US3631423A - Self-purging disk system - Google Patents

Self-purging disk system Download PDF

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Publication number
US3631423A
US3631423A US832930A US3631423DA US3631423A US 3631423 A US3631423 A US 3631423A US 832930 A US832930 A US 832930A US 3631423D A US3631423D A US 3631423DA US 3631423 A US3631423 A US 3631423A
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US
United States
Prior art keywords
disk
housing
fluid
filter
magnetic disk
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US832930A
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English (en)
Inventor
Robert George Groom
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unisys Corp
Original Assignee
Burroughs Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application granted granted Critical
Publication of US3631423A publication Critical patent/US3631423A/en
Assigned to BURROUGHS CORPORATION reassignment BURROUGHS CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). DELAWARE EFFECTIVE MAY 30, 1982. Assignors: BURROUGHS CORPORATION A CORP OF MI (MERGED INTO), BURROUGHS DELAWARE INCORPORATED A DE CORP. (CHANGED TO)
Assigned to UNISYS CORPORATION reassignment UNISYS CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: BURROUGHS CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/50—Reconditioning of record carriers; Cleaning of record carriers ; Carrying-off electrostatic charges
    • G11B23/505—Reconditioning of record carriers; Cleaning of record carriers ; Carrying-off electrostatic charges of disk carriers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/29—Air curtains

Definitions

  • a magnetic disk file memory is housed in a closed system and is generally assembled in a clean room to exclude foreign particles from the'interior of the housing to the greatest possible extent, because even a small number of particles may be damaging.
  • the information is stored on the magnetic surface of the large disk which is rotatable in the housing and access to the magnetic surface is by way of magnetic transducers making up the read ing and writing head of the system in which the disk memory is employed.
  • the magnetic transducers are necessarily positioned extremely close to the surface of the disk for most efficient magnetic coupling between the magnetic surface and the transducers.
  • the transducers are only 60 microinches from the surface of the disk. Because of the close proximity of the transducers to the surface of the disk any foreign particles that are in the housing that find their way to the area between the transducers and the surface of the disk may destroy the operability of the system or at least substantially impair the reliability of the system.
  • This invention involves a self-purging system or a system for removing particles over a selected size from the interior of an enclosure for a rotating mass wherein areas of different static pressure of the fluid enclosed in the enclosure are developed as the mass rotates, with a first area having a first static pressure and a second area having a second static pressure less than the first static pressure by an amount sufficient to carry the particles in the fluid from the first area to the second area through an external conduit, which external conduit includes a filter for collecting particles over a selected size.
  • the combination is simple and relatively inexpensive for the benefits that may result from the removal of particles of foreign matter by use of pressure developed by the closed system itself.
  • the system is particularly useful in the self-purging of or the removing of particles over a selected size from the housing for a rotatable magnetic disk memory.
  • the filter may advantageously collect all particles over microinches, for example.
  • FIG. 1 is a front elevation view, partially broken away, of a closed system having a circular enclosure housing a circular rotating mass which has a self-purging system in accordance with the present invention
  • FIG. 2 is a cross-sectional view of the closed system of FIG. 1, taken along section line 22 therein;
  • FIG. 3 is a front elevation view of a closed mechanical system having a rotating magnetic disk memory and incor porating a self-purging system in accordance with the present invention
  • FIG. 4 is a cross-sectional view of the magnetic disk memory system of FIG. 3, taken along the section line 4-4 therein;
  • FIG. 5 is a chart showing the static pressure distribution at a selected distance from the rotating magnetic disk at selected points in the rectangular cover of the enclosure of the system of FIG. 3.
  • FIG. 1 there is shown a disk-shaped mass 1 that isrotatable in a housing 2 of a circular configuration and which completely encloses the mass 1 to form a closed system. It is assumed that the closed system of FIG. 1 was assembled in a clean room in an attempt to eliminate foreign particles from the interior of the housing 2. However, in practice, it is found that particles of foreign matter find their way into the interior of the housing even though the system was assembled in a clean room and these particles may cause failure of the closed system. Thus, it is desirable to remove any foreign particles that remain in the housing 2 after assembly.
  • the rotating mass 1 which is disk-shaped acts like a pump with a constant flow of fluid contained in the housing coming off the periphery of the disk.
  • the rotating mass 1 which is disk-shaped acts like a pump with a constant flow of fluid contained in the housing coming off the periphery of the disk.
  • An outlet port 3 is provided in the end wall 4 of the housing 2 adjacent to the high-pressure area near the outer periphery of the rotatable mass 1.
  • An inlet port 5 is provided in the same end wall 4 adjacent the low-pressure area near the center of axis of rotation of the rotating mass 1.
  • the inlet port may be located in the other end wall 8 of the housing 2 adjacent a low-pressure area in the housing.
  • the outlet port 3 and inlet port 5 are connected externally through a conduit 6 in which a filter 7 is located.
  • the filter 7 is an absolute filter and collects all particles over a selected size.
  • the rotating mass creates a high-pressure area near the outlet port 3, which is sufficiently different from the low-pressure area near the inlet port 5, that fluid, which may contain particles of foreign matter, will flow through the external conduit 6 and through filter 7 therein.
  • the particles that are carried by the fluid will be trapped and retained by the filter 7 thereby effectuating a self-purging system for the closed system of FIGS. 1 and 2.
  • the self-purging system of the present invention was found to work very effectively on a closed magnetic disk file system for the removal of foreign particles that remained in the enclosure or housing for the system after assembly.
  • the particular system on which the self-purging system was employed is representatively shown in FIGS. 3 and 4.
  • the closed magnetic disk file system of FIGS. 3 and 4 includes a rotatable magnetic disk 10 supported by a shaft II joumaled in bearings 12 and 13, which are schematically shown in FIG. 4.
  • a housing 14 surrounds and encloses the disk 10.
  • Such magnetic disk memory systems are generally assembled in a clean room in an attempt to eliminate all particles of foreign matter from the interior of the housing 14. However, foreign matter may be left in the housing 14 when it is assembled around the magnetic disk file I0.
  • particles of foreign matter in addition to those that may have been left in the housing at the time of assembly, may be generated during operation of the magnetic disk file system by possible chemical reactions, or possibly erosion of some type. It is desirable to remove the particles initially present in the system and any that may be generated while the system is in operation.
  • the self-purging system of the present invention which does not require any external source of power, is advantageously adaptable.
  • the self-purging system will be in operation whenever the disk file system is in operation.
  • a self-purging system in accordance with the present invention is employed.
  • end walls 15 and 16 that are tangential to the axis of rotation of the magnetic disk 10, have two sections of differing configurations.
  • end wall 15 has a rectangular sec-' tion 17 and an arcuate section 18 that is a chord of a circle having its center at the center of the axis of rotation of the disk 10.
  • the rectangular section 17 covers the majority of the face of the magnetic disk 10 and supports the journal bearings 12 and 13 for the shaft 11 about which the magnetic disk 10 rotates.
  • the axis of rotation is represented by the cross 20 in FIG. 3.
  • Magnetic transducer block 21 is mounted on section 18 and magnetic transducer block 22 is mounted on arcuate section 23 of wall 16, to provide a balanced system.
  • the magnetic transducers in one illustrative example are positioned only 60 microinches from the face of the disk, which rotates at a relatively high speed of 1,750 revolutions per minute.
  • the information is stored as individual bits in extremely close proximity and in very small spaces on the disk so that any particles of foreign matter that scratch the disk or lodge between a magnetic transducer and the disk may destroy some information, impede the accurate coupling or otherwise impair the desired high quality of the system.
  • the distance between the arcuate sections 18 and 23 is different from the distance between the rectangular sections 16 and 17.
  • the arcuate section 18 has a flange 24 for mating with a flange 25 on the rectangular section 17 for joining the two sections to form the end wall 15.
  • the rectangular section 17 may be made seperable from the remainder of the housing 14, or the housing may be separable in some other manner, to provide for insertion of the disk 10 in the housing 14.
  • the outlet port may be positioned in the sidewall rather than in an end wall. Additionally, the port may be designed to collect substantially all of the fluid at the periphery of the rotating mass. The outlet port may then be coupled through one or more filters to one or more inlet ports located on one or both sides of the rotating mass. Altematively, there may be two or more systems of the type shown in the drawing employed with a closed system with one or more selfpurging systems on each side of the rotating mass.
  • a system for removing particles over a selected size from ambient fluid surrounding a magnetic disk which comprises:
  • a housing for enclosing a magnetic disk and the ambient fluid having end walls spaced apart from opposite faces of the disk and substantially parallel to the disk and having an outlet port and an inlet port in the end walls, the outlet port and the inlet port being located at said first and second areas respectively adjacent to the disk and between which areas the developed static pressure diflerential is sufficient to move ambient fluid through an external conduit with a filter;
  • a system for removing particles over a selected size from fluid surrounding a magnetic disk which comprises:
  • a housing for enclosing the magnetic disk and the fluid
  • housing having an interior surface portion in an area adjacent the periphery of the disk and against which fluid impinges when the disk rotates, said interior surface portion communicating with the disk to provide a narrowing transition in the cross-sectional area in the direction through which the fluid flows thereby developing in the impinging fluid a static pressure head, an outlet port adjacent said portion for fluid flowing out of the housing, and an inlet port in an area adjacent the central portion of the disk for fluid flowing back into the housing;
  • the housing comprises an end wall having a section spaced apart from and substantially parallel to a surface of the disk in said area adjacent the periphery of the disk and wherein the outlet port is and the edge of the rectangular section 17 and that the area 27 located in the end wall in the area adjacent to said interior surof lowest pressure is also near the flange 25 and on the opposite side of the axis of rotation 20.
  • an outlet port 30 is located on rectangular section 17 adjacent the area 26 of high pressure face portion.
  • a system for removing particles over a selected size from and an inlet port 31 is located on rectangular section 17 adfluid surrounding a magnetic disk, which comprises:
  • a tube 32 connects the outlet port 30 to the inlet port 31, with an absolute filter 33 positioned between the ports.
  • the difference in static pressure developed by the rotating disk 10 of FIGS. 3 and 4 is approximately 1.23 inches of water which is sufficient to carry particles in the fluid through the tube 32 and into the filter 33 for the collection of particles therein.
  • the filter 33 was an absolute filter that collected all particles over 20 microinches or approximately one-half micron in size and it was found that after a rotatable magnetic disk;
  • a housing for enclosing the magnetic disk and the fluid which flows when the disk is rotated, the housing having an end wall comprising a first section spaced a first distancefrom a surface of the disk, a second section spaced a second, closer distance from the same surface, and a joining part closing the two sections, the joining part at least partially spanning a chord between edges of the disk, the end wall communicating with the surface of the disk to provide a narrowing transition in the cross-secjacent the opposite side of the chord for fluid flowing back into the housing; a filter for collecting particles over a selected size; and

Landscapes

  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Soft Magnetic Materials (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • General Details Of Gearings (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Cleaning Or Drying Semiconductors (AREA)
US832930A 1969-06-13 1969-06-13 Self-purging disk system Expired - Lifetime US3631423A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US83293069A 1969-06-13 1969-06-13

Publications (1)

Publication Number Publication Date
US3631423A true US3631423A (en) 1971-12-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
US832930A Expired - Lifetime US3631423A (en) 1969-06-13 1969-06-13 Self-purging disk system

Country Status (6)

Country Link
US (1) US3631423A (enrdf_load_stackoverflow)
JP (1) JPS4926123B1 (enrdf_load_stackoverflow)
BE (1) BE751639A (enrdf_load_stackoverflow)
CA (1) CA925442A (enrdf_load_stackoverflow)
FR (1) FR2052505A5 (enrdf_load_stackoverflow)
GB (1) GB1258539A (enrdf_load_stackoverflow)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710540A (en) * 1970-11-25 1973-01-16 Burroughs Corp Self-purging disk system having air flow guide means
US3731291A (en) * 1971-04-12 1973-05-01 Burroughs Corp Integrated positive pressure and self-purge system
US3800325A (en) * 1972-08-14 1974-03-26 Callus Memories Inc Disc drive for memory disc cartridge
US3855624A (en) * 1973-08-15 1974-12-17 Philips Corp Grooved air bearing head
US4054931A (en) * 1975-04-02 1977-10-18 International Business Machines Corporation Gas filtering arrangement for magnetic disk information storage apparatus
US4112471A (en) * 1976-03-02 1978-09-05 Burroughs Corporation Disk cartridge contamination shield
US4199329A (en) * 1978-11-20 1980-04-22 Northrop Corporation Process and apparatus for the removal of vaporized contaminants from closed gas system
EP0020933A1 (en) * 1979-06-29 1981-01-07 International Business Machines Corporation Control of relative humidity in disk files
EP0022905A1 (en) * 1979-07-16 1981-01-28 International Business Machines Corporation Enclosed self-purging disk pack units
US4250528A (en) * 1978-04-18 1981-02-10 Mitsubishi Denki Kabushiki Kaisha Magnetic disc recording apparatus
US4581668A (en) * 1978-05-16 1986-04-08 Burroughs Corp. Disk contour cover having air filtration section
US4587645A (en) * 1984-05-07 1986-05-06 Miniscribe Corporation Disc drive assembly
US4725904A (en) * 1981-10-05 1988-02-16 Tandon Corporation Magnetic disk memory apparatus with improved contamination control
EP0246625A3 (en) * 1986-05-19 1989-06-07 Fuji Photo Film Co., Ltd. Method of and apparatus for cleaning magnetic recording disk cartridge
US5162053A (en) * 1987-09-24 1992-11-10 Kowalski Jr Walter J Vehicular brake material collection system
US5346518A (en) * 1993-03-23 1994-09-13 International Business Machines Corporation Vapor drain system
US5539595A (en) * 1993-03-02 1996-07-23 International Business Machines Corporation Structure and enclosure assembly for a disk drive
US6594108B2 (en) * 2001-06-28 2003-07-15 Seagate Technology Llc Disc drive with converging filter inlet for faster cleanup times

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624624A (en) * 1969-07-24 1971-11-30 Sperry Rand Corp Magnetic drum air filtration and purging system
CN115072325B (zh) * 2022-06-12 2023-03-14 安徽协同轴承股份有限公司 一种具有自吸式节能排油脂功能的轴承上下料装置及方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950353A (en) * 1955-07-05 1960-08-23 Litton Industries Inc Pliant disk magnetic recording apparatus
US3110889A (en) * 1960-05-02 1963-11-12 Lab For Electronics Inc Magnetic disc storage device
US3179945A (en) * 1961-03-21 1965-04-20 Lab For Electronics Inc Magnetic disc storage device
US3303485A (en) * 1963-03-18 1967-02-07 Ampex Magnetic disc with air bearing which spirals radially outward
US3319236A (en) * 1962-05-19 1967-05-09 Olympia Werke Ag Fluid bearing magnetic recording drum
US3381285A (en) * 1965-03-17 1968-04-30 Gen Precision Systems Inc Serrated record disc with internally generated air pressure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950353A (en) * 1955-07-05 1960-08-23 Litton Industries Inc Pliant disk magnetic recording apparatus
US3110889A (en) * 1960-05-02 1963-11-12 Lab For Electronics Inc Magnetic disc storage device
US3179945A (en) * 1961-03-21 1965-04-20 Lab For Electronics Inc Magnetic disc storage device
US3319236A (en) * 1962-05-19 1967-05-09 Olympia Werke Ag Fluid bearing magnetic recording drum
US3303485A (en) * 1963-03-18 1967-02-07 Ampex Magnetic disc with air bearing which spirals radially outward
US3381285A (en) * 1965-03-17 1968-04-30 Gen Precision Systems Inc Serrated record disc with internally generated air pressure

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710540A (en) * 1970-11-25 1973-01-16 Burroughs Corp Self-purging disk system having air flow guide means
US3731291A (en) * 1971-04-12 1973-05-01 Burroughs Corp Integrated positive pressure and self-purge system
US3800325A (en) * 1972-08-14 1974-03-26 Callus Memories Inc Disc drive for memory disc cartridge
US3855624A (en) * 1973-08-15 1974-12-17 Philips Corp Grooved air bearing head
US4054931A (en) * 1975-04-02 1977-10-18 International Business Machines Corporation Gas filtering arrangement for magnetic disk information storage apparatus
US4112471A (en) * 1976-03-02 1978-09-05 Burroughs Corporation Disk cartridge contamination shield
US4250528A (en) * 1978-04-18 1981-02-10 Mitsubishi Denki Kabushiki Kaisha Magnetic disc recording apparatus
US4581668A (en) * 1978-05-16 1986-04-08 Burroughs Corp. Disk contour cover having air filtration section
FR2441437A1 (fr) * 1978-11-20 1980-06-13 Northrop Corp Dispositif et procede pour l'elimination des agents de contamination renfermes dans les systemes a gaz fermes
US4199329A (en) * 1978-11-20 1980-04-22 Northrop Corporation Process and apparatus for the removal of vaporized contaminants from closed gas system
EP0020933A1 (en) * 1979-06-29 1981-01-07 International Business Machines Corporation Control of relative humidity in disk files
EP0022905A1 (en) * 1979-07-16 1981-01-28 International Business Machines Corporation Enclosed self-purging disk pack units
US4725904A (en) * 1981-10-05 1988-02-16 Tandon Corporation Magnetic disk memory apparatus with improved contamination control
US4587645A (en) * 1984-05-07 1986-05-06 Miniscribe Corporation Disc drive assembly
EP0246625A3 (en) * 1986-05-19 1989-06-07 Fuji Photo Film Co., Ltd. Method of and apparatus for cleaning magnetic recording disk cartridge
US5162053A (en) * 1987-09-24 1992-11-10 Kowalski Jr Walter J Vehicular brake material collection system
US5539595A (en) * 1993-03-02 1996-07-23 International Business Machines Corporation Structure and enclosure assembly for a disk drive
US5872679A (en) * 1993-03-02 1999-02-16 International Business Machines Corporation Structure and enclosure assembly for a disk drive
US5346518A (en) * 1993-03-23 1994-09-13 International Business Machines Corporation Vapor drain system
US6594108B2 (en) * 2001-06-28 2003-07-15 Seagate Technology Llc Disc drive with converging filter inlet for faster cleanup times

Also Published As

Publication number Publication date
GB1258539A (enrdf_load_stackoverflow) 1971-12-30
DE2027711A1 (de) 1971-01-07
FR2052505A5 (enrdf_load_stackoverflow) 1971-04-09
CA925442A (en) 1973-05-01
JPS4926123B1 (enrdf_load_stackoverflow) 1974-07-06
BE751639A (fr) 1970-11-16
DE2027711B2 (de) 1976-03-18

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Legal Events

Date Code Title Description
AS Assignment

Owner name: BURROUGHS CORPORATION

Free format text: MERGER;ASSIGNORS:BURROUGHS CORPORATION A CORP OF MI (MERGED INTO);BURROUGHS DELAWARE INCORPORATEDA DE CORP. (CHANGED TO);REEL/FRAME:004312/0324

Effective date: 19840530

AS Assignment

Owner name: UNISYS CORPORATION, PENNSYLVANIA

Free format text: MERGER;ASSIGNOR:BURROUGHS CORPORATION;REEL/FRAME:005012/0501

Effective date: 19880509