JPS6128976A - Non-magnetic one component developing device - Google Patents

Abstract

PURPOSE:To prevent a developer from being spilt down from both end parts, and to form a uniform developer layer by providing a pressure welding member to a carrying body, on both ends of the tip part of a layer forming member. CONSTITUTION:Pressure welding members 8, 9 are provided on both end members in the longitudinal direction of a layer forming member 5, the pressure welding member 8 consists of a fur material 8a made of ''Teflon(R)'', a felt 8b and a pressing holder 8c, and the fur material 8a contacts to the layer forming member 5 and a carrying body 4, and it is welded by pressure to the layer forming member 5 and the carrying body 4 by the pressing holder 8c. The pressure welding member 9 also consists of a three-layer structure in the same way as the pressure welding member 8. A developer 1 is fed to the carrying body 4 by a carrying roll 3, and a thin layer of the developer 1 is formed on the carrying body 4 by a rotation of the carrying body 4, and the layer forming member 5. In this case, in both end parts in the longitudinal direction of the layer forming member 5, the developer 1 is scraped down from the surface of the carrying body 4 by the pessure welding members 8, 9, therefore, the developer 1 does not exist in both end parts, and the developer 1 is not spilt down.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a non-magnetic one-component developing device, in particular, to a non-magnetic one-component developing device, in which a developer supplied on a carrier is formed into a developer layer of a predetermined thickness by a layer forming member, and this developing device The present invention relates to a developing device that conveys a layer of agent to an electrostatic latent image and develops it into a visible image.

(Prior Art) In electronic copying machines and the like, a non-magnetic one-component developing device is used to develop an electrostatic latent image into a visible image. Conventionally, a developing device as shown in FIG. Are known. In addition,
FIG. 5 shows the apparatus shown in FIG. 4 as viewed from the direction of arrow C. In FIG. 4, the developer 1 is supplied into the hopper 2, and the carrier 4 and the transport roll 3 rotate in the directions of arrows A and B, respectively, that is, rotate in the same direction. Then, the developer 1 is transferred to a carrier 4 by a transport roll 3. A regulating member, that is, a layer forming member 5 contacts the carrier 4 with uniform pressure, and the layer forming member 5 forms the developer 1 into a developer layer 6 having a predetermined thickness. This developer layer 6 having a predetermined thickness is then conveyed to the electrostatic latent image on a holder (not shown), whereby the electrostatic latent image is developed into a visible image.

(Problems to be Solved by the Invention) In such a non-magnetic one-component developing device, a developer layer of a constant amount (thickness) is always formed on the carrier 4 along the longitudinal direction by the layer forming member 5. However, it is difficult to always supply a constant amount of developer 1. For this reason,
A problem has arisen in which the developer 1 spills from both ends of the layer forming member 5 in the longitudinal direction, as shown in FIG.

Therefore, an object of the present invention is to provide a non-magnetic one-component developing device that can form a uniform developer layer without developer spilling from both longitudinal ends of a layer forming member.

(Means and effects for solving the problem) The non-magnetic one-component developing device of the present invention supplies a developer to a carrier, forms a thin layer of developer on the carrier by a layer forming member, and In a non-magnetic one-component developing device that applies an electric charge, sends it to a holder that holds an electrostatic latent image, and deposits a developer on the electrostatic latent image to develop it into a visible image, the layer forming member is , which extends in the doctor direction with respect to the carrier and is disposed with a slight gap such that the tip thereof does not contact the surface of the carrier, and the tip of the layer forming member is disposed at both longitudinal ends of the layer forming member. It is characterized in that a pressure contact member is provided that presses both ends of the support member against the carrier.

(Example) Hereinafter, the present invention will be described in detail based on the drawings.

FIG. 1 shows a non-magnetic one-component developing device according to an embodiment of the present invention, and FIG. 2 shows the device shown in FIG. 1 as viewed from the direction of arrow E. As shown in FIG.

In FIG. 1.2, the developing device includes a hopper 2 that stores the developer 1, and the hopper 2 is provided directly above the carrier 4 in order to send the developer 1 onto the carrier 4 by gravity. ing. The developer 1 is deposited on the carrier 4 with a constant layer thickness by a blade-shaped layer forming member 5, and the developer layer 1 is deposited on the carrier 4 with a constant layer thickness.
At the same time, it is charged by frictional electrification. This developer layer is sent to a holder (not shown) such as a photoreceptor by the rotation of the carrier 4, and is deposited on the electrostatic latent image on the holder. This will be developed into a visible image. Note that the developer layer not used for development, that is, the developer 1, is removed from the surface of the carrier 4 by the transport roll 3 and returned to the hopper 2 again.

Note that the carrier 4 and the feeding roll 3 are indicated by arrows A, respectively.
Rotate in direction D. In addition, the layer forming member 5 is usually formed from a SUS 304 plate spring material with a thickness of 0.06 to 0.2 mm, and is directed in the doctor direction with respect to the carrier 4, that is, in the rotational direction of the carrier 4. It extends in the opposite direction to the direction of the arrow.

This layer forming member 5 has a length of about 10 to 40 mm in the rotational direction of the carrier 4 (direction of arrow Δ), and its tip 5
A is arranged with a small gap (about 1 to 3 IllI11) so that it does not contact the surface of the carrier 4. Note that the layer forming member 5 is held by a holder 7.

Pressing members 8 are attached to both longitudinal end members of the layer forming member 5.
9 is provided, and the pressure contact member 8.9 has a width of 5 to 20II1.
Both ends of the tip end of the layer forming member 5 are pressed in the direction of the carrier 4 within a range of m. That is, the pressure contact member 8.9 is 100
Both ends of the layer forming member 5 in the longitudinal direction are pressed with a contact stress of ~200'Og/order 2, so that both ends of the tip end of the layer forming member 5 come into contact with the carrier 4.

This pressure contact member 8 includes a Teflon bristles 8a, and the bristles 8a made of Teflon.
It consists of a felt (fell) 8b laminated thereon, and a pressing holder 80 laminated on the felt (fell) 8b, and the bristles 8a.
is in contact with the layer forming member 5 and the carrier 4, and is pressed against the layer forming member 5 and the carrier 4 by the pressing holder 8C. Note that the pressure contact member 9 also has a three-layer structure like the pressure contact member 8.

The developer 1 is then sent to the carrier 4 by the transport roll 3, and a thin layer of the developer 1 is formed on the carrier 4 by the rotation of the carrier 4 and the layer forming member 5. At this time, since pressure contact members 8.9 are provided at both ends of the layer forming member 5 in the longitudinal direction, both ends of the tip end of the layer forming member 5 are in contact with the carrier 4. The developer 1 is transferred to the carrier 4
scraped from the surface and returned to the hopper area.

Note that the hopper area includes the hopper 2 and the layer forming member 5.
It is made up of.

Therefore, according to the embodiment, since the developer 1 is scraped off the surface of the carrier 4 at both ends of the layer forming member 5 in the longitudinal direction, the developer 1 does not exist at both ends. Therefore, the developer 1 does not spill from both ends of the layer forming member 5 in the longitudinal direction, and therefore, it is possible to prevent the developer 1 from spilling from both ends of the carrier 4, resulting in a uniform developer layer. It becomes possible to form.

Next, FIG. 3 shows a non-magnetic one-component developing device according to another embodiment of the present invention.

In the embodiment shown in FIG. 3, both ends of the tip of the layer forming member 5 are cut out with a width of 10 mm, and the cutouts 5b, 5c
The cutout portion 5b.

The layer forming member 5 is attached so that the layer 5C contacts the surface of the carrier 4. Therefore, both ends of the tip end of the layer forming member 5 are in reliable contact with the carrier 4, and the carrier 4
The developer 1 at both ends is effectively scraped off from the surface of the carrier 4, and spilling of the developer 1 at both ends can be more effectively prevented. Note that at both ends of the layer forming member 5 in the longitudinal direction,
Although it is preferable to provide a pressure contact member (not shown in FIG. 3), the function of preventing the developer 1 from spilling can be sufficiently achieved even when the pressure contact member is not attached.

(Effects of the Invention) As explained above, according to the present invention, developer is prevented from spilling from both ends of the layer forming member in the longitudinal direction, and therefore developer is prevented from spilling from both ends of the carrier. This makes it possible to form a uniform developer layer.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a non-magnetic one-component developing device according to an embodiment of the present invention. FIG. 2 is a diagram showing the device of FIG. 1 viewed from the direction of arrow E. FIG. A diagram showing a non-magnetic one-component developing device according to an embodiment and showing the same state as FIG. 2, FIG. 4 is a schematic configuration diagram of a conventional non-magnetic one-component developing device, and FIG. 5 shows the device shown in FIG. 4 by arrow C. It is a figure which shows the state seen from the direction. 1...Developer, 2...Hopper, 3.
...Conveyor roll, 4...Supporting body, 5...
...Layer forming member, 5a...Tip portion, 5b,
5c...Notch, 6...Developer layer, 7
...Holder, 8,9...Press member,
8a...hair material, 8b...felt, 8
C: Holder for pressing.

Claims (2)

[Claims] (1) A developer is supplied to a carrier, a layer forming member forms a thin layer of the developer on the carrier, gives an electric charge, and sends this to a carrier that holds an electrostatic latent image. In a non-magnetic one-component developing device that develops a visible image by depositing a developer on an electrostatic latent image, the layer forming member extends in a doctor direction with respect to the carrier, and its tip portion touches the surface of the carrier. The layer forming member is arranged with a slight gap to the extent that they do not contact each other, and pressure contact members are provided at both longitudinal ends of the layer forming member for pressing both ends of the tip of the layer forming member against the carrier. Non-magnetic one-component developing device. (2) The layer-forming member has a notch formed at both ends of the tip thereof, and the layer-forming member is attached such that the notch contacts the surface of the carrier. Non-magnetic one-component developing device.