JPS634225Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a developing head of a wet type developing device.

For example, in a developing head of a wet type developing device such as an electronic copying machine, in which a developer is sprayed from a slit-shaped spout of the developing head onto the image forming surface of an image support passing through with the electrostatic latent image forming surface facing downward. The system changes the developer fluid flowing from the developer tank into a gentle flow, so that it is ejected as a uniform flow across the elongated slit-shaped spout, and prevents air from accumulating in the developing head. , to prevent bubbles from forming in the developer solution.
It is necessary to prevent uneven development and white spots in development, and various proposals have been made.

The object of the present invention is to provide a developing head that satisfies the above requirements for a developing head, has a simple structure, and is easy to manufacture.

The details of the invention will be explained by way of an example shown in the figures.

In FIGS. 1 and 2, the developer head 1 has two developer head halves 2 and 3 which are arranged vertically to each other. One developing head half 2
A connecting member 4 (referred to as the first half) is attached by screwing or the like, and a supply pipe 7 is connected to the connecting member 4 to introduce a developer supplied from a developer tank 5 by a pump 6 or the like. There is.

A first liquid chamber 8 extending in the longitudinal direction of the slit is formed in the first half 2. From the viewpoint of manufacturing, it is convenient for the first liquid chamber 8 to be formed as a recessed portion that opens toward the other developing head half 3 (referred to as the second half) as shown in Fig. 1, but it may also be formed as a sealed hollow portion.

The first liquid chamber is provided with one or more inlets at appropriate intervals for inflowing the developer, and communicates with the connecting member 4.

A second chamber 9 is formed in the second half 3 and extends in the length direction of the slit. It is convenient for manufacturing purposes that the second chamber is formed as a recess that opens on the surface facing the first half 2 as shown in FIG. You can also do it.

When the first half 2 and the second half 3 are joined and assembled, the first chamber 8 and the second chamber 9 are arranged in a mutually shifted state, for example, in a vertically shifted state. It is formed like this. At that time, the first room 8 and the second room
The chamber 9 is communicated with through a small opening 10. For example, as shown in FIG.
The chambers 9 are communicated with each other through an opening having a width b.
In the example shown in the figure, the first chamber 8 and the second chamber 9 are in direct communication, but if the first chamber 8 and the second chamber 9 are formed as hollow parts, a communication path with a width b is provided in the first half 2. and will be formed in the second half 3.

The cross-sectional area of the opening that communicates the first chamber 8 and the second chamber 9, that is, the product of the width b and the total length l of the chambers 8 and 9, is the first
the cross-sectional area of the inlet for developer solution that opens into chamber 8;
For example, if the opening diameter of the connecting member 4 is d, the area is set to be equal to or slightly smaller than π/4 d ² × number of pieces.
Flows into chamber 9 as a uniform flow rate over the entire length,
The developer is then turned into a gentle flow.

The slit opening 11 of the second half 3 is inserted into the first half 2.
The joint surface of the second half body 3 is provided at the joint part with the second half body 3.
Photosensitive paper 13 guided from chamber 9 by guide 12
By shifting the distance to the surface facing the slit to the right in the figure from the other joint surfaces by an amount corresponding to the slit width S, the slit can be easily formed by simply joining the first half 2 and the second half 3. 11 is formed, which is convenient for manufacturing. However, the present invention is not limited to this example, and the slit opening 11 can be formed in any other location so as to communicate with the second chamber 9.

The first chamber 8 and the second chamber 9 are formed as holes penetrating the entire length of the first half body 2 and the second half body 3, respectively, and when the two halves 2 and 3 are assembled, the first chamber 8 and the second chamber 9 are
Both end surfaces where the chamber 8 and the second chamber 9 are still open are covered with lids 14.
Manufacturing and assembling is easy if the structure is sealed. Naturally, it is also possible to have a structure in which the chambers 8 and 9 are closed by the end walls of the halves 2 and 3 without penetrating them. In this case, a lid is not necessary.

When installed as a developing device in the first and second chambers, the surface that becomes the ceiling surface is discharged to the second chamber 9 through the opening 10 or outside through the slit opening 11 without creating any air pockets. It is formed as an inclined surface that allows for

The developing head 1 is surrounded by a collecting tray 15, and the remaining developer jetted out from the slit opening 11 flows around the circumferential surface of the developing head 1 and flows into the collecting tray 15. The developer tray 15 is provided with one or more discharge ports 16, each of which is connected to the developer tank 5 through a discharge pipe 17. Therefore, as is clear from FIG. 2, the developer is used in circulation.

A collecting tray 15 is appropriately attached to the developing head 1, and in the example shown, the spacing is maintained by a ring 18, and the connecting member 4 is also used for fixing the collecting tray.

With this invention, the structure is simple and the number of parts is small.
A developing head that is easy to manufacture was obtained.

The developing head according to the present invention can be used even in a tilted state, and has a wide range of applications.

With this invention, the structure is simple and it is easier to achieve machining accuracy.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a developing head according to the present invention, and FIG. 2 is a side view with a portion of FIG. 1 removed. DESCRIPTION OF SYMBOLS 1... Development head, 2, 3... Half body, 4... Connecting member, 8, 9... Chamber, 10... Opening, 11...
...slit opening.

Claims (1)

[Scope of utility model registration request] Consisting of two halves joined in the vertical plane,
Each half has one chamber formed over the entire length, and the chambers are arranged vertically, with the developer inlet opening opening in the chamber located on the bottom and the chamber located on the top. 1. A developing head for a wet type developing device, characterized in that a slit opening is opened in the chamber in which the two chambers are exposed, and the two chambers are communicated with each other by an opening that acts as a diaphragm.