|Publication number||US3695757 A|
|Publication date||Oct 3, 1972|
|Filing date||Feb 13, 1970|
|Priority date||Feb 27, 1969|
|Also published as||DE2008627A1|
|Publication number||US 3695757 A, US 3695757A, US-A-3695757, US3695757 A, US3695757A|
|Inventors||Paul M Gregory|
|Original Assignee||Xerox Corp|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (5), Referenced by (20), Classifications (14)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent Gregory 1 1 XEROGRAPHIC PLATE  Inventor: Paul M. Gregory, Cheltenham, En-
gland  Assignee: Xerox Corporation, Rochester, NY.  Filed: Feb. 13, 1970 ] Appl. No.: 11,160
 US. Cl. ........................355/3, 101/378, 269/22, 294/63 A  Int. Cl. ..G03g 15/00  Field of Search ..3$S/3, 16, 85, 87, 92; 279/1 D; 269/22; 101/375, 378; 294/93, 99, 63 A  References Cited UNITED STATES PATENTS 2,987,994 6/ 1961 Allison ml/Q76 45] Oct. 3, 1972 3,253,854 5/1966 Hollander, Jr. ..269/22 X 3,379,527 4/1968 Corrsin et a]. ..355/17 X 4 3,166,335 1/1965 Mason .294/93 X FOREIGN PATENTS OR APPLICATIONS 109,212 9/1917 GreatBritain Primary Examiner-Samuel S. Matthews Assistant Examiner-Richard M. Sheer Attorney-James J. Ralabate, Norman E. Schrader and Michael J. Colitz, Jr.
[ ABSTRACT A xerographic plate including a mandrel and a photooonductive sleeve mounted thereon. The mandrel has an inflatable tube mounted in a groove for securing the sleeve to the mandrel.
PATENTEDUCI a 1972 3. 695. 757
INVENTOR. PAUL M. GREGORY BY 5n.
ATTORNEY XEROGRAPI-IIC PLATE This invention relates to a cylindrical support for a sleeve. One particular application is a cylindrical support for a sleeve having an outer surface of photoconductive material.
In xerographic copying machines, the xerographic plate is often in the form of a drum. The drum has a rigid cylindrical body mounted on an axial shaft, and a photoconductive insulating layer is overcoated on the base. The layer has a conductive base, which may be provided by the drum body. This photoconductive layer is liable to damage and ageing effects, and the recoating of such drums is troublesome.
It has been proposed to form the photoconductive layer on a flexible sleeve and to mount the sleeve on a separate cylindrical mandrel which can be contracted so that the sleeve can easily be fitted on the mandrel and then expanded to hold the sleeve in an accurately cylindrical shape. Such a mandrel has been proposed using a hollow cylinder with a slot extending parallel to the axis and a cam operated linkage for opening and closing the slot. Such a cylinder has proved difficult to manufacture, and the present invention can be used to provide an alternative support for such a sleeve.
According to the invention there is provided a cylindrical support for a sleeve, wherein the periphery of the support can be altered from a contracted state to an expanded state, the support comprising a rigid cylinder whose outer surface is formed with at least one groove extending in a generally circumferential direction, and a hollow body whose shape depends on the difference of its internal and external pressure lying in the trough of the groove, the body being movable by change of in ternal pressure between a first state in which the body lies within the outer surface of the cylinder and a second state in which the body extends beyond the periphery of the rigid cylinder to expand the periphery of the support foundation for a sleeve on the cylinder.
An example of the invention will be described with references to the drawings in which FIG. 1 is a perspective view of a sleeve and a cylindrical support with its inflatable body removed.
FIG. 2 is an end view showing the clamped end of a tube.
FIG. 3 is a view of the opposite end to FIG. 2, showing a valve at the other end of the tube.
FIG. 4 is a sectional view through line 4-4 of FIG. 3 and FIG. 5 is a sectional view similar to that of FIG. 4 but showing a modified groove and tube.
In the drawings, the outer surface of a hollow metal cylinder or mandrel l l is fomied with a circular groove 12 which is five-sixteenths inches wide and three-sixteenths inches deep at each end, with a helical groove I3 running between the end grooves with a pitch of five-sixteenths inches and being three-sixteenths inches deep. Within the helical groove a rubber tube 21 is carried, shown in FIG. 4 but not shown in FIG. I. As shown in FIG. 4, the tube 21, when in a non-inflated condition, is substantially enclosed within the trough of the grooves provided so that the outer periphery of the tube is supported below the outer surface of the cylinder 11. On each end of the helical groove the tube passes through a hole in the cylindrical shell to the interior of the cylinder. One end of the tube is closed by clamp 19 on cylinder 11 (see FIG. 2) and the other end is connected to a valve, 14, seen in FIG. 3.
At each end of the cylinder. there is provided an internal flange 15 from which extend three spokes 16, supporting an axial bearing 17, so that the drum may be mounted on a shaft for rotation about its axis.
A flexible cylindrical sleeve 18 including a photoconductive insulating layer coated on a conducting layer is to be mounted on the drum. In the FIG. I embodiment, the rubber tube normally does not protrude beyond the top of the groove, so that when the sleeve is made with an internal diameter slightly greater than the external diameter of the drum, the sleeve can easily be slipped over the drum. The difference in diameter of the cylindrical shell and the inside of the sleeve is about 0.004 inches. The sleeve is held in its required position on the drum, and air is introduced through the valve 14 into the tube so that the tube expands to extend above the periphery of the drum and to exert pressure on the inside of the sleeve to hold it in an accurate cylindrical shape on the drum to constitute the xerographic plate. When the sleeve is to be removed, the air is released from the valve to deflate the tube.
In order to permit the photoconductive properties of the sleeve 18 to be effective during xerographic operations as described in US. Pat. No. 3,30l .126 to Osborne et al., the sleeve is grounded. This is achieved through a conductive member 20 such as a metal grounding wire bolted, clipped or otherwise secured between the conductive layer of the sleeve and the metal cylinder 11. The cylinder is grounded through its supporting shaft in the conventional fashion.
In an alternative embodiment, the tube normally extends above the cylindrical surface of the drum, but can be contracted into the tube by reduction of the pressure within the tube. In this case, the valve 14 normally acts to allow air out of the tube, the valve is connected to a source of reduced pressure in order to reduce the size of the tube to allow the sleeve to be placed in position and removed, and air is allowed back into the tube at normal atmospheric pressure to secure the sleeve on the drum.
A pressure differential of a few pounds per square inch is believed to be sufficient to change the shape of the tubes to secure and release the sleeve. A length of tube of feet could be used on a 9 inch diameter drum.
As shown in FIG. 5, the circular grooves 22 and the helical groove 23 could be rectangular in cross-section and the tube 24 could be rectangular. In such case it would be desirable to make the tube with thicker walls 25 at its bottom and sides than at the top 26 where it must expand to effect the holding of the sleeve.
A pump may be provided within the drum to force air into or out of the tube in accordance with any of the embodiments described above.
In some applications, a plurality of tubes could be mounted in grooves in the cylinder. The tubes could be connected together to receive the same pressure or different pressures could be applied to different tubes to achieve a desired expansion pattern. Inflatable pads in suitably shaped recesses may also be used.
While the instant invention has been described herein with reference to the structures disclosed, it is not intended to be so limited and this application is in- 3 4 tended to cover such modifications or changes as may to freely move said mandrel, come within the scope of the appended claimsmeans to inflate said inflatable member to expand hat is C m is; said member into contact against the sidewalls of l. A xerographic drum suitable for use in an autothe groove and to expand a portion of said i fl matic xemgraphic reproducing apparatusincluding 5 ble member beyond the outer diameter of said a flexible cylindrical sleeve formed of an electrically conductive substrate having a layer of photoconductive materlal f i a flexible conductive member for electrically cona support mandrel having an outside diameter that is fleeting the substrate of said sleeve to said mam slightly less than the inside diameter of the flexible dreL cylinder whereby said support mandrel is capable of supporting said cylinder in free sliding relation- F surface manfirel said inflatable member comprises aflexible tube. having a continuous generally circumferentially extending helical groove formed therein The apparatus of (ilaim l h i said groove is a sin e inflatable member sitioned vmhin said rectangular in cross section and said Inflatable member groive said member beingpglbstamiauy endosed is rectangular in cross section and the wall of said tube within said groove with the outer periphery of said adjacent the penpheral. s,urface of Sam W member being below the outer surface of said thinner than the remaining walls of said flexible mandrel when said member is in a non-inflated member' condition to allow said flexible cylindrical sleeve mandrel into holding contact against said sleeve, and
2. The apparatus of claim I wherein said helical groove is generally semi-circular in cross section and
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|US3166335 *||May 6, 1963||Jan 19, 1965||Armstrong Cork Co||Expanding mandrel assembly|
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|Citing Patent||Filing date||Publication date||Applicant||Title|
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|U.S. Classification||399/159, 399/164, 294/119.3, 269/22, 101/378|
|International Classification||G03G15/00, G03G5/10, B65D39/08|
|Cooperative Classification||B65D39/08, G03G15/751, G03G5/10|
|European Classification||G03G15/75B, B65D39/08, G03G5/10|