JPS60207161A - Supporting device for electrostatic charging device - Google Patents

Abstract

PURPOSE:To position an electrifier casing and a magazine by direct contacting and improve the accuracy between the distance between an electrifier wire and a body to be charged electrifically by fixing an electrifier unit to a main body with one screw, and mounting it in a flexible state based upon a leaf spring. CONSTITUTION:The electrifier casing 12 has a support plate part 15 which spreads crossing the extension direction of the wire, the leaf spring 16 is fixed to its nearly center part with the screw 17, and the free end of the leaf spring 16 is extended to the casing 12 so that a V-shaped space is formed. When the support plate part 15 is fixed to the frame plate 18 of an exposure optical system 7 across the leaf spring 16, the electrifier unit 6 is in a floating state as shown by a chain line because of the flexibility of a bridge part 19 while the magazine 2 is detached, but when the magazine 2 is attached, the magazine 2 contacts the electrifier unit 6 directly to hold the distance between the wire and the surface of a photosensitive body belt 1 with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for a charging device in a copying machine or the like.

Conventional blood suction In conventional copiers, etc., a guide rail is provided on the machine frame,
The rail supports the charger unit so that it can be taken in and out. Although high accuracy is required for the distance between the wire of the charger and the object to be charged, such as a photoreceptor, the charger cannot be brought into direct contact with the object to be charged. Conventionally, distance accuracy has been achieved indirectly by relative positioning between a support shaft of a charged object, such as a photoreceptor, and a guide rail that supports a charger. In the case of indirect positioning, the relative position error between the guide rail and the charger unit overlaps with the position error of the wire within the charger unit. The accuracy of the distance could not be expected to be very high. Furthermore, there is a drawback that extra parts such as guide rails are required to support the charger unit.

The present invention solves the problem in the conventional charger unit that direct relative positioning cannot be performed between the charged object and the charger unit, and improves the accuracy of the distance between the charged object and the charger wire. The purpose is to increase.

The structure of the present invention that achieves the above objects will be explained in detail with reference to embodiments shown in the drawings.

In FIGS. 1 and 2, a charged member 1 is formed as a photosensitive belt of a copying machine, and is supported in a magazine 2 by rollers 3 in the form of an endless belt.

As shown in FIG. 2, the copying machine has an upper body 5 pivotally connected to a lower body 4 so as to be vertically openable and closable. The magazine 2 can be easily attached and detached when the upper body 5 is opened upward as shown in FIG.

A charger unit 6 is attached to the upper body 5 to charge the photoreceptor belt 1 of the magazine 2 when it is attached.

In the case of a copying machine, as is already known, an exposure optical system 7, a developing device 8, a transfer charger 9, a fixing device 10 and a paper feed device 1 are used.
1st prize will be provided.

As shown in FIG. 3, the charger unit 6 includes a charger casing 12 and end blocks 13 attached to both ends of the charger casing 12.

As shown in FIG. 4, a corona discharge wire 14 is provided that is stretched inside the charger casing 12 and held at both ends by holding members in the end block 13.

A support plate portion 15 (FIG. 3) is formed in the charger casing 12 and extends in a direction crossing the direction in which the wire 14 extends. The support plate portion 15 is formed to extend in a plane slightly shifted toward the wire 14 from the lower surface (the upper surface in FIGS. 3 and 4) of the charger casing 12.

A leaf spring 16 is fixed by a screw 17 at a position corresponding to approximately the center of the support plate portion 15 in the direction in which the wire 14 extends. In this case, the free end of the leaf spring 16 is connected to the charger casing 1.
2 and is slightly inclined with respect to the surface of the support plate part 15, and a substantially V-shaped space is formed between the support plate part 15 and the support plate part 15.

Although the screw 17 can be rotated by a washer, it is set aside in the support plate portion 15 so that it cannot be easily removed.

A charger unit configured as shown in FIG. 3 is fixed to a main body, for example, the upper main body of FIGS. 1 and 2.

As shown in FIG. 5, it is fixed, for example, to the frame plate 18 of the exposure optical system 7 of the upper body with the screws 17.

When the support plate portion 15 is fixed to the frame plate 18 with the leaf spring 16 sandwiched therebetween, the charger casing 12 is affected by the pressing force of the leaf spring 16 and the bridge connecting the charger casing 12 and the support plate portion 15. The flexibility of the portion 19 allows it to be held in the tilted position shown by the chain line in FIG.

The charger unit 6 is supported by a frame plate 18, that is, the upper body 5, by a screw 17 at one point approximately in the center of the support plate portion 15.

The more the corner part 20 forming the edge of the frame plate 18 in contact with the leaf spring 17 overhangs from the support plate part 15 toward the bridge part 19, the more the charger casing I2 is shown in solid line against the leaf spring 17. The resistance force when pushing into position becomes large. Conversely, this indicates that the pressing force against the member pressing the charger casing 12 becomes large.

In FIG. 2, when the magazine 2 is removed, the charger unit 6 is in a free state and therefore occupies the position indicated by the chain line in FIG.

When the magazine 2 is attached, the charger unit 6 is subjected to an oblique pressing force toward the upper left in FIG. 5 by the casing of the magazine 2. At this time, the surface portion 21 of the magazine casing at a predetermined position is connected to the end block 1 of the charger unit 6.
The reference surface portion 13a of No. 3 is brought into contact with the reference surface portion 13a.

In the magazine 2, high dimensional accuracy can be obtained between the surface of the photoreceptor heald 1, which is the object to be charged, and the surface portion 2, and in the charger unit 6, the reference surface portion 13a and the wire 1 can be
4, high dimensional accuracy can also be obtained. In addition, since the reference surface portion 13a and the surface portion 21 are in direct contact, the same degree of precision can be obtained as in direct dimensional positioning between the layer 14 and the surface of the photoreceptor heald 1.

Although the above embodiment has been described with respect to a photoreceptor belt, it can also be applied to a photoreceptor drum by providing a flange surface 3 corresponding to the above-mentioned surface portion 21, for example.

According to the invention, the charger unit is fixed in one place by a screw and is flexible under the action of a leaf spring, so that it has a great degree of freedom of movement.

Therefore, when a magazine, which is an object to be charged, is attached, the charger casing is pressed against the magazine in a state where it easily adapts to the attitude of the magazine, and the charger casing and the magazine can always be accurately positioned relative to each other through direct contact. can.

The present invention enables accurate positioning with a simple structure. Therefore, even an amateur can maintain the highly accurate position of the charger even if the magazine is replaced.

[Brief explanation of drawings]

1 and 2 are schematic cross-sectional views of a copying machine that utilizes the present invention. FIG. 1 shows the upper body in a closed state, FIG. 2 shows the upper body in an open state, and FIG. 3 shows the present invention. Charger Uniso 1 related to
4 is a partially sectional side view in a state where the charger unit is in contact with the magazine, and FIG. 5 is a partially sectional front view in a state where the magazine is attached to the upper body. 1... Charged object 2... Charged object support member (magazine) 5... Main body
6... Charger unit 12... Charger casing 13... End block 14... Wire 15... Support plate portion 16... Screw 17... Leaf spring

Claims (1)

[Claims] In a device including a charger unit and a charged object that is movable relative to the charger unit, the charger unit includes a discharge wire, a charger casing that supports the discharge wire, and a charger casing that supports the charger unit. It has an extending support plate part, and a plate spring fixed by a screw to the central part of the support plate part in the direction in which the discharge wire extends, and the plate spring extends to the charger casing, and the plate spring extends to the charger casing. The contact position of the plate spring is slightly different in height from the surface of the support plate, the charger unit is fixed to the main body of the device by one of the screws, and the object to be charged is not connected to the charger unit. be formed so as to be relatively movable substantially parallel to the surface of the support plate portion or obliquely from the side of the charging support plate portion toward the charger casing side, and the object to be charged or the object to be charged 1. A support device for a charging device, characterized in that a surface of a member supporting the charger is formed so that a reference surface of a charger casing is in direct contact with the reference surface of the charger casing.