is relatively close to the recording paper entrance part 4 side and is located at a distance of 1 fl, the light leakage 8 from the entrance part 4 reaches the photoreceptor drum 9 along the recording paper, and the photosensitive drum 9 is exposed. It has negative effects on the body such as light fatigue.

However, in this embodiment, as shown in the figure, the heating roll device 5 is relatively tall and is disposed close to the heating roll device 5 to cover the gap. 1
1 comes into contact with the recording paper 1 (B), so the leakage of light toward the photosensitive drum 9 is caused by the heat roll device Wt 5 VC.
g be cut off. Due to the shielding effect of the gap 7 by the heating roll device 5, the light leakage of the entire INN is also reduced, and the operator's eyes will not be irritated or injured.

FIG. 2 shows another embodiment. In this embodiment, the entire flash fixing device including the flanged constant increase section 3 and the recording paper entry section 4 is further covered with a light shielding plate 14. According to this example, since the trace light plate 14 passes between the heat roll device 5 and the reflective member 6 and goes to one side, it is blocked by red, so that almost complete leakage tracing is achieved. You can get some effect.

Effects of the Invention - As described in second part, in the present invention, in the flash constant monitoring device that fixes the unfixed toner image on the recording paper by the flash energy of the Franche lamp, the recording paper enters the recording paper entry section immediately before the flash fixing section. A heat roll device is arranged to auxiliary heat the paper.1 The heat roll device performs temporary adhesion of the toner image and uniform preheating of the recording paper, thus obtaining a good fludge constant adhesion, and the heat roll The system is designed to shield light leakage from the N section of the device, and to prevent damage caused to recording media such as photoreceptors due to light fatigue due to the irradiation of leaked light, and to prevent damage to operators due to flash damage. It can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the present invention, FIG. 2 is a front view showing another embodiment, and FIG. 3 is a front view showing a conventional flash fixing device. ]... Recording paper, 2... Flash lamp, 3... Flash fixing section, 4... Recording paper entry section, 5... Silent roll device, 6... Reflective hIS material, 7... Gap, 8...Light leakage, 9...Photoconductor) 7 ram, 1o...Conveyor bell l-
, I+... Heating rr-roll, 12... Pressure roll, 1
3... Conveyor Pel t-1Ia... Light shielding plate.

Claims (1)

[Claims] A flash fixing device that fixes an unfixed toner image on a recording paper by flash energy of a flash lamp, characterized in that a heat roll device that auxiliary heats the recording paper is disposed at the recording paper entrance section immediately before the flash fixing section. flash fixing device.