JPH01120576A - Electric discharge device - Google Patents

Abstract

PURPOSE:To constitute an electric discharge device in such a manner that a charge wire or tension spring can be mounted in a tension releasing position by forming a piece of holding members of the discharge device movably between the tension applying position where tension is applied to the charge wire and the tension releasing means which is nearer the other holding member than said tension applying position. CONSTITUTION:The electric discharge device is used for an electrophotographic copying machine and a toner image is formed by a copying process on the surface of a rotating drum photosensitive body 51. The toner image is transferred onto transfer paper 52 by the discharge of a transfer charger 54. The 1st holding member 4 and the 2nd holding member 56 are disposed to front and rear end blocks 3, 6 respectively, provided between this charger 54 and a separating charger 55. The push down is released by a rib 9 when the end block cover 8 of the block 3 is removed. The member 4 is then rotated to the low face of the block 3 and the charge wire 1 is moved from the tension applying position to the tension releasing position near the member 56.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a discharge device that performs discharge by applying a voltage to a charge wire stretched between at least two holding members. This discharging device is used, for example, to charge or neutralize a photoreceptor in an image forming apparatus such as a copying machine, facsimile machine, or printer.

One end of the above-mentioned discharge device has a structure shown in FIG. 7 at one end thereof. In this conventional device, a groove 50 and a boss 15 are formed in the end block 14, and the charge wire 1 fitted in the V groove 50 is hung on the boss 15 via the tension spring 5 or directly.

An appropriate tension is applied to the charge wire 1 in this suspended state.

In this conventional device, when manufacturing the device, the hook portion of the sedge ring 5 must be hooked onto the charge wire 1 while being stretched. As a result, the charge wire 1 may be cut or the spring 5 may be thrown out, resulting in poor workability.Also, when setting the loop-shaped charge wire 1 in two V-grooves, the spring 5 may be cut in advance.
If you try to set it after hooking it to the machine, the work efficiency will be very poor. Furthermore, there is a high possibility that the charge wire 1 will be cut.

1-E An object of the present invention is to provide a discharge device in which a charge wire can be easily stretched, and there is no fear of the charge wire being cut or the spring being lost.

Dan-1/1 The present invention is a discharge device that performs discharge by applying a voltage to a charge wire stretched between at least two holding members, wherein at least one of the holding members is connected to the charge wire. a tension applying position, which is a position where tension is applied to the
This discharge device is characterized in that it is movable between the tension applying position and a tension relaxing position which is a position closer to the holding member of the pond than the tension applying position.

Hereinafter, the present invention will be explained based on Examples.

FIG. 1 shows an embodiment in which a discharge device according to the present invention is used as a transfer charger and a separate charger of an electrophotographic copying machine. In the figure, a toner image is formed on the surface of a drum-shaped photoreceptor 51 (only a portion of which is shown in the figure) rotating in a clockwise direction by a well-known copying process. Transfer paper 5 conveyed from a paper feeder (not shown)
2 is fed to the photoreceptor 51 by a registration roller 53 at the same timing as the toner image, and is superimposed on the toner image. Then, due to the discharge of the transfer charger 54, the toner image on the photoreceptor 51 is transferred to the transfer paper 5.
Transferred onto 2. Thereafter, the transfer paper 52 on which the toner image has been transferred is separated from the photoreceptor by weakening its electrostatic adhesion to the photoreceptor due to the discharge of the separation charger 55, and is conveyed to a fixing device (not shown).

The transfer charger 54 and the separation charger 55 include a second
As shown in the figure, a front end block 3.3 and a rear end block 6.6 are provided. front end block 3
, 3, a first holding element 4.4 is arranged, and in the rear end block 6.6 a second holding element 56.56, which is designed as a spring terminal, is arranged. A charge wire 1 is stretched between the first holding member 4 and the second holding member 56 via a V-groove 2 formed in each end block. Tension on the charge wire 1 is applied by tension springs 5, 5 provided between the charge wire 1 and the first holding member 4. The tension spring 5 can also be provided not on the first holding member 4 side but on the second holding member 56 side. Charge wire 1
A high voltage is applied to the second holding member or spring terminal 56, thereby causing a corona discharge.

As shown in FIG. 3, the first holding member 4 is rotatably supported by a bin 57 on a support base 7 formed within the front end block 3. The rear end of the first holding member 4 is pressed down by the rib 9 of the front end block cover 8, and in this state, a predetermined tension is applied to the charge wire 1. Furthermore, Figure 2 shows the front end block 3.
This figure shows the state in which the front end block cover 8 has been removed. Although a rear end block cover is originally attached to the rear end block 6, FIG. 2 shows a state in which this cover has been removed.

When the end block cover 8 is removed from the front end block 3 in the state shown in FIG. 3, the pushing down by the ribs 9 is released, so the first @ holding member 4 has its lower right end connected to the end block 3, as shown in FIG. Rotate clockwise until it hits the bottom of 3. Due to this rotation, the spring hook portion 4a of the first holding member 4 is moved to a second position compared to the case shown in FIG.
Position approaching the holding member 56 (Fig. 2) (tension relaxation position)
As a result, the tension on the charge wire 1 is relaxed.

Since the tension on the charge wire 1 is relaxed in this way, the wire can be replaced extremely easily, and the wire 1 will not be cut or the spring 5 will not be thrown out due to excessive force.

After replacing the wire with a new one, simply attach the end block cover 8 to the front end block 3, and the rear end of the first holding member 4 will be automatically pushed down by the rib 9, and the charge wire 1 will be Tension is automatically applied.

FIG. 5 shows another embodiment of the invention. In this embodiment, the first holding member 34 is configured to rotate around a bin 30 that projects upward from the bottom surface of the front end block 3. That is, whereas the first holding member 4 in the previous embodiment shown in FIG. It rotates in a plane parallel to the bottom of the block.

In FIG. 5, two small projections 12.12 and 13.13 are provided on the side wall of the front end block 3. In the state shown in FIG. 5, the first holding member 34
The tip of the knob 34a is stopped by the right stopper 13.13. In this state, the tension spring 5 is pulled to the left in the figure to apply a predetermined tension to the charge wire 1.

When installing a new charge wire, move the knob 34a of the first holding member 34 between the right stopper 13 and the left stopper 1.
2 and rotate the first holding member 34 slightly clockwise.

As a result, the first holding member 34 moves to the tension relief position where it approaches the other holding member (second holding member 56 in FIG. 2). As a result, the charge wire 1 or the tension spring 5 can be easily attached.

Circle-1 According to the present invention, since the charge wire or tension spring can be attached at the tension relief position, there is no need to worry about the charge wire being cut or the spring being lost, and these can be easily attached.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of essential parts of an electrophotographic copying machine using a discharge device according to the present invention, and FIG. 2 is a plan view of an embodiment of the present invention.
3 and 4 are side sectional views of main parts showing the movement of the holding member in this embodiment, FIG. 5 is a plan view of main parts of another embodiment of the present invention, and FIG. 6 is a holding member in this embodiment. FIG. 7 is a plan view showing the main parts of a conventional discharge device. 4.56...Holding member

Claims (1)

[Claims] In a discharge device that performs discharge by applying a voltage to a charge wire stretched between at least two holding members, at least one of the holding members is located at a tension applying position where tension is applied to the charge wire. and a tension-relieving position, which is a position closer to another holding member than the tension-applying position.