Apparatus for magnetizing a magnetic roller

• US 5,319,335 A
• Filed: 07/29/1992
• Issued: 06/07/1994
• Est. Priority Date: 07/29/1992
• Status: Expired due to Term

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Fang, Wen-Ling, Huang, Der-Ray
• Primary Examiner(s): Picard, Leo P.
• Assistant Examiner(s): BARRERA, RAMON M
• Application Number:
  US07/921,568
• Time in Patent Office: 678 Days
• Field of Search: 335/284, 335/296-298, 335/302-306, 118/657, 118/658, 355/251, 355/252, 355/253, 361/143
• US Class Current: 335/284
• CPC Class Codes: H01F 13/003 Methods and devices for magnetising permanent magnets permanent magnets H01F7/02
• CPC Class Codes: H01F 7/0268 Magnetic cylinders

Abstract

A magnetizing apparatus capable of magnetizing a magnetic roller having a length up to 30 cm is provided. The magnetizing apparatus is comprised of at least two split members, each of which is provided with magnetic heads employed for applying magnetic fields to a magnetic roller. The end face of each magnetic head is shaped in agreement with the profile of the magnetic roller so that there would be no air gap formed between the magnetic head and the magnetic roller when they come into contact with each other. The split members are separated first and then combined to accommodate the magnetic roller within the magnetizing apparatus. After magnetization, a magnetic force is induced between the magnetic head and the magnetic roller such that an external force stronger than the magnetic force is used to pull the split members apart to fetch out the magnetic roller.

Claims

1. An apparatus for magnetizing a magnetic roller having multiple magnetic poles, said apparatus comprising:

(a) at least two split members;

(b) engaging means capable of combining said split members together;

(c) a predetermined number of magnetic heads arranged with predetermined orientations within said split members for magnetizing the magnetic roller, each of said magnetic heads having an end face shaped in accordance with the profile of the magnetic roller so that each of said magnetic heads comes into tight contact with the magnetic roller when said split members are combined to attach said magnetic heads to the magnetic roller, the magnetic heads being disposed around the magnetic roller at a tilted angle;

wherein as magnetization of the magnetic roller is completed said engaging means is capable of separating said split members from the magnetic roller.

2. An apparatus according to claim 1, wherein any of said magnetic heads are tapered so as to produce a magnetic pole having a converged magnetic flux.

3. An apparatus according to claim 1, wherein said engaging means includes a pair of push-pull bars used to push and pull the split members toward or away from the magnetic roller.

4. An apparatus according to claim 1, wherein said engaging means includes:

at least one hinge provided at one side of each of said two split members, and

means, provided at the other side of each of said two split members, for fastening said two split members.

5. An apparatus according to claim 1 wherein the end face of any of said magnetic heads are symmetric.

6. An apparatus according to claim 1 wherein the end face of any of said magnetic heads are asymmetric.