US3132328A - Reading and writing head mounting means - Google Patents

Reading and writing head mounting means Download PDF

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Publication number
US3132328A
US3132328A US840325A US84032559A US3132328A US 3132328 A US3132328 A US 3132328A US 840325 A US840325 A US 840325A US 84032559 A US84032559 A US 84032559A US 3132328 A US3132328 A US 3132328A
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US
United States
Prior art keywords
carrier
drum
nozzle
base
control means
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
US840325A
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English (en)
Inventor
Maurice K Taylor
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.)
Ferranti Packard Ltd
Ferranti Packard Electric Ltd
Original Assignee
Ferranti Packard Ltd
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
Application filed by Ferranti Packard Ltd filed Critical Ferranti Packard Ltd
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Publication of US3132328A publication Critical patent/US3132328A/en
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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/60—Fluid-dynamic spacing of heads from record-carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed

Definitions

  • This invention relates to a device for maintaining the distance between reading and/ or writing heads of a computer at a predetermined distance from the recording surface of the drum or the like in connection with which they operate.
  • the distance between the reading and/or writing heads of the computer and the recording surface of the drum upon which they operate, must be kept within fairly close limits for good operation. In the past, this has meant that the recording drums, which are relatively large, must be manufactured to very close tolerances if one is to be able to interchange recording drums on a machine.
  • I mount the reading and/ or writing head on a carrier that is adjustably mounted with respect to the base and that supports the heads in various degrees of proximity to the recording surfaces of the drum.
  • a pneumatic control means including a nozzle that is adapted in use to discharge against a drum surface, exerts a force on the carrier, tending to urge it away from the drum'and against a compensating means that exerts a force on the carrier towards the drum.
  • the pressure in the control means is a function of the distance between the nozzle and the recording surface of the drum and the control means responds to changes in this pressure to keep the carrier a constant distance from the drum.
  • FIGURE 1 is a front view of a nozzle adjusting means according to this invention.
  • FIGURE 2 is a plan view of FIGURE 1.
  • the computer to which this invention has been applied is not illustrated in detail. It is, however, a computer of the type referred to in Canadian Patent No. 598,482, issued on May 24, 1960. It has a recording drum, a portion of the cylindrical recording surface of which is indi cated by the numeral 10 and one or more reading and/ or writing heads 12, mounted in proximity to the recording surface 10 of the drum. The numeral 14 indicates the input to the reading and/or writing heads 12.
  • the reading and/ or writing heads 12 are mounted in a vertically extending series on the panel 16 of the carrier "Ice 18 which is in turn, adjustably mounted with respect to a base 20 by means of the flexible strips 22 whereby the carrier is adjustable with respect to the base 20 to support the reading and/ or writing heads 12 in various degrees of proximity to the recording surface ll) of the drum.
  • the base 20 is bolted to the base of the computer within which storage drum It) is mounted so that, in effect, it becomes a portion of the base of the computer.
  • the carrier for the heads 12 is adjustably mounted as aforesaid.
  • Pneumatic control means including a control nozzle 30 and, in the embodiment illustrated, a bellows 32 that connects with the central standard 34 of the base at one of its ends and with the carrier 18 at the other of its ends, is provided and in use it operates against a compensating means, which in the embodiment of the invention illustrated, comprises a bellows 36 that connects at one of its ends with the standard 34 of the base and at the other of its ends with the carrier 18.
  • the device is pneumatically operated and means are provided for supplying air or the like to the pneumatic control means and compensating means.
  • nozzle 30 similar to the one shown in FIG- URE 2, at each extremity of the carrier 18 each of which are mounted on the carrier to discharge against the surface of the drum 10 so that, as will be explained later, the pressure in the nozzle is a function of the distance between the nozzle and the drum surface.
  • Air for the nozzle and the control bellows 32 is supplied from the line 49, through the restriction of the needle valves 42, through the tubes 44, and the tubes 46. It will be noted that the interior of the bellows 32 communicates with the tube 46 through the tube 48.
  • Air is supplied to the compensating bellows 36 through the supply tube 40, the restriction of the needle valves 50 and the tubes 52.
  • air is supplied through the tube 40 to the bellows 32 and the nozzle 30. It discharges from the nozzles 30 against the drum 10 to cause a build-up of pressure in the bellows 32 that is a function of the distance between the discharge end of the nozzle 30 and the drum surface It). If, for example, the distance is small, the pressure build-up in the bellows 32 will tend to be relatively great. If the distance is increased, the pressure build-up in the bellows 32 will not be reduced. Thus the bellows 32 at each end of the carrier 18, tend to expand and move the carrier away from the drum when the distance between the discharge end of the nozzle and the drum becomes small. They contract, as a result of forces of the compensating bellows 36 to be referred to later, when the pressure therein is reduced.
  • the force of the compensating bellows 36 is adjusted to be constant during operation and maintain the nozzles 30 a predetermined distance from the surface of the drum. It will be apparent that because of the leakage from the control nozzle the pressure in the control bellows will be substantially less than the pressure in the compensating bellows 36 since the pressure in the compensating bellows is line pressure. Thus the surfaces upon which the pressure in the compensating bellows 36 operate must be proportionately smaller than the surfaces on which the pressure in the control bellows 32 operate, in order that the two maybe in equilibrium with the nozzles at a predetermined distance from the recording head 10.
  • the exterior of the bellows 36 has been illustrated as being of v,
  • the restriction in the needle valves 42 should provide a relatively high impedance to the flow of air as compared to the impedance of the nozzle 30, so that the air flow to the control bellows is small.
  • the restriction of the valves 59 serves to limit the fast build up of the compensating bellows with the resulting abrupt forward movement of the carrier when the air pressure is initially turned on.
  • the essence of the invention is the provision of a pneumatic control means that operates against a compensating means and that responds to a pressure, as determined by proximity of the reading heads to a surface such as the surface 10.
  • the numeral 60 refers to a spring compressed between the standard 34 of the base and the carrier 36 to urge the nozzle away from the surface 10 when the pneumatic device is not operating.
  • the spring is of relatively light tension and does not affect the operation of the bellows when the pressure in the device is up.
  • the discharge of the nozzles against the side of the drum 10 cause a build up of pressure within the bellows 32 whereby they exert a force against the force of the compensating bellows 36.
  • Compensating bellows 36 have a force as determined by operating line pressure.
  • the pressure in the control bellows 32 would drop because of the more free escape of air from the nozzles 30.
  • the force exerted by the compensating bellows on the carrier, previously in equilibrium with the force of the control bellows is now greater than the force exerted by the control bellows 32 and the compensating bellows move the carrier towards the drum as it expands.
  • This movement carries the nozzle closer to the drum with a resulting build up of pressure in the control bellows 32 due to the decreased distance between the nozzles 30 and the drum.
  • the movement of the compensating bellows will stop when the pressure in the control bellows 32 is again such that the force of the two bellows are in equilibrium and the distance between the nozzle and the drum is maintained as predetermined.
  • the predetermined distance can be adjusted by adjusting the force of the compensating bellows 36.
  • an improved mounting for said reading and/0r writing heads comprising a carrier for said heads adjustably mounted with respect to said base to support said heads in various degrees of proximity to the recording surface of said drum, pneumatic control means connected to said base and to said carrier, said pneumatic control means including a control nozzle mounted on said carrier to discharge against a surface of said drum whereby the pressure in said nozzle is a function of the distance between said nozzle and said drum surface, compensating means connecting with said base and with said carrier to exert a constant predetermined force on said carrier in the direction of said drum surface, said control means being responsive to pressure in said nozzle to exert a force on said carrier in a direction away from said drum surface, the force of said compensating means on said carrier being adapted to oppose the force of said control means on said carrier and to balance the force of said control means when said nozzle is a predetermined distance from said recording surface of said
  • an improved mounting for said reading and/or 'writing heads comprising a carrier for said heads adjustably mounted with respect to said base to support said ends in various degrees of proximity to the recording surface of said drum, pneumatic control means connected to said base and to said carrier, said pneumatic control means including a control nozzle mounted on said carrier to discharge against a surface of said drum whereby th pressure in said nozzle is a function of the distance between said nozzle and said drum surface, compensating means connecting with said base and with said carrier to exert a constant predetermined force on said carrier in the direction of said drum surface, said control means being responsive to pressure in said nozzle to exert a force on said carrier in a direction away from said drum surface, the force of said compensating means on said carrier being adapted to oppose the force of said control means on said carrier and to balance the force of said control means when said nozzle is a predetermined distance from said recording surface
  • an improved mounting for said reading and/ or writing heads comprising a carrier for said heads adjustably mounted with respect to said base to support said heads in various degrees of proximity to the recording surface of said drum, pneumatic control means connected to said base and to said carrier, said pneumatic control means including a control nozzle mounted on said carrier to discharge against a surface of said drum whereby the pressure in said nozzle is a function of the distance between said nozzle and said drum surface, compensating means connecting with said base and with said carrier to exert a constant predetermined force on said carrier in the direction of said drum surface, said control means being responsive to pressure in said nozzle to exert a force on said carrier in a direction away from said drum surface, the force of said compensating means on said carrier being adapted to oppose the force of said control means on said carrier and to balance the force of said control means when said nozzle is a predetermined distance from said recording surface of said drum
  • a computer having a base, a storage drum on said base and a plurality of reading and/ or writing heads mounted in proximity to the recording surface of said drum, and improved mounting for said reading and/ or writing heads comprising a carrier for said heads adjustably mounted with respect to said base to support said heads in various degrees of proximity to the recording surface of said drum, pneumatic control means connected to said base and to said carrier, said penumatic control means including a control nozzle mounted on said carrier to discharge against a surface of said drum whereby the pressure in said nozzle is a function of the distance between said nozzle and said drum surface, compensating means connecting with said base and with said carrier to exert a constant predetermined force on said carrier in the direction of said drum surface, said control means being responsive to pressure in said nozzle to exert a force on said carrier in a direction away from said drum surface, the force of said compensating means on said carrier being adapted to oppose the force of said control means on said carrier and to balance the force of said control means when said nozzle is a predetermined distance from said recording surface of said recording
  • control means has a plurality of nozzles spaced apart on said carrier.

Landscapes

  • Ink Jet (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)
US840325A 1958-09-19 1959-09-16 Reading and writing head mounting means Expired - Lifetime US3132328A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA758913 1958-09-19

Publications (1)

Publication Number Publication Date
US3132328A true US3132328A (en) 1964-05-05

Family

ID=4141067

Family Applications (1)

Application Number Title Priority Date Filing Date
US840325A Expired - Lifetime US3132328A (en) 1958-09-19 1959-09-16 Reading and writing head mounting means

Country Status (6)

Country Link
US (1) US3132328A (ru)
CH (1) CH374722A (ru)
DE (1) DE1148596B (ru)
FR (1) FR1235162A (ru)
GB (1) GB864744A (ru)
NL (1) NL126117C (ru)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894180A (en) * 1973-11-05 1975-07-08 Mca Disco Vision Head height control system
US4006294A (en) * 1975-05-27 1977-02-01 Mca Disco-Vision, Inc. Transducer head assembly with fluid bearing and head height control system
US4074283A (en) * 1975-05-05 1978-02-14 Siemens Aktiengesellschaft Non-mechanical printer operating in accordance with an electrographic process
US5390059A (en) * 1989-06-01 1995-02-14 Hitachi, Ltd. Flying head slider supporting mechanism having active air pressure control

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441044A (en) * 1946-07-26 1948-05-04 Atomic Energy Commission Switching and timing unit for pneumatic relays
DE1020803B (de) * 1954-11-04 1957-12-12 Zuse K G Vorrichtung zum Aufzeichnen bzw. Abtasten von Signalten auf Aufzeichnungstraegern
US2905768A (en) * 1954-09-24 1959-09-22 Ibm Air head
US2928709A (en) * 1955-11-07 1960-03-15 Ibm Externally pressurized fluid bearing
US2937240A (en) * 1957-06-18 1960-05-17 Ibm Self-loading hydro-dynamic bearing
US2949123A (en) * 1955-11-02 1960-08-16 Perc C Sorenson Fluid flow determining apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1050076B (de) * 1959-02-05 IBM Deutschland Internationale Büro-Maschinen Gesellschaft m.b.H., Sindelfingen (Württ.) Magnetkopf mit Abstand vom Aufzeichnungsträger
DE1065629B (ru) * 1954-01-25
NL194026A (ru) * 1954-09-15
US2921144A (en) * 1956-02-06 1960-01-12 Ibm Transducer support for sound recording or reproducing system
DE1029583B (de) * 1956-04-07 1958-05-08 Ibm Deutschland UEbertragungskopf fuer magnetische oder elektrostatische Aufzeichnung und Abtastung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441044A (en) * 1946-07-26 1948-05-04 Atomic Energy Commission Switching and timing unit for pneumatic relays
US2905768A (en) * 1954-09-24 1959-09-22 Ibm Air head
DE1020803B (de) * 1954-11-04 1957-12-12 Zuse K G Vorrichtung zum Aufzeichnen bzw. Abtasten von Signalten auf Aufzeichnungstraegern
US2949123A (en) * 1955-11-02 1960-08-16 Perc C Sorenson Fluid flow determining apparatus
US2928709A (en) * 1955-11-07 1960-03-15 Ibm Externally pressurized fluid bearing
US2937240A (en) * 1957-06-18 1960-05-17 Ibm Self-loading hydro-dynamic bearing

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894180A (en) * 1973-11-05 1975-07-08 Mca Disco Vision Head height control system
US4074283A (en) * 1975-05-05 1978-02-14 Siemens Aktiengesellschaft Non-mechanical printer operating in accordance with an electrographic process
US4006294A (en) * 1975-05-27 1977-02-01 Mca Disco-Vision, Inc. Transducer head assembly with fluid bearing and head height control system
US5390059A (en) * 1989-06-01 1995-02-14 Hitachi, Ltd. Flying head slider supporting mechanism having active air pressure control

Also Published As

Publication number Publication date
GB864744A (en) 1961-04-06
DE1148596B (de) 1963-05-16
FR1235162A (fr) 1960-07-01
NL126117C (ru)
CH374722A (de) 1964-01-31

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