JPS6027402Y2 - Dry developer lower guide - Google Patents

Description

[Detailed description of the invention] This invention is a dry developing device lower guide that guides the recording paper that is fed in the vicinity of the toner roll in a direction perpendicular to the axis of the toner roll in a rotary dry developing device used for facsimiles and the like. This is related to the improvement of.

FIG. 1 shows an outline of a conventional dry type developing device that develops an electrostatic latent image on a recording paper that is fed close to a toner roll in a direction perpendicular to the axis of the toner roll using toner that adheres to the surface of the toner roll.

In the figure, 1 is a toner roll, and 2 is a lower guide.

Although not shown in detail, the toner roll 1 consists of a magnetic roll and a sleeve surrounding the magnetic roll, and by rotating the magnetic roll clockwise in FIG. 1, the surface of the toner roll 1 (specifically, The toner 30 adhering to the surface of the sleeve moves in the direction of arrow A (counterclockwise), and is guided by the lower guide 2 between the toner roll 1 and the lower guide 2, and the electrostatic latent on the recording paper is sent in the direction of the arrow. It adheres to the image and is developed.

The lower guide 2 is made of a non-magnetic material and is provided facing the toner roll 1 with a predetermined gap therebetween.

On the surface of the lower guide 2 facing the toner roll 1, a plurality of inclined notches 3 are formed by machining in the recording paper feeding direction, as shown in detail in FIG.

The reason why the cutout 3 is provided in the lower guide 2 is that a flat guide has a large contact area with the recording paper being fed, and the back side of the recording paper will become dirty due to residual toner on the guide that does not easily return to the toner roll. This is to solve the drawback, and the residual toner can pass through this notch 3 and return to its original state.

However, with the conventional lower guide of this shape,
It is not possible to completely erase the dirt on the back surface of the recording paper, it is not possible to collect and recover the fallen toner, and there are disadvantages in that it takes time and effort to form the notches 3, resulting in high cost.

The present invention is intended to solve the above-mentioned drawbacks, and aims to provide a low-cost lower guide that can eliminate dirt on the back side of recording paper and dirt on other mechanisms caused by fallen toner.

Next, embodiments of the present invention will be described with reference to FIGS. 3 to 7.

In the drawings, members having the same structure as the conventional one are represented by the same symbols as the conventional one.

A first embodiment is shown in FIGS. 3 to 5.

FIG. 3 is a perspective view of the lower guide 10, which includes a pair of gap retaining members 12 (the figure shows only one on one side) and a plurality of rod-shaped guide members 13 in the case 11. At the same time, move the storage box 14 into the case 11 in the direction of arrow B.
It is stored so that it can be pulled out in any direction.

The case 11 has a hole-shaped cross section and is longer than the toner roll.

The holding member 12 is attached to both ends of the flanges 15 and 15 of the case 1, and a half is provided at the center of the upper part of the holding member 12 to fit into both ends of the toner roll and maintain the gap between the toner roll and the lower guide 10. A cylindrical cutout 16 is provided.

Each guide member 13 has a flange 15 between both holding members 12.
, 15 at equal intervals.

These case 11, gap holding member 12, guide member 1
3 and the storage box 14 are each made of a non-magnetic material such as stainless steel or brass.

This lower guide 10 is connected to the toner roll 1 as shown in FIG.
In this case, the lower guide 10 is fixed by fitting the notches 16 of the gap holding member 12 to both ends of the toner roll 1, as shown in FIG.

In this state, each guide member 13 faces the recording paper traveling direction shown by the arrow in FIG. 4, and its upper surface faces the toner roll 1 with a predetermined gap therebetween.

When developing the recording paper by letting the guide member 13 of the lower guide 10 guide its back surface in the direction of the arrow in FIG. 4, the recording paper only contacts the lower guide 10 at the upper surface of each guide member 13 Therefore, the contact area is very small, and the residual toner 30 passes between the guide members 13 and easily returns to the toner roll, thereby eliminating stains on the back surface of the recording paper.

Furthermore, even if toner falls from the toner roll, the toner falls into the storage box 14 and is collected, thereby preventing other mechanisms from becoming contaminated.

The toner in the storage box 14 can be collected by pulling out the storage box 14.

A second embodiment is shown in FIGS. 6 and 7.

FIG. 6 is a perspective view of the lower guide 20, which includes:
As in the previous example, a guide plate 21 made of a non-magnetic material is fixed on the flange 15.15 of the case 11 that houses the storage box 15.

The guide 21 is easily formed by pressing a plate of stainless steel, brass, etc., and includes a plurality of protrusions (guide members) 22, a plurality of openings 23, and a pair of gap retaining members 24. There is.

In this case, the protrusion 22 performs the same function as the guide member 13 of the previous example, and the opening 23 allows the toner to fall into the storage box 15, making it possible to achieve the same effect as the previous example.

As described above, according to the present invention, the recording paper is fed with its back side in contact with only the top surfaces of the plurality of guide members, so the contact area is very small, and the residual toner is removed from each guide member. Since the paper is designed to easily return to the toner roll through the gaps, it is possible to eliminate dirt on the back side of the recording paper, and there is no need to form notches through mechanical processing as in the past, reducing costs. It is possible to achieve various excellent effects.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a conventional dry type developing device, FIG. 2 is a perspective view of its lower guide, FIG. 3 is a perspective view showing a first embodiment of the dry type developing device lower guide according to the present invention, and FIG. 5 and 5 are side and front views showing the installation procedure, FIG. 6 is a perspective view showing the second embodiment, and FIG. 7 is a side view showing the installation procedure. Toner roll, 10.20 is a lower guide, 11 is a case, 12.24 is a gap holding member, 13
is a guide member, 14 is a storage box, 15 is a flange, 21 is a guide plate, 22 is a protrusion (guide member), 23 is an opening,
30 is toner.

Claims (1)

[Scope of utility model registration request] In a dry type developing device that develops an electrostatic latent image on a recording paper that is fed close to a toner roll in a direction perpendicular to the axis of the toner roll with toner that adheres to the surface of the toner roll, A case made of a non-magnetic material having an opening is provided with the end face of the opening facing the toner roll with a predetermined gap therebetween, and a plurality of casings of a predetermined height extending in the feeding direction of the recording paper are provided on the end face. Non-magnetic recording paper guide members are installed at a predetermined pitch, and a non-magnetic storage box is removably provided in the case to collect toner that falls from the surface of the toner roll. Features a dry developing device lower guide.