JPS60250575A - Rotor power supply device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode device, and more particularly to an electrode device used in a sliding part of a photosensitive drum or the like of a copying machine, to which it is preferably applied.

As a conventional electrode device of this type, one constructed as shown in FIG. 1 has been proposed. In the figure, a drum shaft support 2 is fixed to a main body 1 of the copying apparatus, and the drum shaft support 2 supports a drum shaft 8 having a longitudinal cylindrical shape. A photosensitive drum 4 is rotatably mounted inside the drum 3 through a bearing 5. Note that a heater 6 is provided around the inner surface of the photoreceptor drum 4 to keep the surface warm. The drum shaft support 2 has a first electrode (hereinafter referred to as a current collection brush) for supplying power to the heater 6.
Further, on the end surface of the photosensitive drum 4, a second electrode (hereinafter referred to as a first electrode rail) 8 is laid in an annular shape with the drum shaft 8 as the center. In addition, 1! Each of the pole rails 8 is connected to a heater 6. Even when the photoreceptor drum 4 rotates, the current collector brush 7 is able to slide on the electrode rail 8, so the contact state is maintained, and therefore, external power is transferred to the current collector brush. and is supplied to the heater 6 via the electrode rail 8.

However, in the above-described apparatus, in order for the photosensitive drum 4 to be rotatable with respect to the drum shaft support 2, it is necessary to provide an appropriate gap 9 between them. Therefore, foreign matter such as toner scattered from a developing device (not shown) provided adjacent to the photoreceptor drum 4 enters into the gap 9 . Then, the infiltrated toner adheres to the contact portion between the current collecting brush 7 and the electrode rail 8, resulting in poor contact and a problem that a good conductive state cannot be maintained.

An object of the present invention is to solve the above problems and provide an electrode device that can maintain a good contact state.

In order to achieve the above object, a rotating body power supply device of the present invention includes a first electrode for supplying electric power, a rotating body rotatable with respect to the first electrode, and a rotating body that is rotatable with respect to the first electrode. a second electrode for receiving the electric power in contact with the electrode; By providing a flow path for guiding gas from the inside of the rotating body to the outside,
This is to prevent foreign matter such as toner from entering from the surrounding area.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a plan sectional view showing essential parts of an embodiment of the present invention, and FIG. 3 is a sectional view taken along line XX in FIG.

A drum shaft support 12 is fixed to the main body 11 of the copying apparatus. The drum shaft support 12 fixedly supports a tram shaft 13 having a longitudinal cylindrical shape. The drum shaft 13- has a cavity 13g inside, so that gas can freely enter from the outside through the opening 13b. A photosensitive drum 14 is mounted via a bearing 15 so as to be rotatable about a drum shaft 18 . On the inner surface of the photosensitive drum 14,
A heater 16 is installed to keep the surface temperature of the photoreceptor drum 14 constant. The drum shaft support 12 is equipped with a current collection brush 17 for supplying power to the heater 16. The current collecting brush 17 is movable in its longitudinal direction while being biased by a spring 17a. At the end of the photosensitive drum 14, an annular electrode rail 18 is laid concentrically around the drum shaft 18. Photosensitive drum 14
During rotation, the current collector brush 17 supplies electric power to the heater 6 while slidingly contacting the electrode rail 18.

Further, in this embodiment, a cavity 19 is formed between the drum shaft support 12 and the end of the photosensitive drum 14.

Furthermore, a hole 13c is formed in the drum shaft 18 at a position exactly corresponding to the cavity 19 in its longitudinal direction. cavity 1
3a and the cavity 19 form a gas flow path via the hole 13c. Note that even if the cavity 19 is not particularly wide,
If a gas flow path is formed around the current collecting brush 17, the intended purpose of the present invention can be achieved. Since the photosensitive drum 14 is kept warm by the heater 16, the gas inside the cavity 19 has a higher temperature than the outside gas. Therefore, thermal convection occurs there, and the external gas (indicated by the arrow) that has flowed in from the opening 13b is discharged from the outlet 20 via the cavity 13a1, the hole 13c, and the cavity 19.

Furthermore, in this embodiment, a plurality of fins 21 are arranged radially at the end of the photosensitive drum 14, as is clear from FIG. Therefore, when the photoreceptor drum 14 starts rotating, the fins 21 also rotate in response to the rotation. Therefore, during this rotation, due to the rotation of the fins 21, stagnation occurs outward within the cavity 19 as described in 1. 4-1-2 above. It is able to exhaust gas more powerfully than the traditional method.

In the above embodiment, the fins 21 are provided in the cavity 19, but any fins may be used as long as they guide external gas from the opening 13b to the outlet 20. . For example, a fan may be provided outside to forcibly send gas through the opening 13b.

As explained above, the present invention prevents foreign matter such as toner from entering the interior through the gap by forcibly generating airflow through the contacts of the electrodes. It has the very excellent effect of being able to maintain the condition in good condition.

The present invention can be applied to a fixing roller, a photoreceptor, an image carrier that requires heating, or a rotating body that requires heating.

[Brief explanation of drawings]

Claims (1)

[Claims] A first electrode for supplying power, and a second electrode provided on a rotating body rotatable with respect to the first electrode and in contact with the first electrode to receive the power. A rotating body power supply device having a rotating body power supply device 0, characterized in that a gas flow path is provided through the first electrode and the second electrode.