EP0434687A1 - Dispositif rotatif de positionnement pour memoires a disques magnetiques - Google Patents

Dispositif rotatif de positionnement pour memoires a disques magnetiques

Info

Publication number
EP0434687A1
EP0434687A1 EP89906333A EP89906333A EP0434687A1 EP 0434687 A1 EP0434687 A1 EP 0434687A1 EP 89906333 A EP89906333 A EP 89906333A EP 89906333 A EP89906333 A EP 89906333A EP 0434687 A1 EP0434687 A1 EP 0434687A1
Authority
EP
European Patent Office
Prior art keywords
locking
swivel body
spring
latching
rotary
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.)
Ceased
Application number
EP89906333A
Other languages
German (de)
English (en)
Inventor
Josef Immler
Armin Ulber
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0434687A1 publication Critical patent/EP0434687A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • 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
    • G11B5/54—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 into or out of its operative position or across tracks

Definitions

  • the invention relates to a rotary positioning device for a magnetic disk memory according to the preamble of the main claim.
  • Rotary positioners have a swivel part which is rotatably mounted on a positioner axis arranged parallel to the axis of a magnetic disk stack.
  • This swivel part has a number of swivel arms carrying magnetic heads and support arms approximately opposite them with respect to the positioner axis.
  • These either carry a coil which is deflected relative to fixed permanent magnets or a magnet, in which case the excited magnetic coil is then arranged in a fixed manner.
  • the rotary positioner is referred to as a moving coil positioner, in the latter case as a magnet armature positioner. Both types of rotary positioners are equivalent in themselves. Irrespective of the design differences mentioned, the coil in connection with the permanent magnet or magnets is therefore referred to below as the magnetic drive system of the rotary positioner.
  • Such rotary positioners are e.g. B. from IEEE Transactions on Magnetics, Vol. MAG-17, No. 4, July 1981, pages 1392 ff. Or Electronics, April 21, 1982, pages 181 ff.
  • the magnetic heads gliding on an air cushion, fly over the surface of the storage disk without contact. If the relative speed between the magnetic head and the storage disk falls below a minimum, this air cushion collapses, so that the head lands on the disk surface. Such a landing must not happen in the data area of the magnetic disks. Usually, therefore, a landing area is defined on the magnetic storage disk, which corresponds to a rest position of the rotary positioner.
  • the rotary positioner can be swung out of the rest position into the data area only when the disk storage drive is running.
  • a locking device is provided for this purpose, which only releases the rotary positioner after the disk storage drive has been switched on.
  • the latching device has a release magnet which only allows the pivoting part to rotate in the excited state.
  • the release magnet is excited during the entire operating time of the magnetic disk memory, so that its armature remains attracted.
  • the release magnet must therefore be designed for continuous operation, and at the same time it represents an additional electromagnetic interference source during the operation of the magnetic disk memory.
  • a positioning device for a magnetic disk memory with a latching device is known from US Pat. No. 4,710,834, which has a latching magnet instead of a release magnet.
  • the locking magnet is designed in connection with a retaining spring in such a way that after a brief excitation it holds itself mechanically and then releases the swivel part. Only when this pivots back into the rest position does the mechanical locking of the magnet armature trigger, so that the released magnet armature blocks the swiveling part.
  • the dimensioning of the locking magnet is less critical, since it is only briefly energized to release the swivel part.
  • the locking magnet does not carry any current in the normal operating state of the magnetic disk memory and therefore does not form an electromagnetic interference source for the operation of the magnetic disk memory.
  • the locking devices for rotary positioners described nevertheless have one thing in common, namely that an at least briefly excited magnetic element is provided in order to prevent the pivoting part from rotating when the magnetic disk memory is in the idle state.
  • a rotary positioner is necessarily arranged in the interior of the magnetic disk memory together with its latching device.
  • Clean room conditions are sufficient and that, in addition, they do not generate any dirt particles during operation that could contaminate the interior of the magnetic disk storage. Switching magnets with such operating properties and in the required cleaned condition are correspondingly expensive. However, there is no guarantee that they will always meet these requirements.
  • a locking device for a rotary positioner which does not require any locking or release magnets.
  • This locking device includes a locking spring which is fixed to the side of the pivoting part of the rotary positioner and points in the direction of the movement of the pivoting piece when it is guided out of the locking position.
  • this movement is counteracted by a latch, which is rotatably mounted axially parallel to the axis of the rotary positioner and has a latch and a contact surface for the latch spring running at right angles to the latch.
  • the locking pawl is pretensioned by a tension spring and thus prevents the rotary positioner from unintentionally running out of the locking position.
  • the swivel part triggers itself.
  • the pivoting part presses with the free end of the latching spring against the latching nose and rotates the latching pawl while overcoming the counterforce of the tension spring. With the rear edge of the contact surface, the detent pawl bends the detent spring and finally pushes it out of the detent.
  • the pivoting part can thus move freely as long as it does not return to the rest position.
  • the present invention is therefore based on the object of providing a rotary positioning device of the type mentioned at the outset which has a locking device which is improved compared to the known solutions and which is constructed as simply as possible and yet operates reliably.
  • this object is achieved in a rotary positioning device according to the preamble of the main claim with the features described in the characterizing part of this main claim.
  • This solution also does not require a locking or release magnet for a reliable locking device of a rotary positioner.
  • the solution according to the invention is particularly simple in construction and avoids the source of error of limited latching forces which can be overcome by an impact movement of the swivel body. Rather, according to the invention, the release of the swivel body of the rotary positioning device is brought about by a bipolar pulse.
  • the coil of the magnetic drive system is excited so that the swivel body is moved beyond the locking position.
  • the spiral spring is deflected, so that the latching element releases the holding element.
  • a maximum coil current in the opposite direction is fed to the magnet coil of the magnet drive system.
  • the swivel body is accelerated to the maximum from the current end position.
  • the locking element thus released again follows the movement of the swivel body with a certain delay, so that the holding element has already moved out of the engagement area of the locking element before this it resumes its rest position.
  • a positioning control takes over the control of the movement sequences of the positioning device in a conventional manner.
  • the release of the holding element i. H. the release from the locking position takes place without frictional forces between the holding and locking element and therefore no abrasion is possible here.
  • the release forces act essentially point-like on the spiral spring of the latching element, so that the risk of undesired wear is minimized.
  • FIG. 1 shows a schematic sectional view of the construction of a conventional magnetic disk storage device with a rotating stack of disks and a rotary positioning device assigned to it,
  • FIG. 2 shows a detailed view of this rotary positioning device, in particular with regard to the latching device used with it,
  • FIG. 3 shows a functional sketch of the latching device in a further detailed view
  • FIG. 4 shows a further detailed view of an embodiment of the tooth flanks of a holding element and a latching lug of the latching device that is latched to it
  • FIG. 5 shows a first pulse diagram which schematically represents a corresponding voltage curve on an excitation coil of the magnetic drive system when the rotary positioning device runs into the rest position.
  • FIG. 6 shows a second pulse diagram which illustrates the voltage curve on the excitation coil of the magnetic drive system of the rotary positioning device for releasing the rotary positioning device when the magnetic disk memory is started up and
  • FIG. 7 shows a further exemplary embodiment of a latching device designed according to the invention.
  • FIG. 1 a magnetic disk memory is shown in a section with its essential structural units.
  • a magnetic disk stack 1 is shown schematically, which rotates on a hub 2 in the direction of the arrow.
  • a rotary positioner 3, which carries magnetic heads 4, is arranged to the side of the magnetic disk stack 1.
  • the rotary positioner is simplified in this illustration and is shown in an assembly position moved out of the magnetic disk stack 1.
  • the rotary positioner 3 has, for example, a U-shaped bearing block 5, on the leg ends of which a positioner axis 6 is fixed parallel to the axis of the magnetic disk stack 1.
  • the bearing block 5 is arranged with fastening screws 7 on an inner wall of a housing 8 of the magnetic disk memory.
  • a magnetic core 9 designed as a circular ring section is visible.
  • Correspondingly shaped permanent magnets 10 are arranged on both sides of the magnetic core 9.
  • a reflux plate 11 is fixed as a magnetic yoke at the free-standing ends of the magnetic core 9 or the permanent magnets 10.
  • a swivel body 12 is rotatably mounted on the positioner axis 6. This has swivel arms 13 or support arms 14. On each of the swivel arms, a pair of magnetic heads 4 is resiliently fixed via a base plate 15.
  • a magnet coil 16 is arranged on the support arms 14 and encompasses the magnet core 9.
  • the magnetic heads 4 are normally pivoted into the magnetic disk stack 1 and are thus positioned above one of the surfaces of the individual magnetic storage disks of the disk stack 1.
  • 1 schematically indicates that each surface of a storage disk of the magnetic disk stack 1 is divided into three areas in the radial direction.
  • the actual data area 103 with a large number of data tracks 104 lies between an outer edge zone 101 and an inner edge zone 102.
  • the magnetic heads 4 are each positioned over a selected data track.
  • the track positioning is not important in the present context, therefore a circuit board 17 is shown schematically in FIG. 1, which is connected to the magnet coil 16 via connecting lines 18.
  • a regulated voltage v is supplied to the magnet coil 16, which causes the desired rotational movement of the rotary positioner 3.
  • the magnetic heads 4 fly on an air cushion above the storage disks of the magnetic disk stack 1. Below a critical speed of the magnetic disk stack 1, this air cushion collapses and the magnetic heads 4 land on the surfaces of the magnetic disk stack 1. To prevent damage in the data area 103 To avoid, the inner landing zone 102 is defined here as the landing zone.
  • the rotary positioner 3 In order to ensure this landing in the defined landing zone, the rotary positioner 3 is known to be automatically pivoted into a rest position when the magnetic disk stack 1 is taken out of operation, but also in the event of a fault. Locking devices are usually provided which prevent the rotary position of the rotary position from rotating. Prevent nierers 3 until the magnetic disk stack 1 rotates again when starting up again at a speed that is above the critical speed mentioned.
  • FIG. 2 shows a detail of a detail of the rotary positioner 3 described with such a locking device.
  • a spiral spring is arranged as a locking element 19, which is fixed on one side to the bearing block 5 or its backflow plate 11 by means of screws 20 and is referred to below as a locking spring.
  • the detent spring 19 has at its free end a detent hook 21 angled in the direction of the positioner axis 6.
  • the latching spring 19 is cranked approximately below 45 "and thus forms a run-up surface 22 that is inclined in the range of rotation of the support arm 14. As shown in FIG. 2, this run-up surface 22 is preferably the fastening end of the detent spring 19 arranged close to each other.
  • This latching device is assigned a holding element 23, which projects essentially radially and protrudes from the outer boundary surface of the support arm 14. It is rigid and arranged in such a way that when the rotary position 3 rotates into its rest position, ie in the example a counterclockwise rotary movement, it runs onto the latching hook 21 of the latching spring 19, deflects it with elastic deformation of the latching spring 19 and finally hooked up with him.
  • a stop bracket 24 is fixed on the backflow plate 11 of the bearing block 5. It is designed and arranged in such a way that it limits the rotary movement of the rotary positioner 3 when it returns to its rest position.
  • a damping element 25 is preferably arranged on the surface of the stop bracket 24 facing the side surface of the support arm 14.
  • FIG. 3 schematically shows the principle of the latching device just described, but now in the rest position of the Rotary positioner 3 shown.
  • the illustration in FIG. 3 shows that the contact surface 22 of the detent spring 19 corresponds to a run-up slope 26 of the support arm 14.
  • FIG. 3 also shows other possible configurations of the latching device for influencing the spring characteristic or the mass moment of inertia.
  • the effective spring force is primarily due to the elasticity of the material used for the detent spring 19, but it can also be influenced, for example, by an additional mass element 27 and / or by the fact that an air chamber 28 is provided which is relatively by the detent spring 19 tightly sealed, but as free of friction as possible.
  • Figure 3 further illustrates kinematic relationships.
  • the entire resilient length of the detent spring 19 corresponds to the distance of the detent hook 21 from the point of attachment of the detent spring 19 to the return flow plate 11.
  • the sum of these distances xl and x2 results in the effective spring length of the detent spring 19, xl being chosen to be significantly smaller than x2.
  • the ratio of these distances then also determines the ratio of a spring travel y2 of the latching hook 21 in relation to the resilient deflection in the area of the contact surface 22, as can be seen immediately.
  • FIG. 4 finally illustrates a further detail of the design of the latching device in a side view of the latching hook 21 and the holding element 23 in the direction of an arrow IV according to FIG. 3.
  • This detailed illustration illustrates an end surface 29 of the latching hook 21 designed as a chamfer. which is cut obliquely with respect to the correspondingly shaped end face of the holding element 23. This allows the friction losses when deflecting the detent spring 19 to be largely reduced by the holding element 23 when the rotary positioner 3 runs into its rest position.
  • the pulse diagrams of FIGS. 5 and 6 finally illustrate the function of the magnetic drive system of the rotary positioner 3 when it enters its rest position or when it is released from the rest position.
  • FIG. 5 and 6 finally illustrate the function of the magnetic drive system of the rotary positioner 3 when it enters its rest position or when it is released from the rest position.
  • FIG. 5 shows the pulse shape for the regulated voltage v, which is supplied to the magnet coil 16 via the connecting lines 18 in order to return the rotary positioner 3 to its rest position.
  • the corresponding regulated voltage v is frequently generated from the kinetic energy of the disk stack that is still running. Even in the event of a power failure, a sufficient regulated voltage v is nevertheless available to safely return the rotary positioner 3 to its rest position.
  • FIG. 5 illustrates this function, insofar as it is of interest here.
  • a regulated voltage v with a relatively low negative amplitude which in the example may be ⁇ 1 V, is supplied to the magnet coil 16 from this point in time.
  • the magnetic drive system of the rotary positioner 3 is excited in such a way that the swivel body 12 swivels into the rest position at a moderate speed. In the example it is assumed that this position is reached at a later time t2.
  • the dimensioning of the time axis t on a second scale illustrates that this process of pivoting the rotary positioner 3 into its rest position takes place relatively slowly.
  • the bipolar pulse sequence shown in FIG. 6 for the regulated voltage v characterizes the excitation states of the magnetic drive system 9, 10, 16 of the rotary positioner 3 in order to unlock the swivel body 12.
  • the drive for the magnetic disk stack 1 is first activated.
  • the buoyancy forces are formed which separate the magnetic heads 4 from the assigned surfaces of the Release the magnetic disk stack 1.
  • the locking of the swivel body 12 of the rotary positioner 3 can be released.
  • the magnetic coil 16 of the rotary positioner 3 is supplied with a strong voltage pulse with negative polarity at a time t3.
  • the polarity of the voltage v is identical to the polarity of the voltage pulse that led the rotary positioner 3 to pivot into its rest position.
  • the swivel body 12 is therefore moved further in the direction of the arrow 30 with a torque corresponding to the excitation.
  • the support arm 14 presses with its ramp bevel 26 with full force against the contact surface 22 of the detent spring 19 and deflects it.
  • the holding element 21 releases the locking lug 23.
  • the voltage v on the magnetic coil 16 is reversed and a pulse of positive polarity and high amplitude is thus supplied to it. Characterized the swivel body 12 is moved against the direction of arrow 30 with high acceleration, so that the holding element 23 passes the locking hook 21 before the locking spring 19 springs back after its release by the ramp slope 26 of the support arm 14. At a time t5, the magnetic heads 4 have reached a selected track.
  • a positioning control controls all further movement sequences of the positioning device 3 in a conventional manner. In the swung-out state, the rotary positioner 3 can be freely positioned as long as it is not returned to the rest position.
  • FIG. 7 Another embodiment of the locking device is shown in FIG. 7 in a three-dimensional view.
  • the swivel body 12 with a support arm 14 is only shown schematically in the detail.
  • the holding element 23 projects radially from the support arm 14.
  • the locking direction For example, a locking pawl 31, which is rotatably mounted on a rigid axis 32 arranged fixed to the housing and parallel to the axis of the positioning axis 6.
  • a tension spring 33 is arranged on the longitudinal side of the latch 31 facing the support arm 14 of the swivel body 12.
  • the tension spring 33 is clamped on one side at an end of the latching pawl 31 near the pivot point between a fastening plate 34 and the latching pawl 31, the fastening plate 34 being fixed to the latching pawl 31, for example, by means of an electron beam welded connection.
  • the tension spring 33 is bent in a U-shape at its free end opposite the clamping end and bears against a stop bolt 35 which forms a rotation limitation for the latching pawl 31 and is arranged fixed to the housing.
  • the tension spring 33 is at least partially slotted between its clamping point and its free end. In the latching position shown in FIG. 7, the tooth-shaped holding element 23 extends through this slot 36 and is latched to a latching nose 37 which protrudes from the longitudinal side of the latching pawl 31.
  • the rear side of the support arm 14 projects at a predetermined distance from the stop 24 forming the rotational limitation of the swivel body 12, which is designed here as a stop pin arranged fixed to the housing.
  • This distance is identical to the elevator path ⁇ x of the support arm 14 in the first phase of the release movement.
  • the support arm 14 is moved in the direction of arrow 30 toward the stop 24 in the first phase of the release movement.
  • the tooth-shaped holding element 23 moves with the support arm counterclockwise and takes the tension spring 32 with it by engaging at the end of the slot 36.
  • the holding element 23 lifts off the engagement flank of the latching lug 37 and deflects the latching pawl 31 in a clockwise direction by the engagement on the tension spring 32.
  • the elevator path ⁇ x is measured in relation to the pivoting movement of the latching pawl such that the holding element 23 is no longer in engagement with the latching nose 37 of the latching pawl 31 at the end of the elevator path.
  • the mass of the locking pawl 31 is dimensioned in connection with the pretensioning of the tension spring 32 so that the holding element 23 only flows freely past the locking lug 37 when the swivel body 12 and thus also its support arm 14 in the second phase of the triggering movement -
  • the direction of movement of the support arm 14 then runs in the clockwise direction of the arrow 30 - is moved into the operating position with full acceleration by the drive system of the rotary positioner.
  • the same conditions apply to the triggering movement as have already been explained in connection with FIG. 5 and in particular FIG. 6, so that a repetition is not necessary here.
  • the release from the detent position is not triggered by forces overcoming the detent position, but rather by a countermovement. If this counter movement - caused, for example, by a shock - does not take place in connection with a maximum acceleration in the opposite direction of movement, it remains ineffective because the catch 31 then falls back into its catch position before the holding element 23 on the catch 37 ran past.

Landscapes

  • Moving Of Heads (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)

Abstract

Un pivot rotatif (12) d'un dispositif rotatif de positionnement d'une mémoire à disques magnétiques comprend, outre des bras rotatifs (15) de support de têtes magnétiques (4), des bras de support (14) d'un élément mobile (16) d'un système d'entraînement magnétique. Un dispositif d'encliquetage qui libère le pivot uniquement pendant le fonctionnement de la mémoire à disques comprend un élément de retenue (23) radialement écarté du pivot et un élément d'encliquetage (19). Dans le cas le plus simple, ce dernier est un ressort à lames qui s'encliquette dans une position prédéterminée d'encliquetage derrière l'élément de retenue lorsque le pivot se met en marche. Afin de libérer l'élément de retenue, une impulsion bipolaire de libération (v) est appliquée au système magnétique d'entraînement (9, 10, 16) de façon à éloigner le pivot de la position de libération, en passant par la position d'encliquetage, en libérant le dispositif d'encliquetage, puis déplace le pivot avec une accélération maximale jusqu'à la position de libération, en passant par l'élément d'encliquetage décliqueté.
EP89906333A 1988-09-16 1989-06-05 Dispositif rotatif de positionnement pour memoires a disques magnetiques Ceased EP0434687A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8800580 1988-09-16
WOPCT/DE88/00580 1988-09-16

Publications (1)

Publication Number Publication Date
EP0434687A1 true EP0434687A1 (fr) 1991-07-03

Family

ID=6819716

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89906333A Ceased EP0434687A1 (fr) 1988-09-16 1989-06-05 Dispositif rotatif de positionnement pour memoires a disques magnetiques

Country Status (4)

Country Link
US (1) US5117318A (fr)
EP (1) EP0434687A1 (fr)
JP (1) JPH04500739A (fr)
WO (1) WO1990003029A1 (fr)

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US5363261A (en) * 1993-11-10 1994-11-08 International Business Machines Corporation Disk drive actuator latch
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US5448436A (en) * 1994-03-14 1995-09-05 International Business Machines Corporation Disk drive with shock-resistant rotary actuator
US5828522A (en) * 1994-09-13 1998-10-27 International Business Machines Corporation Velocity control of head load/unload mechanism in a disk drive using dither
JPH08212737A (ja) * 1995-02-02 1996-08-20 Fujitsu Ltd ディスク装置のロータリー型アクチュエータ
US5812345A (en) * 1995-06-07 1998-09-22 Maxtor Corporation Monostable active latch for a disk drive actuator
US5798884A (en) 1995-12-13 1998-08-25 International Business Machines Corporation Multiple zone data storage system and method
US5729399A (en) * 1995-12-13 1998-03-17 International Business Machines Corporation Contact start/stop disk drive with minimized head-disk wear in textured landing zone
US5666243A (en) * 1996-09-03 1997-09-09 Seagate Technology, Inc. Spring loaded stacked actuator assembly
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JP2005038555A (ja) * 2003-07-18 2005-02-10 Matsushita Electric Ind Co Ltd 慣性ラッチ機構及びそれを用いた情報記録装置
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Also Published As

Publication number Publication date
US5117318A (en) 1992-05-26
WO1990003029A1 (fr) 1990-03-22
JPH04500739A (ja) 1992-02-06

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