JPS59187367A - Adjusting device for corona discharge current - Google Patents

Abstract

PURPOSE:To reduce an error in corona discharge current adjustment and make an adjustment almost to a true value required during actual operation by applying a potential which is as high as the target surface potential of a photosensitive body to a surface conductor which faces a corotron. CONSTITUTION:A plate part 3 consists of a surface-side conductor 8 which faces the surface of the corotron 7 during adjustment, an insulator 9, and a reverse- surface side conductor 10; and a varistor 11 connected between the conductors 8 and 10 simulates the drum surface potential of the photosensitive drum on said conductor 8 on the side of the surface of the corotron 7 during the adjustment and its varistor voltage uses the same voltage as the surface voltage of the drum. When the corona discharge current of the corotron 7 is adjusted, a current flowing from the corotron 7 to an ammeter 14 through an adjusting jig 1 is measured, but the varistor 11 applies the specific potential as that in the actual copying operation to the surface potential 8, and an error is reduced by converting the current flowing to the adjusting jig 1 into the current flowing to the photosensitive body during the operation of the copying machine 4 to perform approximation to the true value, improving adjustment precision.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adjusting device used as a jig for adjusting the corona discharge current of a corotron such as a copying machine.

Conventionally, the corona discharge current adjustment jig did not take into consideration the surface potential of the photoreceptor when making adjustments, so the current flowing from the corotron to the adjustment jig did not flow to the photoreceptor during actual operation of a copying machine, etc. There is a disadvantage that the error is large when converted to current.

This invention has been made in view of this point, and aims to reduce the error when adjusting the corona discharge current so that the adjustment can be made closer to the true value required during actual operation. It is.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIGS. 1 and 2 show an overview of the configuration and adjustment method of an embodiment of the present invention, and show a case in which it is applied to a corotron around a photosensitive drum of a copying machine.

In Figure 1, (1) is an adjustment jig that is installed when adjusting the corona discharge current, and the mounting made of insulator is part (2).
1 and this mounting consists of a plate part (3) for current measurement provided in part (2), and as shown in Figure 2, the drum shaft for the photoreceptor drum of the copying machine (4) is used during adjustment. (5) To fix the part (2) with the fixing screw (6), the plate part (3) is made to face the corotron (7) whose corona discharge current is to be adjusted. The plate part (3) consists of a conductor (8) on the front side facing the corotron (7) side during adjustment, an insulator (9), and a conductor αQ on the bottom side, and in the illustrated example, the adjustment jig (1) A varistor αη is connected between the conductor (8) and α0.

The varistor αη is used to simulate the drum surface potential of the photosensitive drum on the conductor (8) on the side of the corotron (7) during adjustment, and the varistor voltage used is the same as the drum surface voltage.

On the other hand, a cord α is connected to the other conductor (10) of the plate portion (3), and as shown in FIG. Therefore, during adjustment, a varistor 0υ is inserted between the surface conductor (8) of the plate part (3) and the ground, thereby connecting the target photoconductor. The surface potential of the surface conductor (8) is equivalent to the potential of
It is now possible to give. That is, the drum surface potential of the photosensitive drum when an original is placed on the original table glass OQ of the copying machine (4) and a copying operation is actually performed is taken into consideration during the adjustment.

Therefore, when adjusting the corona discharge current of the corotron (7), measure the current flowing from the corotron (7) to the ammeter α via the adjustment jig (1), but even in this case, the varistor α applies a predetermined potential to the surface conductor (8) in the same way as during actual copying operation, and since the drum surface potential is taken into account, the current flowing through the adjustment jig (11) is applied to the copying machine (4). ) When converted into the current flowing to the photoreceptor during operation, the error becomes smaller, it can be brought closer to the true value, and the adjustment accuracy can be improved.

In addition, in the above embodiment, the conductor (8) of the adjustment jig (1),
A varistor aυ was connected between the conductor (
8) A constant voltage element having characteristics similar to a resistor or a varistor can also be used so that a predetermined potential can be applied to the device to create a state similar to that during actual operation. Further, such a resistor or constant voltage element may be made removable, replaceable, and short-circuitable.

As described above, the present invention can reduce the error when adjusting the corona discharge current, so that the adjustment can be made to approach the true value of the corona discharge current required during actual operation. It has a Q effect such as being able to improve adjustment accuracy.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of an embodiment of the present invention, and FIG.
The figure is an explanatory diagram showing the adjustment method. Code explanation

Claims (1)

[Claims] This device is used as an adjustment jig when adjusting the corona discharge current of a corotron in a copying machine, etc., and includes a surface conductor that faces the corotron during adjustment, and a A corona discharge current adjusting device characterized in that a resistor or a constant voltage element can be inserted for applying a predetermined potential to a surface conductor during adjustment.