Cylindrical body for an image forming apparatus

• US 5,842,962 A
• Filed: 10/30/1995
• Issued: 12/01/1998
• Est. Priority Date: 10/31/1994
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Onuma, Suguru, Yamada, Yusuke, Endo, Saijiro, Tanaka, Shigemori
• Primary Examiner(s): Bryant, David P.
• Application Number:
  US08/550,375
• Time in Patent Office: 1,128 Days
• Field of Search: 492/18, 492/40, 492/45, 492/47, 399/159, 399/279, 399/286, 399/313, 29/895.22, 355/133
• US Class Current: 492/18
• CPC Class Codes: B23P 11/025 by using heat or cold
• CPC Class Codes: B24C 1/04 for treating only selected parts of a surface, e.g. for carving stone or glass
• CPC Class Codes: B25J 17/0208 Compliance devices
• CPC Class Codes: G03G 15/0928 relating to the shell, e.g. structure, composition
• CPC Class Codes: G03G 15/751 relating to drum G03G15/757 takes precedence
• CPC Class Codes: Y10T 29/49556 Work contacting surface element assembled to end support members

Abstract

It is an object of this invention to provide a cylindrical body manufacturing method capable of setting a high coaxiality and a high run-out accuracy between a cylindrical member and a flange member. To achieve this object, in a cylindrical body manufacturing method according to this invention, the diameter of an end portion of a sleeve is increased by heating the end portion. A flange held at the end of a robot hand is clearance-fitted in an inner-diameter processed hole in the end portion of the sleeve while the central axis of the flange is aligned with that of the sleeve. The flange is then pushed to make the outer periphery of the flange abut against the end face of the sleeve.

Claims

1. A cylindrical body for an image forming apparatus in which a shaft portion of a flange member is fitted into a hole having a machined diameter formed at an end portion of an aluminum cylindrical member,

wherein the diameter of the hole and the shaft portion are set to have a close-fit relation, where a connection margin of 0.04% to 0.2% of the diameter of the hole is obtained between the diameter of the hole and the shaft portion at room temperature, and a depth of the hole is set to have a longer dimension than the shaft portion,

wherein said flange member has an opposing surface which abuts against an end face of said cylindrical member, and

wherein the end portion of said cylindrical member is heated and the hole is increased in diameter by 0.3% to 0.5% so as to have a clearance-fit relation with the shaft portion of said flange member, the shaft portion is fitted in the hole, an the end portion of said cylindrical member is cooled, so that a central axis of said flange member is aligned with a central axis of said cylindrical member, and an opposing surface of said flange member contacts the end face of the end portion of said cylindrical member.

2. The cylindrical body according to claim 1, wherein main constituents of the end portion of said cylindrical member and the shaft portion of said flange member are the same.

3. A cylindrical body for an image forming apparatus comprising:

a sleeve member having an opening portion formed in at least one end thereof, and a shaft member receiving portion being defined inside the opening portion, said sleeve member being made from aluminum; and

a shaft member having a first cylindrical portion fitted into said shaft member receiving portion of said sleeve member, and a second cylindrical portion, which forms a shaft portion extending from the first cylindrical portion,

wherein the shaft member receiving portion and the first cylindrical portion are set to have a close-fit relation, where a connection margin between the first cylindrical portion and the shaft member receiving portion is 0.04% to 0.2% of the diameter of the shaft member receiving portion at room temperature, and a length of shaft member receiving portion is set to have a longer dimension than said first cylindrical portion, and

wherein the diameter of the shaft member receiving portion of said sleeve member is increased by 0.3% to 0.5% by heating the opening portion to a predetermined temperature by induction heating so as to have a clearance-fit relation with the first cylindrical portion, the first cylindrical portion of said shaft member is inserted and fitted in the shaft member receiving portion having been increased in diameter, and said shaft member and said sleeve member are connected by cooling the heated opening portion.

4. The cylindrical body according to claim 3, wherein a flange portion is formed on the first cylindrical portion of said shaft member so that an end face of the opening portion abuts against the flange portion when said shaft member is inserted into the shaft member receiving portion.

5. A cylindrical body for an image apparatus comprising:

a sleeve member having an opening portion formed in at least one end thereof, a shaft member receiving portion being defined inside the opening portion; and

a shaft member having a first cylindrical portion fitted in the shaft member receiving portion of said sleeve member, and a second cylindrical portion, which forms a shaft portion extending from the first cylindrical portion,

wherein said sleeve member and said shaft member are primarily made from aluminum,

the shaft member receiving portion and the first cylindrical portion are set to have a close-fit relation, where a connection margin between the first cylindrical portion and the shaft member receiving portion of 0.04% to 0.2% of the diameter of the shaft member receiving portion is obtained between the shaft member receiving portion and the first cylindrical portion at room temperature, and a length of the shaft member receiving portion is set to have a longer dimension than the first cylindrical portion, and

an inner diameter of the shaft member receiving portion of said sleeve member is increased by 0.3% to 0.5% by heating the opening portion to a predetermined temperature, the first cylindrical portion of said shaft member is inserted and fitted in the shaft member receiving portion having been increased in diameter, and said shaft member and said sleeve member are integrally connected by cooling the heated opening portion, thereby ensuring coaxiality between said sleeve member and said shaft member.