JPS5848904A - Preparation of rolled magnet - Google Patents

Abstract

PURPOSE:To obtain a rolled magnet which ensures simplified manufacturing process and shows excellent performance by squeezing a little in the axial direction the rolled magnet of which surface has a high magnetic flux. CONSTITUTION:The mixture of ferrite particle 1 and the medium 2 binding such particle 1 is formed into the sheet 4 through the rotating rolls 3 and thereby an anisotropic magnet material which shows ferro-magnetic property from longitudinal direction B to thickness direction A of the sheet 4 can be obtained. The sheet 4 is then laminated up to the specified thickness and the laminated sheet is given many cuttings such as wedges and is considered as the material consisting of plurality of coupled magnet material pieces 9 having the sector cross- section. Thereafter, it is wound around the external circumference of the shaft 10 and thereby a rolled magnet can be obtained. Then, this magnet is magnetized and both ends are respectively squeezed mutually in the reverse directions. Thereby, the rolled magnet 11 can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a roll-shaped magnet used for conveying magnetic toner in electronic copying machines and the like.

Conventional twisted rolled magnets have been obtained by press-molding ferrite powder, sintering it to form a rolled magnet, twisting the rolled magnet, and magnetizing it with a magnetizing yoke.

However, 1. In this method, it is necessary to provide spiral grooves or protrusions on the magnetizing yoke for magnetizing the magnetic poles, making processing and winding extremely difficult.

However, there are other conventional examples in which short magnet pieces for each magnetic pole are pasted in a spiral shape, but since each magnet piece is broken, it is difficult to achieve uniform magnetic toner transport operation. However, I was only able to obtain copies with poor image quality.
There was a problem in that it required time and effort to assemble.

The present invention aims to eliminate the above-mentioned conventional drawbacks, provide a method for manufacturing a rolled magnet that is easy to manufacture, requires simple manufacturing equipment, and has excellent characteristics. .

That is, in order to achieve the object of the present invention, the present invention sequentially changes the gradient of the magnetic orientation so that the magnetic orientation inside the magnet from magnetic pole to magnetic pole exhibits ferromagnetism effectively in the flow of magnetizing magnetic flux. It is characterized by being made into a roll-shaped magnet that can be stretched out.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 11.

First, as shown in FIG. 1, a mixture of scale-shaped ferrite particles 1 subjected to magnetic anisotropy treatment and a rubber or synthetic resin medium 2 for bonding the ferrite particles 1 is passed between rotating rolls 3 to form a sheet 4. , the ferrite particles 1 are oriented in the rolling direction of the sheet 4 to produce an anisotropic sheet-like magnet material that exhibits ferromagnetism in the thickness direction from the length direction B of the sheet 4, as shown in FIGS. 2a and 2b. obtain. The thickness of this sheet 4 is in the range of 0.5 to 3.0 IIi, and the magnetic orientation is uniform.
If it exceeds 3.0, it becomes incomplete.

Such sheets 4 are laminated to have an arbitrary thickness,
As shown in FIG. 3, a lower mold 6 having a plurality of wedge-shaped protrusions 5 at regular intervals and an upper mold 8 provided in the same number as the lower mold 85 are used to perform press processing as shown in FIG. A plurality of magnet material pieces 9 having a fan-shaped cross section are connected together, and as shown in FIG. 5, this is wound around the outer periphery of a shaft 10 to form a rolled magnet. Since the shaft 10 and the magnet material piece 9 are bonded with an adhesive, before the adhesive hardens, magnetization is performed as shown in FIG. is twisted in the opposite direction to obtain a twisted rolled magnet 11 as shown in FIG. Note that if surface finishing is required, cutting is performed after the adhesive has hardened.

Then, as shown in FIG. 8, a flange 1 is attached to the shaft 1o.
2. Attach 13 and cover with sleeve 14 to complete the product.

With this configuration, by rotating the rolled magnet 11 and fixing the sleeve 14 or rotating it in the opposite direction, the magnetic toner attracted onto the sleeve 14 by magnetic force can be moved while rotating on the circumference of the sleeve 140.

If the twisting direction of the rolled magnet 11 is clockwise, the magnetic toner will be rotated in the counterclockwise left spiral direction a' when the rolled magnet 11 is rotated clockwise a as shown in FIG. In the case of left rotation, it is conveyed in a counterclockwise left spiral direction b'.

Further, if the twisting direction is a left-handed twist, the right rotation causes the item to be conveyed in a clockwise left spiral direction, and the left rotation causes the item to be conveyed in a clockwise left spiral direction.

In addition, the twisted shape can also be made into a shape in which only the center is twisted, as shown in FIGS. 10 and 11.

As described above, the method of manufacturing a rolled magnet of the present invention has excellent productivity, and since magnetization is performed before twisting, the shape of the magnetizing yoke can be simple, and the twisting angle can be freely selected. Therefore, the magnetic toner can be moved in a spiral direction at a fast speed, and the rolled magnet prevents the same magnetic toner from remaining on the sleeve forever and prevents blocking. It has the advantage of being able to improve image quality while maintaining good fluidity and eliminating the need for scraping blades, making it an industrially valuable product.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the sheet manufacturing process in one embodiment of the method for manufacturing a rolled magnet of the present invention, and Figures 2a and b are magnetic characteristics diagrams in the thickness direction and length direction of the sheet obtained by the same method. , Fig. 3 is a sectional view of the press forming process of the laminated body of the same sheet, Fig. 4 is a sectional view of the same pressing process, Fig. 6 is a perspective view of the process of winding the processed product around the shaft, and Fig. 6 is a sectional view of the press forming process of the sheet laminate. A perspective view showing the twisting process after magnetization, Figure 7 is a perspective view after the twisting process, Figure 8 is a sectional view of the finished product, Figure 9 is an explanatory diagram of the same operating state, Figures 10 and 11. The figure shows a rolled macer of another embodiment.
FIG. 2 is a perspective view of a gunnet. 1... Ferrite particles, 2... Medium,
3...Roll, 4...Sheet, 6...
...Protrusion, 6...Lower mold, 7...
Depth of cut, 8... Upper mold, 9... Magnet material piece, 10... Shaft, 11...
...Rolled magnet. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure α b Figure 3 Figure 4 Figure 5 Figure 6 Figure 7! // Fig. 8 4 12 // 13 Fig. 9 Fig. 10 // /+ ' /I Fig. 10 Procedural amendment' written form) ■Indication of the case 1982! l, S Patent Application No. 148524 2 Komei's name Manufacturing method for roll magnets 3 was changed to Sanno and changed to C. 1. Old 1. - Patent applicant If: +1 10 Oaza Kadoma, Kadoma City, Osaka Prefecture
Address 06, "+4'l;, (082') Matsushita Electric Industrial Co., Ltd. □-Nia +It
Toshihiko Shimo 4 Agent 571 Shi +, +7 1006 Oaza Kadoma, Kadoma City, Osaka Prefecture Shimo' Ichiki Sangyo Co., Ltd.

Claims (1)

[Claims] A mixture of ferrite granules and a medium bonding the ferrite particles is passed between rotating rolls, and sheets in which the magnetically anisotropic turite particles in the medium are magnetically oriented in the rolling direction are laminated to a predetermined thickness. A large number of wedge-shaped cuts are made in the laminated material so that pieces of magnetic material with a fan-shaped cross section are connected at some parts, and after this is wound around a shaft and magnetized, a twist is added to this group of magnetic material pieces. A method of manufacturing a roll-shaped magnet characterized by forming magnetic poles in a spiral shape.