JPH05910Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a charging device for an electrophotographic copying machine that has a corona discharge wire and performs uniform charging by corona discharge.

[Prior Art] A charging device may be provided as a single unit within an electrophotographic copying machine, or may be part of a composite device that is integrated with a photoreceptor and a cleaning device.

In the former, end blocks were fixed to both ends of the charge casing, the ends of the charge wire were stretched around the terminals and anchors therein, and then the end blocks were covered. In the latter case, the corona discharge wire was either disposable without being replaced, or the charge wire was replaced after the end block cover was attached and removed, as in the former case.

However, if the charge wire is disposable, it is uneconomical, and in other cases, it is difficult to insert wire anchors, springs, etc. into the narrow space of the end block.

[Objective] Therefore, an object of the present invention is to improve the replaceability of a charge wire in a charging device.

[Structure] The structure of the present invention will be explained in detail based on an embodiment shown in the drawings.

The embodiment shown in the drawings shows a composite device in which a photoreceptor, a charging device, etc. are integrated, and FIG. 1 is a perspective view of the composite device, and FIG.
X-ray sectional view, Figure 3 is a cross-sectional view with the casing removed, Figure 4 is an enlarged perspective view of the end of the casing on the equipment side, Figure 5 is an enlarged view of the terminal attachment part at the end of the casing on the equipment side, and Figure 6 This figure is a plan view of another embodiment of the terminal, and FIG. 7 is an enlarged view of another embodiment of the charge wire attachment portion.

Composite device 1 in which the charging device of the present invention is installed
The charging device 2, the cleaning device 3, and the photoreceptor portion 4 are integrally constructed.

The charging device 2 in the composite device 1 that is fixed on the composite device side is the device side casing 2.
1 and a terminal 27 integrally molded therewith.

Inside both ends of the device side casing 21, a wire support portion 20 (a fourth
) are provided on the upper surface of the wire support portion 20, and V-shaped wire support grooves C and D that determine the gap between the charge wire 22 and the photoreceptor, and rib portions 2
1b.

The power supply connection terminal 27 has a curved tip as shown in FIG. 5, and the tip 27a is fixed to the end of the casing 21 so that the height of the tip 27a is slightly lower than the V-shaped groove D of the wire support portion 20.

On the other hand, a conductive charge casing 24 engages with this casing 21. A charge wire 22 is provided at both ends of the charge casing 24.
and an insulating member 2 on which a column 23 for tensioning a tension spring 26 connected thereto is vertically provided.
5 is fixed. This strut 23 has a two-stage diameter of 23
a, 23b, and the height of the second stage 23b is at a position lower than the grooves C, D (the fulcrum of the charge wire) of the wire support part 20 when the device side casing 21 and the charge casing 24 are engaged. (In other words, a position closer to the photoreceptor drum 4)
It is configured to be.

Charge casing 24 to device side casing 2
1, one of the struts 23 is fitted into the curved tip 27a at the tip of the terminal 27 on the casing side, and the charge wire 22 is passed through the V-shaped grooves C and D on the upper surface of the wire support section 20. The terminal tip portion 27a and the support column 23b for fixing the charge wire 22 are both located closer to the photoreceptor 4 than the V-shaped wire support grooves C and D of the wire support portion 20, so that the device side casing 21 and the charge casing 24 are When the charge wire 22 is engaged with the V-shaped wire support groove C,
D to ensure that the wire is stretched securely and to keep the height of the charge wire 22 from the photoreceptor 4 constant.
Further, an insulating member 25 provided on the charge casing 24 comes into contact with the rib portion 21b of the wire support portion 20 to determine the height of the charge casing 24.

In this way, by attaching and detaching the charge casing 24 to and from the device side casing 21 using a click method to prevent it from coming off, the charge wire 22 can be replaced with a single touch without any tools. If the parts of the charge casing 24 that are removed (the wire, the casing, etc.) are set as consumable parts (consumable parts), replacing the charge wire will be a very easy task. Also, if you only need to replace the charge wire, the charge wire 22, spring 26
It has the advantage that it is much easier to do than inserting wire anchors, springs, etc. into the suspended structure.

Furthermore, in the case of the equipment side casing and the charge casing, even if the charge casing 24 is fixed with insulating screws instead of the click method, the work is not as difficult as the one on the left, and neither method will impair the effectiveness of the present invention. isn't it. In addition, terminal 2
7 has a donut-shaped tip 2, as shown in Figure 6.
It may be in the shape of 7', or it may be in a shape that comes into contact with the charge wire as appropriate. In addition, when the device side casing and the charge casing are engaged, the grooves C and D of the wire support part, the terminal tip,
It is only necessary that the position of the support is lower than the wire attachment part of the support, and depending on this positional relationship, the charge wire 22
Thus, pressure contact between the terminal 27 and the groove D is guaranteed.

In addition, in this example, the insulating member at both ends is provided with struts and a tension spring is attached to the corona wire side. can get. That is, as shown in FIG.
A protruding part 25'' is provided to make a part of 5' elastic, and when the casing 24 is set in the device side casing 21 and the wire is pulled by the grooves C and D, the charge wire anchor This is achieved by devising the shape of the elastic part so that the part C is lower than the part C. In this way, the protruding part 25'' of the insulating member 25' acts as a spring, so the tension spring is No longer needed.

[Effects] The present invention can be applied to a charger with a charge wire stretched, regardless of whether the charging device is installed as a single unit in a copying machine or is integrated with a photoreceptor. The casing can be removed from the device side casing to easily replace the charge wire.Furthermore, if the charge casing part is replaced as a consumable part, operation time can be shortened and replaceability improved. . When the charge casing and the device side casing are locked, both ends of the charge wire
Since the fulcrum of the charge wire supporting part is closer to the photoconductor, the charge wire is stretched at a precise position from the photoconductor, and its position remains constant at all times, so it is necessary to consider the charge wire tension position when replacing the charge wire. Moreover, the charge wire can be connected to the terminal provided on the device side casing by pressure contact.

When the charge wire 22 is stretched between both struts of the charge casing, the charge wire 22 is pulled and engaged in a straight line as shown in FIG. 3 with a pulling force smaller than that shown in FIG. Therefore, there is no risk of accidentally applying excessive pulling force, which would occur if the charge wire is immediately locked in a bent use state at the wire support part, and the charge wire will be disconnected. can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the composite device, Fig. 2 is a sectional view taken along line X-X of the charging device in Fig. 1, Fig. 3 is a cross-sectional view when the charge casing is removed from the casing, and Fig. 4 is a cross-sectional view of the charging device shown in Fig. 1. FIG. 5 is an enlarged view of the terminal attachment part at the equipment side casing end, FIG. 6 is a plan view of another embodiment of the terminal, and FIG. 7 is another embodiment of the charge wire attachment part. An enlarged view of the example. DESCRIPTION OF SYMBOLS 1... Composite device, 2... Charging device, 4... Photoreceptor, 20... Wire support part, 21... Device side casing, 22... Charge wire, 23... Support column, 24... Charge casing, 25 ... Insulating member, C, D ... Wire support groove, 27 ... Power supply connection terminal.

Claims (1)

[Scope of utility model registration request] A charge casing in which an insulating member having struts for stretching a charge wire is fixed at both ends and the charge wire is connected between the two struts, a wire support part that supports and positions the charge wire, and the strut. and a device-side casing provided with a power supply connection terminal having a curved tip so as to engage with the charge wire and conduct with the charge wire, and with the charge casing locked to the device-side casing, When the positioning fulcrum of the part, the conduction terminal, and the locking parts at both ends of the charge wire suspended from the support are successively located closer to the photoconductor side, and the charge casing and the apparatus side casing are locked, A charging device for an electrophotographic copying machine, characterized in that the charge wire is connected to a power supply connection terminal at the same time as the charge wire is positioned.