JPS6232295Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a magnet roll for developing an electrostatic latent image with a magnetic brush, and relates to the joint shape of a sleeve and a flange member.

Magnet rolls for electrostatic development generally consist of a magnet structure, a shaft, a sleeve, and a flange member. The sleeve is made of a cylindrical non-magnetic material, and the magnet component is inserted into the sleeve together with the shaft so that it can rotate freely relative to the sleeve. It is very common to fix the inner circumferential surface of the sleeve end and the circumferential outer surface of the flange member with an adhesive.

This adhesive bond differs depending on the type of material, but the blending ratio of the adhesive, mixing ratio, pot life, change over time, etc. affect the bond strength, and these must be strictly controlled. Nowadays, high-speed development is strongly desired in, for example, electrophotography, and it is particularly desired that the bonding strength between the sleeve and the flange member be strong and stable. Furthermore, the effects of adhesives on people, such as odor and rough skin, cannot be overlooked during manufacturing.

In order to solve these problems, this invention proposes a coupling shape that uses mechanical coupling for coupling the sleeve and flange member and provides excellent fixing strength.

In other words, this invention is based on the idea that when a sleeve of a magnet roll for electrostatic development is constructed in a non-magnetic material sleeve so as to be relatively rotatable, and a flange member is connected, a magnet member is provided on the periphery of the outer surface of the flange member. Electrostatic development having a shape consisting of an annular groove, a slit portion cut out from the annular groove to the circumferential edge of the flange member, and a curled portion of the end of the sleeve wound from the circumferential edge of the flange member along the edge of the annular groove. The main topic is Magnetrol.

This invention will be explained in detail below based on the drawings. FIGS. 1 and 2 are longitudinal sectional views showing the combined shape of the sleeve and the flange member.

The magnet roll for electrostatic development consists of a cylindrical sleeve 1 made of a non-magnetic material and a magnet structure (not shown) configured to freely rotate in opposition to the sleeve 1, and to apply rotational force to the sleeve 1. The circumferential surface of the flange 2, which is integrated with the shaft (not shown), is fixed to the inner circumferential surface of both ends of the sleeve 1.

An annular groove 3 is formed concentrically around the outer surface of the flange 2.
The shoulder end surface of the flange 2 from the circumferential surface of the flange 2 to the edge of the annular groove 3, and the circumferential edge of the flange 2 extending from the edge of the annular groove 3 to the groove bottom, for example, have a cross section shaped like an arc. This flange 2 is fitted into the end of the sleeve 1, and the end of the sleeve 1 is machined with a hydraulic device using, for example, a jig.
When the sleeve 1 and the flange 2 are wound along the peripheral edge of the flange 2, which has an arcuate cross section, the sleeve 1 and the flange 2 are fitted together at the curled portion 4 of the sleeve 1, and a strong bonding force is obtained so that they will not separate. . Moreover, this bonding strength is stable and does not change over time unlike adhesives.

Furthermore, since the slit portion 5 is formed in a part of the annular groove 3 by cutting out the peripheral edge of the flange from the groove edge, the end of the sleeve 1 is curled and can be cut along the peripheral edge of the flange 2. Since the end of the sleeve 1 located within the slit portion 5 has no partner to wrap around in the slit portion 5 during winding, the end portion of the sleeve 1 forms a smaller curl and enters the slit portion 5.

The rotational torque from the shaft can be sufficiently transmitted to the sleeve only by the engagement between the curl at the end of the sleeve 1 and the annular groove 3 of the flange 2. The curled portion 4 at the end of the sleeve 1, which is narrowed slightly into the slit portion 5, can prevent rotation in the rotational direction.

The above-mentioned slit portion 5 may have any configuration as long as it is cut out to the circumferential end of the flange member and the end portion of the sleeve 1 is slightly narrowed into the same portion.

Furthermore, in addition to making the peripheral end of the flange 2 arcuate as described above, various other shapes may be used.

Further, a thin groove 6 is further provided around the bottom of the annular groove 3 provided in the flange 2, and this flange 2 is fitted into the end of the sleeve 1, and the end of the sleeve 1 is formed into the curled part 4 as described above, and the flange 2, and the tip of the curled portion 4 is immersed or press-fitted into the narrow groove 6, thereby reinforcing the rotational direction of the sleeve 1 in addition to the shape of the connection with the flange 2 by the curled portion 4 of the sleeve 1. Shapes can be combined.

Above is the sleeve 1 and flange 2 according to this invention.
As explained above, even if it is a mechanical bond, its fixing strength is strong and stable, so it not only solves the above problems, but also provides a constant and strong bond to the product during manufacturing. It has the advantage of improving quality stability and productivity, and improving the working environment because no adhesive is used.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional views showing the combined shape of the sleeve and flange member. In the figure, 1...sleeve, 2...flange, 3...
...Annular groove, 4...Curl part, 5...Slit part,
6...Narrow groove.

Claims (1)

[Scope of utility model registration request] In coupling a flange member to a sleeve of a magnet roll for electrostatic development in which a magnet member is configured to be relatively rotatable within a non-magnetic sleeve, an annular groove provided on the periphery of the outer surface of the flange member; A magnet roll for electrostatic development having a shape consisting of a slit section cut out from the annular groove to the circumferential edge of the flange member, and a curled section at the end of the sleeve wound from the circumferential edge of the flange member along the edge of the annular groove.