CN211293611U

CN211293611U - Magnetic core of developing roller

Info

Publication number: CN211293611U
Application number: CN201921969219.7U
Authority: CN
Inventors: 曹国柱
Original assignee: Zhongshan Chongtian Hardware Products Co ltd
Current assignee: Zhongshan Chongtian Hardware Products Co ltd
Priority date: 2019-09-29
Filing date: 2019-11-14
Publication date: 2020-08-18
Anticipated expiration: 2029-11-14

Abstract

The utility model discloses a developer roll magnetic core, including the magnetic core main part, the magnetic core main part is including the upper portion that has at least one magnetic pole and the lower part that has at least one magnetic pole and the intermediate part of connecting upper portion and lower part, upper portion has arc surface one, the lower part has arc surface two, the intermediate part has two and keeps away the face of vacancy, its characterized in that: and at least one protrusion part which is magnetized is arranged on the clearance surface. The area and the volume of the arc surface of the end part are increased through the protruding part, so that the magnetic force of the end part of the developing roller can be improved after magnetization, the magnetic carbon powder can be prevented from being driven by air flow to escape from a gap at the contact part of the sealing felt and the surface of the aluminum pipe, the powder leakage problem is avoided, the material only needs to be increased a little, the cost is controlled, and the cost advantage of the product is kept.

Description

Magnetic core of developing roller

The application requires that the Chinese patent office is filed on 2019-9-29, and the patent names are as follows: developing device

The roller magnetic core, patent number is: 201921652829.4.

Technical Field

The utility model relates to a laser printer, especially a laser printer's developer roll magnetic core.

Background

The magnetic roller in some jumping developing laser printer is usually composed of hollow aluminum tube and magnetic core set in the hollow aluminum tube, the magnetic core is fixed and the aluminum tube rotates, the magnetic core is cylindrical, the magnetic core is uniformly magnetized to form four magnetic poles, the polarity of the upper and lower magnetic poles is the same S pole, and the polarity of the left and right magnetic poles is the same N pole. In order to save cost and avoid the influence of a mold clamping line on a magnetic core, the magnetic pole of the magnetic core is simplified into two poles, the upper end and the lower end of the magnetic core are magnetized, arcs on two opposite sides of the magnetic core can be cut to form clearance gaps (for example, the technical scheme disclosed by the applicant in Chinese patent with the patent name of a double-pole magnetic core, the patent number is 201620688632.6), in actual practice, however, the above-described construction has been found to provide a magnetic core that, because the opposite sides of the core have been cut, the magnetic force on the two sides of the corresponding aluminum pipe is obviously greatly weakened, so that the adsorption force to the magnetic powder is also greatly reduced, when the stirring frame stirs the powder at a distance, the air is stirred, the air forms an air flow to drive the magnetic powder on the two sides to flow out from the gap at the contact position of the sealing felt and the surface of the aluminum pipe along the axial direction of the side surface, so that powder leakage is caused, and therefore improvement on the structure is needed.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model provides a developing roller magnetic core.

The utility model provides a technical scheme that its technical problem adopted is:

including the magnetic core main part, the magnetic core main part is including the upper portion that has at least one magnetic pole and the lower part that has at least one magnetic pole and the intermediate part of connecting upper portion and lower part, upper portion has arc surface one, the lower part has arc surface two, the intermediate part has two and keeps away the face, its characterized in that: and at least one protrusion part which is magnetized is arranged on the clearance surface.

The convex part is an arc-shaped part which is provided with a convex arc surface, and the convex arc surface is smoothly connected with the first arc surface or the second arc surface.

The convex cambered surface is a circular arc surface.

The convex arc surfaces are arc surfaces with the same radius as the first arc surface and the second arc surface.

The length of the convex cambered surface along the axial direction of the magnetic core main body is 5cm-15 cm.

And the space avoiding surface is provided with a material reducing groove.

Two keep away the sky face for the plane, parallel to each other and the symmetry sets up.

The utility model has the advantages that: the utility model discloses a be equipped with at least one bellying on keeping away the sky, we have increased the area and the volume of the arc surface of tip through the bellying to can improve the magnetic force of developer roll tip after magnetizing, thereby can avoid magnetism carbon powder to be driven by the air current and scurrying from the gap of sealed felt and aluminum pipe surface contact department, avoided the problem of leaking the powder, but the material only needs to increase a bit, therefore the cost is controlled, makes the product keep the cost advantage.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a front view of the present invention;

fig. 2 is a cross-sectional view of the magnetic core body end of the present invention;

FIG. 3 is a front view of another configuration of the present invention;

fig. 4 is a cross-sectional view of another configuration of a magnetic core body end of the present invention;

FIG. 5 is a front view of a formerly old structure;

FIG. 6 is a cross-sectional view of a previously used structure;

fig. 7 is a cross-sectional view of the evacuation surface being a curved surface.

Detailed Description

Referring to fig. 1 and 2, the utility model discloses a developer roll magnetic core, including magnetic core main part 1, magnetic core main part 1 includes an upper portion that has N utmost point magnetism and a lower part that has S utmost point magnetism and connects lower part and upper portion' S intermediate part, upper portion has arc surface one 2, the lower part has arc surface two 3, the intermediate part has two face 4 of keeping away, two in this application keep away the face 4 and preferably the cambered surface, so more economize the material, certainly also can be plane or V profile etc. two keep away the mutual symmetry setting of face, keep away and be equipped with at least one bellying on face 4, the bellying is the arc, and both sides of lower part and upper portion all have the arc in this application, and this arc has a protruding cambered surface 5, therefore arc surface one 2 meets with the protruding cambered surface 5 and the smoothness of both sides; and the second arc surface 3 is also smoothly connected with the convex arc surfaces 5 at the two sides, and the area and the volume of the arc surface at the end part are increased through the structure, so that the magnetic force at the end part of the developing roller can be improved after magnetization, the magnetic carbon powder can be prevented from being driven by air flow to jump out from a gap at the contact part of the sealing felt and the surface of the aluminum pipe, and the problem of powder leakage is avoided.

As shown in fig. 3 and 4, the left and right projections are integrally formed with the lower and upper portions to form a cylindrical body at the end of the core body 1, which is a limit structure in which the magnetic properties at both ends are the best and the most uniform, but certainly not the most material-saving.

As shown in the figure, the convex arc surfaces 5 are arc surfaces with the same radius as the first arc surface 2 and the second arc surface 3, so that the die is convenient to manufacture, the distance between the arc surfaces and the aluminum pipe is uniform, the magnetic field effect is good, and the convex arc surfaces 5 can also be arc surfaces of elliptical arcs or other function types.

As shown in the figure, the range of the central angle formed by the convex arc surface 5 and the first arc surface 2 or the second arc surface 3 is 30^o-170^o. The central angle a is preferably 120^oThe angle not only meets the requirement of the magnetic field size, but also saves materials; the lengths of the convex cambered surfaces 5 along the axial direction of the magnetic core main body 1 are equal, and the lengths are 5cm-15 cm; this length ensures the distance requirement of the required magnetic field.

As shown in the figure, the space avoiding surface is provided with the material reducing groove 6, materials can be saved more by arranging the material reducing groove 6 on the space avoiding surface, the material reducing groove 6 is easy to process, and the material reducing groove 6 can be a square groove, a round groove, a V-shaped groove and the like, and can even be an irregular groove.

The developing roller magnetic core provided by the embodiment of the present invention is described in detail above, and the principle and the implementation of the present invention are explained by applying specific examples herein, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. The utility model provides a developer roll magnetic core, includes the magnetic core main part, the magnetic core main part including the upper portion that has at least one magnetic pole and the lower part that has at least one magnetic pole and the intermediate part of connecting upper portion and lower part, upper portion has arc surface one, the lower part has arc surface two, the intermediate part has two and keeps away empty face, its characterized in that: and at least one protrusion part which is magnetized is arranged on the clearance surface.

2. The developing roller magnetic core according to claim 1, characterized in that: the convex part is an arc-shaped part which is provided with a convex arc surface, and the convex arc surface is smoothly connected with the first arc surface or the second arc surface.

3. The developing roller magnetic core according to claim 2, characterized in that: the convex cambered surface is a circular arc surface.

4. The developing roller magnetic core according to claim 3, characterized in that: the convex arc surfaces are arc surfaces with the same radius as the first arc surface and the second arc surface.

5. The developing roller magnetic core according to claim 2, characterized in that: the length of the convex cambered surface along the axial direction of the magnetic core main body is 5cm-15 cm.

6. The developing roller magnetic core according to claim 1, characterized in that: and the space avoiding surface is provided with a material reducing groove.

7. The developing roller magnetic core according to claim 1, characterized in that: two keep away the sky face and be the cambered surface, and two keep away the mutual symmetry setting of sky face.