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Browse Prior Art Database

MAGNETIC METHOD OF SIZING METAL SLEEVES

IP.com Disclosure Number: IPCOM000026742D
Original Publication Date: 1993-Jun-30
Included in the Prior Art Database: 2004-Apr-06
Document File: 4 page(s) / 239K

Publishing Venue

Xerox Disclosure Journal

Abstract

A method for sizing metal sleeves using a magnetic field is disclosed. The method comprises inserting a metal sleeve inside a die having a seamless inner surface, positioning an electrical current generating means inside the sleeve in the die, sealing the die after insertion of the sleeve and positioning of the current generating means, creating a vacuum inside the die, and generating a current with the current generating means to create a magnetic field which expands the sleeve against the inner surface of the die.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 45% of the total text.

Page 1 of 4

XEROX DISCLOSURE JOURNAL

41

MAGNETIC METHOD OF SIZING METAL SLEEVES US. C1.430/059 Abraham Cherian
William
G. Herbert

Proposed Classification

Int. C1. G03g 05/06

P

c

- 12

51

- 26

44

-

c 49

52

XEROX DISCLOSURE JOURNAL - Vol. 18, No. 3 May/June 1993 305

[This page contains 1 picture or other non-text object]

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MAGNETIC METHOD OF SIZING METAL SLEEVES (Cont'd)

A method for sizing metal sleeves using a magnetic field is disclosed. The method comprises inserting a metal sleeve inside a die having a seamless inner surface, positioning an electrical current generating means inside the sleeve in the die, sealing the die after insertion of the sleeve and positioning of the current generating means, creating a vacuum inside the die, and generating a current with the current generating means to create a magnetic field which expands the sleeve against the inner surface of the die.

The figure is a cross-sectional view of components used in the sizing method. The method may be used to precisely size sleeves composed of an electrically conductive material, such as aluminum and copper. The sleeves are generally useful as photoreceptor substrates for use in electrophotographic printers and copiers. Referring to the figure, a sleeve 10 is sized in a die 20 which controls the outer dimensions of the sleeve. The die is a cylindrical steel die having a seamless inner circumferential surface 22. The inner surface 22 of the die is formed to correspond to the desired finished dimensions of the sleeve to be sized. For photoreceptor applications, the steel die is generally cylindrical and the inner surface of the die is highly polished; however, the inner surface of the die may also be knurled or grooved depending on the intended application of the sleeve. The cylindrical die is opened at each of its ends 24 and 26. An end plate 28 sealingly closes end 24 with an O-ring seal 34. The end plate 28
includes a vacuum port 30 for coupling the inside of the die to a vacuum machine 32. The vacuum machine may be any known type which applies suction to remove air from the sealed die. The metal sleeve 10 is sized by a magnetic field generated by a magnetic coil 40 assembly. The magnetic coil assembly 40 includes a mandrel 41 having a flanged portion 44 and a generally cylindrical portion 42 having an embedded insulated copper wire 46. The cylindrical portion 42 of the mandrel 41 is formed so that it can be inserted inside the metal sleeve 10 without contacting the metal sleeve's inner surface
14. The flanged portion 44 of the mandrel 41 is formed to close end 26 of the die. An O-ring seal 34 is placed between end 26 of the die and the flanged portion 44 of the mandrel to complete the vacuum seal for the die. The magnetic coil 40 assembly is energized upon closure of a switch 48. In a typical application, the amount of energy which can be applied to the magnetic coil ranges from 0 to 80 kJ. When switch 49 is closed and switch 48 is open, a high voltage capac...