JPS604467B2 - Fixing roller device for electronic copying machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fixing roller device for an electronic copying machine, which includes a pick-off blade for peeling off paper after fixing.

Copying machines that generally use a fixing roller are often provided with a pick-off blade, but this blade usually has a clearance between it and the surface of the fixing roller so as not to damage the surface.

If this clearance is set too large, the paper is likely to jam or fold, and if the clearance is set too small, the surface of the fixing roller may be damaged in the event of vibration or eccentricity of the fixing roller. Recently, it has been proposed to bring the blade into light pressure contact with the fusing roller within the image area, but this method scrapes off the anti-offset liquid, such as silicone oil, applied to the fusing roller. However, there are drawbacks such as silicone oil stains on the leading edge of the paper. In order to eliminate this drawback, it has been proposed to provide grooves, but this inevitably complicates the structure.
The present invention aims to eliminate the above-mentioned drawbacks in conventional fuser roller devices.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
In FIG. 1, a fixing roller 1 and a pressure roller 2 are mounted so as to be in pressure contact with each other and rotate in the direction of the arrow. A heater 3 is installed inside the fixing roller 1, and an anti-offset material such as silicone rubber or Teflon is attached to the surface of the fixing roller. A paper 5 carrying an unfixed powder image 4 is sent between a fixing roller 1 and a pressure roller 2 in the direction of arrow A, in which case the powder image 4 on the paper 5 is melted and fixed by the fixing roller 1, The paper is then discharged along the paper guide plate 6 9E. Suspension plate 8 pivotally connected to the blade support shaft 7
The pick-off blade 9 is attached to the pick-off blade 9 by screws 1, and abutting materials 11, 11 are fixed to both ends of the pick-off blade 9 by rivets 15, as shown in FIG.

The plaid unit consisting of the suspension plate 8, the blade 9 and the abutment material 11 is freely suspended on the plaid support shaft 7,
In that case, the center of gravity of this plaid unit is located on the opposite side of the fixing roller 1 with respect to the vertical plane including the plaid support shaft 7,
As a result, the abutment members 11, 11 are in contact with the surface of the fixing roller due to the moment action around the support 7 caused by the weight of the plaid unit. Of course, it is also possible for the fredon unit to contact the surface of the fixing roller not by its own weight, but by the action of a spring, for example. In this case, the center of gravity of the plaid knit may be located at any position. In FIG. 2, the fixing roller 1 is attached to the side plate 12 of the copying machine.
via a bearing 13 and a bearing support 14 so as to be rotatable.

The pick-off blade 9 is placed on the butt material 1 as described above.
1 and 11, a clearance C of about 0.1 to 0.5 fence is created between the fixing roller and the blade 9. The fuser roller has an active image castle of width 1 in its center and a non-image castle outside this active image area. The abutment material 11 is in contact with the fixing roller at this non-image position, and the fixing roller 1
The clearance C between the plate 9 and the plate 9 extends over the entire width 1 of said effective image castle and slightly beyond its ends. In the embodiment shown in FIG. 3, an abutting roller 16 is used in place of the abutting member 11 in the embodiments of FIGS. 1 and 2.

In this case, clearance fluctuations may occur due to deflection of the rollers 16, but the blade does not come into contact with the fixing roller 1, and the negative effects of friction between the rollers 16 and the fixing roller are significantly reduced. be done. With the above-described configuration, the fixing roller device of the present invention reliably guarantees a predetermined clearance between the pickoff blade and the fixing roller, so that the blade can clean the paper without scraping off the silicone oil on the surface of the fixing roller. It can be pulled away from the fixing roller and then discharged out of the machine.

Particularly in the embodiments shown in FIGS. 1 and 2, if the abutment member is harder than the material on the surface of the fixing roller, such as Teflon, the surface material will peel off during long-term use. The material of the fixing roller is preferably softer than the surface material of the fixing roller, or at least as soft as the surface material of the fixing roller. As such a material, Teflon resin or Rulon is most suitable.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a fixing roller device according to the present invention, FIG. 2 is a plan view showing a part of the fixing roller device in cross section, and FIG. 3 is a side view of a fixing roller device according to the present invention. FIG.

1... Fixing roller, 2... Pressure roller, 9
...Pick-off blade, 11...Abutting material, 16...Abutting roller, C...Clearance.

Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. In a fixing roller device for an electronic copying machine equipped with a pick-off blade for peeling off paper after fixing, an abutting member that contacts the fixing roller outside the effective image area of the fixing roller is A fixing roller device, characterized in that the abutting members are attached to both ends of the pick-off blade and come into contact with the fixing roller, thereby forming a predetermined clearance between the fixing roller and the pick-off blade. 2. The fixing roller device according to claim 1, wherein the abutting member is made of a material whose hardness is lower than or at least equal to the material of the surface of the fixing roller with which it comes into contact. 3. The fixing roller device according to claim 1, wherein the abutting member comprises a roller rotatably attached to the blade.