JPH0720685Y2 - Power supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a power supply device for supplying power to a heater incorporated in a photosensitive drum.

(B) Conventional Technology In an image forming apparatus that repeatedly uses a photoconductor drum, the photoconductor drum is held at a temperature slightly higher than room temperature.

This is effective in preventing the photoconductive material used in the image forming apparatus from being easily charged in the charging step at low temperature or high humidity, which causes deterioration of image quality.

Therefore, conventionally, a heater is provided in the support shaft of the photosensitive drum, and a heater is attached to the inner surface of the photosensitive drum,
There is one in which a photosensitive drum and an apparatus main body are electrically connected by a sliding member.

(C) Problems to be solved by the invention In the above-described conventional technology, there are many parts and the structure is complicated, and the sliding portion for supplying power to the heater is contaminated by toner powder, paper powder, etc. Easy to get up.

(D) Means for Solving the Problems The present invention is directed to a photosensitive drum having a built-in heater supported by the main body of an image forming apparatus, and an end face of the photosensitive drum, which is coaxially detachably mounted and slips. A relay member including a ring, and a power transmission unit slidingly contacting the slip ring,
In the power feeding device for feeding power from the power transmission unit to the heater of the photoconductor drum via the slip ring, in order to solve the above problems, the power transmission unit in sliding contact with the slip ring is covered. A flange provided on the relay member, an opening formed in the apparatus body to which the power transmission unit is attached and which is in sliding contact with the slip ring from the outer peripheral side of the image forming apparatus body, and the flange on the image forming apparatus body. A seal member provided to face the
The sliding contact of the power transmission unit with respect to the slip ring is performed in a dust-proof chamber defined by the flange and a seal member.

(E) Action As described above, the structure of the power transmission unit and the relay member is assembled to simplify the structure, and the power transmission unit can be easily removed through the opening. , And is arranged in a dustproof chamber defined by the seal member, and the sliding contact portion is protected from toner powder, paper powder, and the like.

(F) Embodiment FIG. 4 is a sectional view showing an electrostatic printer equipped with a power supply device according to the present invention.

In this figure, (1) is the main body of the electrostatic printer, and the photosensitive drum (2) is rotatably installed in the drum shaft (55) at the approximate center thereof. An optical system including a monolithic light emitting diode array (hereinafter referred to as an LED array) (3) and a short focus lens array (4), a charging corotron (5), and a discharging lamp (6) are provided on the top of the photosensitive drum (2). ) Is fixed to one chassis, and an optical system unit (7) is provided. This optical system unit (7) is constructed so as to be able to rotate in a counterclockwise direction with a support shaft (8) provided at the left end as a fulcrum.

An electrostatic latent image formed on the peripheral side of the photoconductor drum (2) on the downstream side (right side in the figure) of the optical system unit (7) along the rotation direction of the photoconductor drum (2). A developing device (9) for developing toner with toner is attached. This developing device (9) comprises a toner hopper (10) and a developing chamber (11), an arm (12) for stirring toner is rotatably mounted in the toner hopper (10), and a developing chamber (11) has a magnetic A net roller (13) and a stirring shaft (14) (15) are rotatably mounted inside. (16) is toner toner (1
It is a lid of (0), and (17) is a knob. A toner supply roller (18) is provided between the toner hopper (10) and the developing chamber (11) to supply the toner in the toner hopper (10) to the developing chamber (11) little by little. The developing device (9) is constructed so that it can be pulled out obliquely to the upper right. Reference numeral (19) is a connector for electrically connecting the developing device (9) and the printer body (1).

Below the developing device (9), there is provided a paper feeding device (22) in which a paper feeding cassette (21) in which recording papers (20) ... There is.
This paper feeding device (22) temporarily stops the paper feeding roller (23) for feeding the uppermost recording paper (20) and the recording paper (20) fed by the paper feeding roller (23). Register roller pair (24) that re-feeds after timing
(25) consists of and.

Further, at the bottom of the photoconductor drum (2), a transfer corotron (26) for transferring the toner image on the photoconductor drum (2) to the recording paper (20) and the recording paper from the photoconductor drum (2). A separating corotron (27) for separating (20) is provided.

To the left of the separation corotron (27) is provided a conveyor (28) that conveys the recording paper (20) on which the toner image has been transferred, and below the ozone filter (29) and exhaust fan (30). It is provided.

The components from the paper feeding device (22) to the conveyer conveyor (28) are mounted on the same chassis, and the conveyer unit (31) is attached.
Is formed so that the transport unit (31) can be pulled out rightward from the printer body (1).

To the left of the transport unit (31), the heat roller (3
The fixing unit (34) consisting of 2) and the pressure roller (33) pressed against this is constructed so as to be pulled out to the left. An oil application member (35) for applying silicon oil to the heat roller (32) and a blade (36) for peeling off the adhered toner are in sliding contact with the heat roller (32). (37) and (38) are a pair of discharge rollers.

Above the fixing unit (34), there is provided a filter unit (41) equipped with an ozone filter (39) for removing ozone generated by various corotrons and an exhaust fan (40). This Filter Unit (41)
A board unit (43) on which a control board (42) is mounted is provided on the upper part of the board unit (43).
Is configured so that it can rotate in a counterclockwise direction with the support shaft (44) at the left end as a fulcrum.

A cleaning unit (45) is provided on the left side of the photoconductor drum (2) to remove the toner remaining on the photoconductor drum (2) that has not been transferred to the recording paper (20).
The cleaning unit (45) is equipped with a cleaning blade (46) for slidingly contacting the photosensitive drum (2) to remove the toner, and a screen conveyer (47) for discharging the residual toner. The cleaning unit (45) is rotatably supported by the support shaft (48) on the upper left side thereof.

On the top surface of the printer body (1), there are two components (49).
A lid (51) divided into (50) is attached. The left end portion of one component portion (49) of the lid body (51) is fixed to the chassis (52) of the printer body (1) with a screw (53),
The other component (50) of the lid (51) is swingably mounted to the right end of the lid via a hinge (54).

FIG. 1 is an exploded perspective view of a main part of a paper feeding device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view thereof, and FIG. 3 is a partial cross-sectional view of the same in the longitudinal direction.

The power transmission section (66) includes a power transmission body (62), a terminal (60), and a power transmission contact piece (59), is positioned by the opening (84), and is screwed to the printer body (1) with a screw (75).

A seal member (61) and a drum insertion guide (68) are attached to the printer body (1). Reference numeral (63) is a drum gear (insulating resin material) as a relay member, and the slip ring (57) is caulked to form a slip ring (5) on the outer peripheral side.
7) is connected to the contact (80) from the connecting piece (78) through the spring (79). Further, the slip ring (57) on the inner peripheral side is connected to the contact (80) through the spring (79) from the connecting piece (65). A holding plate (insulating material) (69) is attached so that the connecting pieces (65) (78) do not float.

(77) is an insulating cover, which is attached to the drum gear (63). The drum gear (63) is attached to the printer body (1) by a C ring (74) via a bearing (67).

The power receiver (56) has an insulating ring (81) inside the flange (72).
(82), terminal plate (83), and power receiving pin (73). The heater support metal fitting (76) supports the heater (75).

When the drive pin (71) is removed from the recess (70) by pulling out the drum shaft (55), the power receiving pin (73) is also removed from the recess (85) having the contact (80), and the photoconductor drum (2) is removed. It can be attached and detached in the longitudinal direction.

Thus, the power transmission section (66), the relay member (drum gear) (6
3), the power receiving unit (80) is individually assembled to simplify the structure.

The outer peripheral portion of the drum gear (63) is attached to the printer body (1).
A ring-shaped flange (64) is provided to form a dustproof chamber (58), and a sealing material (61) such as polyurethane is interposed between the flange (64) and the printer body (1) to completely prevent dust. There is.

Moreover, although the power transmission contact piece (59) usually requires maintenance, the power transmission contact piece (59) can be removed by detaching the power transmission section (66) from the printer main body, which provides good serviceability.

(G) Effect of the Invention As is apparent from the above description, the present invention has the following effects.

Since the power transmission section and the relay member are assembled respectively, the structure is simplified and the handling is easy.

Since the power transmission unit is attached from the outer peripheral side of the main body of the image forming apparatus, the power transmission unit can be independently attached / detached regardless of other components.

Maintenance such as inspection of the slip ring or replenishment of the lubricant can be executed from the opening, and workability is excellent.

Since the sliding contact portion is surrounded by a flange or the like, it is protected from toner powder, paper powder and the like.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a main part of a sheet feeding device according to an embodiment of the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is a sectional view in the longitudinal direction thereof, and FIG. 4 is a sectional view of an electrostatic printer. . (2) …… Photosensitive drum, (57) …… Slip ring,
(61) …… Seal material, (63) …… Drum gear, (64)…
… Flange, (66) …… Power transmission part, (71) …… Drive pin,
(75) …… Heater, (80) …… Power receiving part

Claims (1)

[Scope of utility model registration request] 1. A photosensitive drum having a heater supported by an image forming apparatus main body, a relay member coaxially removably mounted on an end surface of the photosensitive drum and having a slip ring, and the slip ring. A power transmission unit that slidably contacts the power transmission unit that supplies power to the heater of the photosensitive drum from the power transmission unit via the slip ring, wherein the relay member covers the power transmission unit that slidably contacts the slip ring. A flange provided on the image forming apparatus main body, an opening formed in the apparatus main body so that the power transmitting unit is attached and slidably contacts the slip ring from the outer peripheral side of the image forming apparatus main body, and the flange is provided on the image forming apparatus main body. And a sealing member provided so as to prevent the sliding contact of the power transmission unit with respect to the slip ring from being separated by the flange and the sealing member. Power supply device characterized in that it is carried out in dustproof chamber.