JPH028304Y2 - - Google Patents

Description

[Detailed Description of the Invention] (A) Technical Field of the Invention The present invention relates to electrophotographic printing devices, electrostatic recording printing devices, etc., and particularly relates to printing devices equipped with a pressure fixing device.

(B) Prior Art and Problems FIGS. 1, 2, and 3 are diagrams for explaining a pressure fixing device in a conventional printing apparatus. FIG. 1 is a cross-sectional view. In the figure, 1 is a fixed roller, 2 and 3 are movable rollers, 4 is a spring for pressing the paper, 5 is paper, and 8, which is indicated by diagonal lines, is a metal plate of the main body of the printing apparatus to which the pressure fixing device is attached. In the figure, when paper 5 is conveyed, movable rollers 2 and 3 are moved downward by springs 4.
Then, the movable rollers 2 and 3 press the paper 5 using the spring 4 to fix the visible image. FIG. 2 is a front view of a conventional pressure fixing device, and FIG. 3 is a top view.

In this figure, the same parts as in FIG. 1 are indicated by the same numbers. As shown in FIG. 2, in conventional printing apparatuses, a pressure fixing device is attached directly to a metal plate 8 with a screw 7. In such a pressure fixing device, noise is generated every time the paper 5 is conveyed and the movable rollers 2 and 3 are lowered or raised. Especially when printing one page at a time, the movable roller 2,
3, the number of operations increases and the noise becomes very loud.

In order to prevent this noise, it may be possible to install a vibration-proof rubber between the pressure fixing device and the sheet metal, but due to the elastic deformation of the vibration-proof rubber, paper transport as shown in Figures 1 and 3 may be difficult. The desired accuracy cannot be obtained for h.α to keep the direction constant.

(C) Purpose of the invention In view of the above-mentioned conventional drawbacks, the purpose of the present invention is to provide a printing device that can prevent the noise generated by the pressure fixing device without reducing the accuracy of paper conveyance.

(D) Structure of the invention The purpose of the invention is to provide a printing apparatus equipped with a pressure fixing device that fixes the toner image on the recording medium by means of rollers that nip and convey the recording medium carrying the toner image. This is accomplished by providing a printing device characterized in that the pressure fixing device is attached to the printing device via a damping steel plate.

(E) Embodiment of the invention Hereinafter, an embodiment of the invention will be described in detail with reference to the drawings.

In the present invention, the pressure fixing device is not directly attached to the main body of the printing apparatus, but a damping steel plate is provided between them.

FIG. 4 is a front view of the pressure fixing device in this embodiment. In this figure, the same parts as in FIG. 2 are represented by the same numbers. In the drawings, a blackened portion 9 is a vibration damping steel plate, 10 is a screw for fixing the vibration damping steel plate and the metal plate 8 of the printer main body, and 11 is a screw for fixing the vibration damping steel plate and the pressure fixing device. Here, the damping steel plate is well-known as a material with vibration-proof rubber sandwiched between metal plates.
In this vibration damping steel plate, elastic deformation due to the vibration isolating rubber can be ignored. In this embodiment, as shown in FIG. 4, the damping steel plate 9 is bent into an L-shape, and a pressure fixing device and a printing device are attached. In this way, vibrations caused by the vertical movement of the movable roller are absorbed. Furthermore, by bending it into an L shape, the distance between the pressure fixing device and the sheet metal 8 can be adjusted regardless of the thickness of the damping steel plate 9.

As another embodiment, as shown in FIG.
A damping steel plate 9' is placed on the damping steel plate 9', the sheet metal 8 and the damping steel plate 9' are fixed with screws 10', and a pressure fixing device is placed on the vibration damping steel plate 9' and fixed with screws 11'. Although similar effects can be obtained in this embodiment, the position of the pressure fixing device cannot be freely adjusted.

(F) Effects of the invention As explained in detail above, according to the invention, the damping steel plate absorbs the vibrations caused by the vertical movement of the movable roller, making it possible to prevent noise.
Since the vibration-damping steel plate can ignore its elastic change, it is also possible to maintain the accuracy of paper conveyance.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventional pressure fixing device;
The figure is a front view, FIG. 3 is a top view, and FIGS. 4 and 5 are views for explaining an embodiment of the present invention. In the drawing, 1 is a fixed roller, 2 and 3 are movable rollers, 4 is a spring, 5 is paper, 6, 7, 10, 1
0', 11, 11' are screws, 8 is a sheet metal of the main body of the printing device, and 9, 9' are vibration damping steel plates.

Claims (1)

[Claims for Utility Model Registration] A printing device comprising a pressure fixing device that fixes the toner image on the recording medium by means of rollers that sandwich and convey a recording medium carrying the toner image, the pressure fixing device is attached to the printing device via a vibration-damping steel plate.