JPH0328873A - Fixing unit - Google Patents

Abstract

PURPOSE:To prevent the rear surface of a sheet from being soiled by permitting a rotation body cleaner and a felt to abut on the surface of a heat roller. CONSTITUTION:The fixing unit is constituted by permitting the rotation body cleaner 7 to abut on the surface of the heat roller 1 near the felt 8. After a sheet 5 holding a toner image passes between the heat roller 1 and the pressure roller 2, and the toner image is fixed, the sheet 5 is separated from the heat roller 1 by means of a sheet separating member 6. Thereafter toner and soil remaining on the surface of the heat roller 1 are thoroughly cleaned out by the rotation body cleaner 7 and the felt 8. thus, both the front and rear surfaces of the sheet 5 is prevented from being soiled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fixing unit, and particularly to a fixing unit that cleans the surface of a heating roller. [Prior Art] Conventionally, such a fixing unit has been used as a fixing means. A heated roller is used. Furthermore, since the surface of this heating roller is stained with toner and the like, a felt for cleaning this is provided so as to come into contact with the roller surface.

FIG. 2 is a perspective view of a fixing unit showing an example of such a conventional fixing unit. As shown in FIG. 2, the conventional fixing unit includes a heating roller 1 and a pressure roller 2 for fixing the toner image formed on a sheet 5, and a heat source lamp 4 provided inside the heating roller 1. , a pressure spring 3 that is attached to both ends of the shaft of the pressure roller 2 and applies pressure in the direction of the arrow; a plurality of sheet separation members 6 that separate the fixed sheets 5 from the heating roller 1; and a surface of the heating roller 1. It has a felt 8 for cleaning dirt adhering to the surface.

[Problem to be solved by the invention]

The conventional fixing unit described above has a problem in that the felt cannot completely remove the dirt on the surface of the heating roller. That is, if dirt such as toner remains on the heating roller, the toner or the like will be transferred from the heating roller to the pressure roller when there is no sheet. Therefore, when the felt cannot remove stains such as toner, etc., there is a disadvantage that not only the surface of the sheet becomes dirty, but also the pressure roller easily stains the back surface of the sheet.

An object of the present invention is to provide a fixing unit that completely removes stains caused by toner and the like on the surface of the heating roller and does not stain the front and back surfaces of the sheet. [Means for Solving the Problems] The fixing unit of the present invention includes a fixing unit in which a felt for cleaning is brought into contact with the surface of the heating roller, and a rotating body cleaner is brought into contact with the surface of the heating roller near the felt. It consists of [Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a fixing unit showing an embodiment of the present invention. As shown in FIG. 1, this embodiment includes a heating roller 1 made of a material such as aluminum, a pressure roller 2 made of an elastic material such as rubber, and a pressure roller 2 made of an elastic material such as rubber. A pressure spring 3 disposed between the shafts for applying the pressure necessary to fix the toner image, a heat source lamp 4 for applying heat to the heating roller 1, and a sheet 5 separated from the heating roller l. sheet separating member 6 and heating roller 1 for
A rotary body cleaner 7 and a felt 8 are used for cleaning the surface of the rotor. In particular, the rotating body cleaner 7 is provided near the felt 8 to enhance the absorption of dirt such as toner. In this fixing unit, after the sheet 5 holding the toner image passes between the heating roller 1 and the pressure roller 2 and the toner image is fixed, the sheet 5 holding the toner image is removed from the heating roller 1 by the sheet separating member 6. The separation of step 5 is performed. Thereafter, the toner and dirt remaining on the surface of the heating roller 1 are completely cleaned by the rotating body cleaner 7 and the felt 8. This prevents the front and back surfaces of the sheet 5 from getting dirty. [Effects of the Invention] As explained above, the fixing unit of the present invention removes dirt on the surface of the heating roller by bringing the rotary cleaner and felt into contact with the surface of the heating roller, and cleans not only the surface of the sheet but also the back surface of the sheet. It also has the effect of preventing dirt from getting dirty.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a fixing unit showing an embodiment of the present invention, and FIG. 2 is a perspective view of a fixing unit showing a conventional example.

Claims (1)

[Claims] What is claimed is: 1. A fixing unit in which a felt for cleaning is brought into contact with the surface of a heating roller, characterized in that a rotating body cleaner is brought into contact with the surface of the heating roller in the vicinity of the felt.