DE2440822A1 - DEVICE AND METHOD FOR MOUNTING AND LIFTING TRANSFER HEADS - Google Patents

Description

25 W q / li

XEROX CORPORATION, Röchest er, N. Y. / USA

Device and method for setting up and lifting off pick-ups -

The invention relates to a device and a method for setting up and lifting off transfer heads. It relates generally to devices for moving transducers too and from a working position with respect to a stack of rotating magnetic disks in a disk storage system and in particular, improvements in such devices to reduce disk wear and withdraw their heads in the event of a power failure.

Magnetic disk storage systems have been used for a long time turns to build usable large-volume memory at relatively low cost for electronic cal calculator. A typical disk storage device

509817/1144

24ΑΌ822

sits a number of with a suitable magnetic material coated discs, which on a common spindle for performing a rotary movement are mounted. It also has a sentence of each pair of elongated beams for an insertion between adjacent disks carried transducers. Show the heads of each couple in opposite directions to capture opposite faces of adjacent slices. During normal operation, a positions depending on a control signal from a computer working linear actuator, the transfer heads in the radial direction for recording or retrieval of data signals on or from a preselected track of a series of concentric recording tracks on the discs. Once the transmission heads are in their working position adjacent to the disk surfaces, they are normally opposite one another direct contact with the surfaces caused by the rapid rotation of the disks Air cushion held back. However, for the first time, the pick-ups are placed on the disks in their Working position "removed" or moved to their working position, so can be done until an air cushion is built up has direct contact. The discs can therefore due to the abrasion in the contact areas suffer a minor but steadily increasing surface damage. A related one The problem is the sometimes irreparable damage caused by the failure of electrical Energy can occur, whereby the disks reduce their speed and it is thereby possible that place the transducers on the disc surfaces while touching them.

509 81 77 1U4

In previously known SclieibenspeicliBrvori'icilituiigen> of the type described is 'the' because of the · Afoset- - ¹ 'zens of heads occurring on ScheibenirersölileiB ■ ^"■"; "the outermost outside the ^{Aufnahmespuren'liegen-':} limits the Oberflächenbereicne, ¹ and "because of the constant dropping of the 'heads in'under-" the circumference of the disks. Normally, in such devices, the heads are pressed against the disk surfaces by springs or torsion bars acting on the head carriers. Adjacent to the disks a number of fixed control surfaces are arranged in order to place the transfer heads on or to lift them off, for example in order to move them towards or away from the disk surfaces, in areas which are in the vicinity of the disk circumference when the heads are between the discs are pushed in or withdrawn from the discs. Therefore, there is significant and steadily accumulating wear near the disc periphery and, although the recording tracks themselves are not affected, a significant area of each disc is not applicable for recording purposes. The constant wear and tear can also lead to soiling of the heads and other parts. ■ · '. "

One possible solution to this problem is the control surfaces to arrange for movement with the heads and provision for relative movement of the control surfaces and the heads only during the touchdown and To meet the withdrawal process. However, this increases the mass which must be moved by the linear actuator and includes a high-speed operation of the disk storage system.

The related problem of possible damage to the discs in the event of a power failure in

50 9817/1144

disk storage systems known to date make the use of capacitors or some other source of power necessary to supply sufficient electrical energy to the actuator to power the transducers to withdraw and lift off the panes after the power failure occurs. This movement process is not completely reliable as it depends on electrical components that are never suitable Way can be tested as long as they do not come into operation directly. Likewise, a broken line can to the coil of the actuator make this ineffective. It is therefore evident that there is a significant need for reliable facilities for placing the transmitter heads exists in magnetic disk storage systems without significant disk wear. Furthermore, there is a significant. need for reliable facilities, in which the heads can be lifted off and retracted without damaging the disk if the drive energy is used fails or is switched off. The present invention covers this need.

The present invention comprises a method and apparatus for depositing transfer heads on the Disc surfaces of areas lying essentially within the disc circumference and reduces the Disc wear in these areas to a minimum by maintaining the movement of the heads radially inwards, in order to distribute the possible wear over a large area of each disk and thus the wear per unit area to a minimum. Another important aspect of the invention in the event of a failure of the drive energy in the mode of operation, the heads by mechanical devices lift off and retract without damaging the panes

509817/1144

Fundamentally and in general terms, that is according to the invention Device characterized by transfer head support devices, mechanical devices ^ for moving the heads to a working position adjacent to the disks, and further devices for coupling the movements of the mechanical devices and the transfer head support devices to the transfer heads in positions substantially within the Remove the circumferences of the panes. In particular, the device comprises a set of transducer head supports, which for insertion between the panes are mounted on a holding carriage which, with respect to the Discs is radially movable, control devices, which are also radially movable in order to have control surfaces to cooperate on the transducer head carriers and thereby the heads to the disk surfaces to or from moving this way, and mechanical connecting devices for moving the control devices inward between the discs as a result of the inward movement of the Holding carriage, then move outwards after the heads have been placed on the discs and the holding carriage continues its inward movement.

The transducer head supports are preferred in one present Embodiment designed as elastic torsion bars, each having a fixed end that is attached to the holding carriage, and have a free end that can be pushed in between two adjacent discs, around two transducers by torsional force in contact with the discs to 'press, with a transfer head against the upper surface the lower adjacent disk and the other transfer head against the lower surface of the upper one adjacent disc is pressed. The control devices preferably comprise a control tower, for example a vertical row of controls,

509817/1 U4

one for each transfer head, ■ with ramp-like surfaces which are arranged in such a way that they cooperate with corresponding surfaces on the transfer head carriers _{v to} lift the heads off the disk surfaces when they are moved outwards and against the control tower and around the heads on the Drop disk surfaces as they are moved in and away from the control tower.

In a retracted position, the transfer head supports are held opposite by the control elements moving the transfer heads against the disks, and as long as the control tower and the holding carriage are moved together, the transfer heads can be placed between the panes without touching the pane surfaces be inserted. According to the procedure according to the invention, the transfer heads are in the direction moves onto the surfaces, moving over them. More precisely: the transfer heads and their corresponding control elements are pushed together between the panes and, as soon as the touch-down position for the pick-ups is reached, the inward movement of the control tower is reversed, causing it the transfer head carriers is enabled, the transfer heads in contact with the discs. The control tower is then withdrawn to allow the transmitter heads placed on any desired recording track without touching the controls can be. Since the control tower is arranged independently of the holding carriage, it can be carried out very easily in order to more easily enable high-speed operation of the disk storage system to enable.

Correct inward and then outward movement of the Control tower is in the preferred embodiment

509817 / 1U4

by the mechanical connecting device already mentioned at the beginning brought about. Basically, the mechanical connection comprises a radially displaceable block, which on one side a suitably shaped Has groove to create a linear guide element. An L-shaped lever is in his elbow area rotatable and has one end adapted for a guide in the groove, while the other end on the control tower is hinged. If the holding carriage is moved inward to set down the transfer heads, it moves the sliding block under control of the L-shaped lever due to the effectiveness of the appropriately shaped Groove also inwards and turn the lever first in one direction and then in the other. The control tower is thereby moved first inwards and then outwards as long as the L-shaped lever is rotated through the groove and as long as the holding carriage for placing the transfer heads moves inwards.

In a present preferred embodiment, after the transfer heads are deposited, the Inward movement of the holding carriage continued until the transfer heads are behind the innermost recording track have been moved and the sliding block in this innermost position by an electrically operated Locking device is held · As a result, the transfer heads can be controlled by the linear actuator can be positioned anywhere between the innermost and outermost recording tracks without affecting the controls to meet and without further movement of the movable block. In the event of a failure or a Interrupting the driving force, the locking device releases the movable block and one The spring pulls the block radially outward, making the L-shaped Lever is set in rotation, the transmission

509817/1 144

heads off the discs and pushes the holding carriage back into its retracted position.

From the foregoing it can be seen that the present invention compared to known devices has significant advantages for placing pick-ups. More precisely: the invention eliminates practically the problem of the constantly adding wear of the disk surfaces due to the settling of the pick-ups. The invention also provides reliable devices for putting on and pulling back the transfer heads created in the event of a failure or an interruption in the power supply. The invention also permits the use of relatively lightweight transducer head moving devices for high speed operation. Further aspects and advantages of the invention are disclosed in US Pat will be apparent from the following, more detailed description, which refers to the accompanying drawings.

1 is a perspective view of a portion of a magnetic disk storage system incorporating the present invention Used pick-up loading mechanism, with the mechanical connection between the holding carriage and the control tower is indicated in dashed lines,

Figure 2 is an enlarged front view of the mechanical linkage of Figure 1 in a fully retracted position Position, with the holding carriage, the control tower, the transfer heads and an L-shaped lever being the better Are shown in a greatly simplified form for the sake of clarity,

Figs. J through 5 are views similar to Fig. 2, wherein the transducer head each in one position from the

509817/1 Hü

In the middle of its way to the pick-up loading position, in the pick-up loading position and is shown in its innermost position,

6 is an enlarged perspective view of a pair of controls as used in the present invention Invention can be used,

7 is an enlarged front end view of various transmitter head supports and controls; wherein the transducer heads in an uncharged, restrained from contact with the disks Position are shown,

Fig. 8 is a view similar to Fig. 7, but with the pick-ups are shown in a loading position pressed against the discs, and

Fig. 9 is a perspective, on an enlarged scale View of two transducer head carriers, each for the inclusion of a pair of transducers is provided is.

As shown in the drawings for purposes of illustration, the invention is incorporated into a magnetic disk storage system, the most important parts of which are shown in FIG. The invention relates refers in principle to a method and apparatus for moving or "loading" a set of transmissions gerköpf 15 (which in Fig. 1 for the sake of clarity not shown, but shown instead in FIG. 7) onto the surface of rotating magnetic disks 16 in a magnetic disk storage system, i.e. the invention relates to the moving of the transducer heads in a working position on the discs. In Fig. 1 only part of a disk 16 is shown with dashed lines

5 0 9 8 17/1144

th lines indicated. In Figs. 7 and 8, however, are the transfer heads are each shown in an unloading and a loading position with respect to the disks 16.

Usually has a magnetic disk storage system a stack of various disks 16 coated with a magnetic material and rotatable a common axis 17 (Fig. 1) are mounted. The axis sits on a fixed frame 18 and is with a Drive motor (not shown) coupled. A group of pick-up heads 15 - one for each pick-up area the disk 16 - is held by freely projecting transducer head carriers 19, which in turn on a Holding carriage 20 are attached, which is movable with respect to the discs in the radial direction to the Pick-up heads in opposite, selected, concentric receiving areas on the discs in position bring to. It will be appreciated that the disks 16, although also shown mounted on a vertical axis can be oriented in a different way.

In the illustrated magnetic disk storage system, the transmission heads 15 can be moved radially as a single group and the elongated transfer head supports 19 are flat and essentially T-shaped. Each of the transmitter head supports 19 has an elongated central one Area 21 (see Fig. 9), which acts like a torsion bar and two in opposite directions having extending wings 22 and 23, by which a pair of the transmission heads 15 are carried. The whole T-shaped support 19 is made in one piece from a flexible resilient material, such as a flat spring steel. The elongated central region 21 of each carrier 19 is at its end rigidly on a vertically extending wall area

509817/1 UA

24A0822

24 (Fig. 1) of the holding carriage 20 attached in such a way that the central area 21 around a not inconsiderable Angle is twisted when the two wings 22 ,. and 23 aligned in a substantially horizontal position are. As can best be seen from FIG is, the transmitter head supports 19 are shown in the Embodiment attached to the wall 24 in pairs via beveled holding blocks 25. Each of the wings 22 and 23 carry a separate pick-up 15 (see 7 and 8) and the twisted or twisted central area 21 of each carrier 19 tries to create a transducer head up and the other down. Consequently, the transfer heads 15 are then against the Receiving surface of the adjacent discs 16 pressed when the transfer heads together with the carrier between the discs are positioned.

The holding carriage 20 (Fig. 1), from which the transfer heads 15 are carried over the carrier 19, is attached to rollers 26, which a movement of the Halteschlii; -tens along a guide plate 27 allow which is mounted on the frame 18 of the magnetic disk storage system. The guide plate 27 is with respect to the Disks 16 oriented in the radial direction. The holding carriage 20 is along the guide plate 27 by a straight actuator 28 moves, which moves the holding carriage 20 as a function of a control signal, which is preferably input from a computer (not shown) connected to the magnetic disk storage system is moved along the guide plate 27. The actuator 28 directs the "loading" of the transmitter heads 15 by moving the holding carriage 20 in a radial direction Direction inwards and then moves the transfer heads to selected positions in preparation for recording or retrieving information or recording areas corresponding to these positions.

509817 / 1U4

~ ¹² "24A0822

As is apparent from Fig. 9, the wings 22 and 23 of the carrier 19 tJbertragerkopf d ^ewe u ^s formed such that they ge a bent flap 31 in the region of its free end and include, at the holding block 25 nearest corner.

Each tab 31 forms a control surface which, when the carriers 19 are arranged between the discs 16, become incline outwardly in an axial sense from their corresponding disc surface and in a radial one Sense, based on the disk axis. These control surfaces formed by the tabs 31 on the transmitter head support are engageable with corresponding control surfaces 32 (Fig. 1) on a set of Control elements 33 (FIG. 1) which are held in a vertical arrangement by a control tower 34 (FIG. 1). Each control element 33 is aligned with one of the tabs 31 of the carrier 19, with relative movement of the carrier 19 radially outwards and in the direction of the control tower 34- causes the tabs 31 of the carrier 19 come into engagement with corresponding control elements 33 and thereby twist the carrier 19 further and at the same time the transfer heads 15 for the purpose of withdrawing the disks 16 from the Lift the disc surface into a position as shown in FIG. 7.

Similarly, a relative movement of the carrier 19 in the radial direction inwards and away from the Controls 33 causes the carrier 19 to disengage get with the controls and the transfer heads 15 again against the surface of the discs 16, as shown in Fig. 8, can be pressed. If the magnetic disk storage system is put into operation for the first time, so the transfer heads 15 are on the surface of the disks 16 by moving the holding slit

509817/1144

at least 20 and the pick-ups radially inward for disengagement the carrier 19 towards the control elements 33 lowered. Before an air cushion builds up between the transfer heads 15 and the disks 16, there is a direct contact between these parts takes place, albeit also due to the resulting disc wear the abrasion can be limited to an area outside the outermost receiving area. The usable recording area is in any case significantly reduced and increasing contamination of the pick-ups and others important parts possible. In addition, there is a related problem relating to disk damage, which can result from a failure of the power supply, which can result in a retraction of the transfer heads 15 prevented before they touch the disks 16.

In accordance with the present invention is the Control tower 34- from which the control elements 33 are carried are set up for radial movement in a direction parallel to the movement device of the holding slide 20, whereby the transfer heads 15 for "distribution of wear over a larger surface area with a sufficient radial velocity also in a substantially within the disc circumference lying position can be lowered. The device according to the invention comprises a mechanical one Link 35 for proper and adequate moving of the control tower 34- in connection with the continuous Inward movement of the holding carriage 20. The mechanical connection 35 operates such that the Control tower 34 - keeping pace with the holding carriage 20 is first moved inward so that the control elements 33 make contact of the transfer heads with the disk prevent and then be moved outwards when the lowering position for the pick-ups is reached. Of the

509817/1144

Holding carriage 20 continues its inward movement and so do the wings 22 and 23 of the transfer head carrier 19 slide down from their associated control elements 33 and bring the transducer heads 15 into contact with them of the disk 16. As will be described in detail below, the mechanical connection 35 is also reversed Sequence can be moved in order to lift the transfer heads 15 from the disks 16. This order can caused by an interruption of the electrical power supply to the magnetic disk storage system.

It is evident that the control tower 34 is for movement can be guided and driven in the radial direction in any suitable manner. In the case of the in In any case, the embodiment shown in FIG. 1 is the control tower 34 - which is approximately a right-angled, in a vertical plane is oriented frame, which has no bottom, but a horizontal upper leg 36 and has two vertical legs 37 connected to the upper leg - of two after supported outwardly and downwardly by feet 38 extending from the vertical legs of the tower. Own the feet 38 in the area of their lower ends bearing bushes 39, which are slidable on corresponding guide rods 41 are arranged rigidly on the frame 18 on opposite sides Sides of the guide plate 27 are attached. Because of this, the control tower spans 34 den Holding carriage 20 and the guide plate 27, whereby it can be moved in the radial direction independently of the holding carriage is.

The movement caused by the mechanical connection 35 of the control tower 34- is shown in detail in Figs 5, in which, for the sake of clarity, only one transfer head carrier 19, a pair of

509817/1144

24A0822

Controls 30 and a disc 16 are shown. The mechanical connection 35 comprises a .verschiebbaren Block 45 of approximately rectangular shape, which is displaceable is arranged on one or more rods 46, which are rigidly attached to the frame 18 of the magnetic disk storage system are attached and 'the sliding block a longitudinal movement in a direction parallel to Allow longitudinal movement of the holding carriage 20 and the control tower 34.

As shown in Fig. 1, the slidable block 45 is below and in the region of one side of the guide plate 27 arranged. A vertically extending pen known as transfer link 47, is rigid on the surface of the block attached approximately in its center. The transmission member 47 protrudes upwards into the area the inside of the holding carriage 20, for example between the holding carriage and the disks 16, so that the holding carriage comes to rest on the transmission member 47 when it moves inward. The transmission link '47 provides an indirect mechanical connection between the holding carriage 20 and the sliding one Block 45 represents, for example, an inward movement of the holding carriage 20 is transferred through the transfer member 47 to the block 45 while an outward movement of the holding carriage is not transferred to the block. It is also evident that an outward movement of the block 45 every movement and will drive the holding carriage 20 radially outward. This way of working, which in the will be described in detail below, forms the basis for an automatic retraction of the pick-ups 15.

Recessed in the side surface 49 (see Fig. 2 to 5) of the sliding block 45 is a specially shaped one

509817/1 U4.

2UQ822

Control groove 48, which in the present exemplary embodiment has a uniform depth of approximately 6.35 mm (0.25 inch) and a uniform width of approximately 12.7 mm (0.5 inch). 48 from its inner end 51 near the bottom of the side surface 49 has the control groove a relatively steeply rising portion 52 with a vertical rise of about 19 O ₅ mm (0.75 inch) over a horizontal distance of about 25.4 mm (1.0 inch), then a short horizontal portion 53 near the top of the side surface 49 and a longer portion 54 which gradually descends over about half the vertical rise of the steeply sloping portion 52 of the control groove. An L-shaped lever 56 has a central pivot point 57, a longer arm 58 about 41.3 mm (1 5/8 inches) in length, and a shorter arm 59 about 31.7 mm (1 1/4 inch) in length. The L-shaped lever 56 is attached with its pivot point 57 to the frame 18 of the magnetic disk storage system, the lever being articulated in a vertical plane parallel to the side face 49 of the displaceable block 45 provided with the control groove 48. The free end of the short arm 59 of the L-shaped lever 56 is provided with a roller 51 which has a diameter which is dimensioned for placement of the roller in the control groove 48 and allows the roller to move freely along the length of the control groove can move. It should be emphasized that the exact dimensions of the control groove 48 and L-shaped lever 56 are not critical, but that the relative dimensions should be such that inward movement of the support carriage 20 and the sliding block 45 results in approximately the same inward movement of the control tower 34 should lead until the lowering point for the pick-ups 15 is reached.

When the block 45 moves inward, the roller 51 slides along the control groove 48 and gives the free Only the end of the short arm 59 of the L-shaped lever 56

509817/1144

~ ¹⁷ ~ 24408

an upward movement and then a downward movement. This produces a corresponding inward and then outward movement of the long arm 58 of the lever 56, DES ^v sen free end with a second roller 62 is provided, which similarly to the first roller in a vertical groove 63 of a downwardly extending strut 64 is guided, which is rigidly attached to one of the feet 38 (Figure 1) of the control tower 34- v

A coil spring 66 (Figs. 2 to 5) is between the Block 45 and a part of the frame 18 attached and acts on the block 4-5 with an upwardly directed Force. During the transfer head lowering process, the holding carriage 20 moves the block 45 inwardly over the transfer link 47 and against the force of the spring 66. A solenoid-operated locking device 67 in the area of the inner end of block 45 locks the block in the innermost position of its way as long as the magnet 68 is supplied with current. The locking device 67 can use any conventional locking mechanism. In the present preferred embodiment however, the locking device comprises a pivotable locking lever 69 which is connected to a roller

70 is equipped, which of the by the magnet over the locking lever 69 acting force, as shown in FIGS. 2 to 5, pushed upwards will. At the front end of the block 45 is a protrusion

71 attached, which with a downward-facing, aligned with the roller 7 ° of the locking lever, Latch 72 is equipped. When the block 45 is its Reached the innermost position, the roller 70 is behind the Latch 72 out and there by the force of the magnet held. This will attach the block to one through the spring 66 is inhibited until the current through the electromagnet is interrupted and the

509817/1144

Locking lever 69 falls out of the area of the locking lug by its own weight.

In the course of the placement of the head illustrated in FIGS. 2 to 5, the holding carriage 20 is turned off its fully retracted position shown in Fig. 2 by the linear actuator 28 is moved inward and thus pushes the displaceable block 45 forward through the transmission member 47 arranged on the block. The movement of the slidable block 45 displaces the L-shaped lever 56 in counterclockwise rotation (as shown in the figures), since the end of the shorter arm 59 of the lever is in the steeply sloping area 52 of the control unit 48 is performed upwards. The tax groove 48 and the L-shaped lever 56 are proportioned in such a way that that as long as the steeply rising area 52 measure becomes, the end of the longer arm 58 about the same amount moves inwardly as block 45. As a result, control tower 34 is moved inwardly by about the same amount as that Holding carriage 20 and the pick-up heads I5 are off for this reason still resting on the control elements 33 (as shown in FIG. 4), between the discs pushed in.

As soon as the horizontal region 53 of the control groove 48 is reached (as shown in FIG. 4), the rotary movement ends of the L-shaped lever 56 for a moment. As a result, the control tower 34 also stops moving inward and thus allows the transducer head carrier 1% in its To continue inward movement and to drag down the controls 33, placing the heads 15 on the disks 16 touches down. The block 45 moves as a result of the continuous inward movement of the holding carriage 20 with his Inward movement continues and the downward portion 54 of the control groove 48 reverses the direction of rotation of the L-shaped

509817/1 UA

Lever 56 around. As a result, the control tower becomes 34- again moved outward until the position shown in Fig. 5 is reached. In this position, the control elements 33 are out of the area of the edges of the disks 16 withdrawn, the transfer heads 15 have reached their position just behind the innermost receiving area and the block 4-5 is secured by the latch 67.

After the heads 50 have been set down and the Blocks 45, the magnetic disk storage system is ready for normal operation and the heads can positioned by linear actuator 28 on any desired track. It's obvious, in particular from Fig. 5 that the heads I5 everywhere from the innermost to the outermost track on the disks 16 can be moved without the transducer head carrier 19 the now withdrawn control elements 33 touch and without the holding carriage 20 touching the transfer member 47 on the block 4-5. ■

From the drawings, in particular FIGS. 2 to 5i in detail, it can be seen that the mechanical connection 35 can also work in reverse order * to convert the Lift and retract heads as soon as locking device 67 is released. The electromagnet 68 is only energized as long as power is available to drive the disks 16, and if the power is available If it does not occur unexpectedly or is switched off, the locking device 67 is released and the block 4-5 urged outward by spring 66 which in turn causes inward and then outward movement of the control tower 3 ^ · causes. Regardless of where the heads go to the time that the latch 67 is released, the outward movement of the block 45 is transferred to the holding carriage 20, so-

509817/1 1 44

soon the upwardly extending transmission link 4-7 touches the holding carriage 20 on the block. Consequently, the heads 15 are either at their point of support or at that point lifted further out from the point of support and the raised heads 15 and controls 33 become their fully retracted positions according to FIG. 2, which are also interrupted in FIG. 5 Lines indicated, withdrawn. The above retraction sequence therefore works to the pick-up heads 15 reliably take off and withdraw in the event of a power failure before a due to the slowing down of the Disc speed caused damage can occur.

In the preferred exemplary embodiment, the control elements 33, as shown in FIG. 6, are provided in pairs. The control elements of each pair protrude from a common body region 73 and form a slot 74 between them in order to supply one of the disks 16 while the control elements 33 are moved inwards to place the heads 15 on. The end of the control element 33 comprises the ramp-like surface 32 which interacts with the control surface 31 (FIG. 4) of the transmitter head carrier 19. The common body regions 73 in turn have bores 73 through which they are attached to the vertical legs 37 of the control tower 34 (see FIG. 1).

From the foregoing it will be seen that the present invention is a significantly improved process and a significantly improved apparatus for placing transducer heads 15 on the surface of Comprises disks 16, compared with devices that were previously suitable for this purpose. To put it more concretely: the present one The invention essentially reduces the disk damage caused by head-on processes.

509817 / 1U4

ben wear and discloses a safety mechanism against failure to safely and reliably retract the heads 50 and controls 35 in the In the event of a power failure. Although only; a particular embodiment of the invention is shown in detail and has been described, it goes without saying that a wide variety of modifications are possible without the To leave the scope and scope of the invention.

509817/1144

Claims (1)

Claims i) Device for moving pick-ups in a rotating working position adjacent to the receiving surface, characterized by Transfer head support devices (19) for supporting the transfer heads (15) for movement over the Receiving surface, first mechanical devices for moving the transfer heads (15) over the surface, second mechanical devices connecting these transducer head support devices (19) and the first mechanical devices and working to be the first mechanical devices set in motion, whereby the transmission heads (15) in their substantially inward of the surface periphery arranged working position can be moved. 2. Device for moving transfer heads in a working position in a disk storage device adjacent to the surfaces of rotating disks, characterized by transmission head support devices (19) for supporting the transmission heads (15). for a movement over the disc surface, first mechanical devices for moving the transfer heads (15) over the disc surface and second mechanical devices connecting these transfer head support devices (19) and the first mechanical devices, setting them in motion, whereby the transfer heads (15) are moved into their working position arranged substantially inward of the surface periphery. 3. Apparatus according to claim 2, characterized in that the pick-up carrier device , lines (19) for driving the pick-ups (I5) against 509817/1144 the corresponding disk surface comprise elastic devices, and that the first mechanical Device is to be arranged in such a way that the elastic means and thereby the transfer heads of retractable from their contact with the disc surface are 4. Apparatus according to claim 2, g e k e η η records by locking means (67) for releasably holding the first mechanical Facilities in a retracted position after the transfer heads (15) are in their working position towards the disc surface have reached, and elastic means in response to the Release of the locking devices to the second to drive mechanical devices working in reverse order and thereby the pick-ups (15) to lift off the washers (16). 5. Apparatus according to claim 4-, characterized in that the locking device (67) works electrically and in the event of interruption of the releases electrical power to the disk storage device. 6. Device for automatic lifting and retraction of pick-ups from rotating disks in a disk storage system in the event of an interruption of the electrical current supplied to the system, characterized by mechanical devices for lifting and retracting the pick-ups (15) i elastic devices connected to urge these mechanical devices into operation, and electromechanical devices Means for holding these mechanical devices in a rest position and releasing them of these mechanical devices in case of interruption of electricity. 509817/1 UA 7. Apparatus according to claim 6, characterized in that the mechanical means have a connection include, which also in the opposite direction for conveying and lowering the transfer heads (15) the discs (16) work. 8. Device for moving transfer heads in a working position in the area of the surface of the rotating Disks in a disk storage device, characterized by transfer head support devices (19) for supporting the transducer heads for movement in a substantially radial direction Control devices for holding back, movable over the disk surface, parallel to this radial direction of the transfer heads (15) against contact with the disk surface and for controlling the transfer heads toward the disc surface in response to inward movement of the transducer support means and away from the controls, and one of the pick-up supports and mechanical connection connecting the control devices for moving the Control devices inward, then outward due to a continuous inward movement of these transducer head support devices, in order to steer the transmission heads towards the disk surface in points which are essentially are within their scope. 9 · Device according to claim 8, characterized in that the transmission head support devices (19) elastic devices for driving the transfer heads (15) onto the associated disk surface and that the control devices are to be arranged to retain the elastic devices and thus to restrain the transducer heads from contacting the disc surface. 509817 / 1U4 10. The device according to claim 8, marked is characterized by locking devices (67) for releasably fixing these control devices in a retracted one of the disk surfaces adjacent position after the pickups (15) have reached their working position, and resilient means in response to the release of these locking means, driving this mechanical connection in the opposite direction in order to retract the transmission heads (15) by moving the transducer head carriers (19) outward and simultaneously inward and then moving the controls outward. 11. The device according to claim 10, characterized _r that said locking means (67) operates electrically and in the case of interruption releases the electric current to the disk storage device. 12. Device for placing a large number of transducers on corresponding surfaces of a * stack of magnetic disks, which can be rotated in a Frame of a disk storage device are arranged, characterized by a for a holding slide mounted on a frame (18) so that it can move radially with respect to the disks (16) (20), an actuator (28) for the radial positioning of this holding carriage (20), elastic transmission head support (19) for carrying the transfer heads (15) and urging them towards the disc surfaces, wherein the elastic transmission head support (19) fixed ends which are attached to the "holding carriage (20) are attached, and have free ends which extend radially against the discs and the transmission 509817/1144 carry gerkeads (15) for insertion between adjacent panes (16), slidable on the frame (18) mounted control devices for a radial movement parallel to the movement of the holding carriage (20) to control the transmission head carrier (19) between one of the transmission heads (15) clear of the disk surfaces holding, lifted position and a put on Position in which the transmission heads (15) are pressed against the disk surfaces, while these control devices for the transmitter head carrier are moved between preselected positions "with respect to the holding carriage (20), and the holding carriage (20) and the control devices connecting mechanical connecting devices (35) »comprising a rotatable attached to the frame (18) and with the control elements (33) for the IJbertragerkopfträper (19) in connection stationary lever (56), and mechanical devices responsive to the inward movement of the holding carriage for setting the lever (56) in rotation, in order to retract the control elements (33) of the transmission head carrier (19) of the transfer heads (15) to move inwards between the discs in the lifted position, then outwards to move to place the transfer heads (15) on the discs (16). 13. The apparatus of claim 12, marked characterized by an electrically operating locking device (67) for releasably holding the mechanical connection (35) and the control devices for the transmitter head support (19) opposite a further movement after the transfer heads (15) have been set down and the control devices have been withdrawn for the transmitter head carrier (19), with this mechanical Link (35) connected elastic means (66) for driving this mechanical link in a reverse direction, which in the case 509817/1144 an interruption of the current to the solenoid operated Locking device (67) the spring (66) the holding carriage (20) outwards and the control devices for the transfer head support (16) moved inwards to the Lifting the transfer heads (15) from the disks (16), then moved outwards with the holding carriage (20) in order to withdraw the lifted transfer head (15). Device according to claim 13, characterized in that the inward movement of the The mechanical connection (35) corresponding to the holding slide (20) comprises a slidably mounted block (45), which is operatively connected to the lever (56) and rotates it accordingly Control groove (4-8) has that the elastic means (66) for driving the block. (45) outwards and for lifting and retracting the transfer heads (15) is provided, and that the electrically operating Locking means (67) prevent the block (45) from further movement from an innermost position secures. - 15. Apparatus according to claim 12, characterized in that the elastic transmission head support (19) comprise a plurality of torsion bars, which a pair of oppositely arranged transducer heads (15) for retraction between two adjacent ones Wear washers (16). 16. The device according to claim 15 »characterized in that the control devices for the transfer head carrier (19) have a series of control elements (33) positioned to interact with the torsion bars in order to control the transfer heads (15) towards and away from the disk surfaces . 509817 / 1UA 17- Device for moving a plurality of transducer heads into a working position adjacent to the surfaces of a stack of spaced apart magnetic disks, which magnetic disks are rotatably arranged in a frame of a disk storage device, characterized by a slidable on a frame (18) next to a stack of disks arranged holding carriage (20) for a radial movement with respect to this, an actuator (28) for moving the holding carriage in the radial direction, a plurality of elastic, substantially T-shaped torsion bars, the fixed ends of which are attached to the holding carriage (20) and radially inwardly extending central areas (21) as well as adjoining pairs of wing-like areas (22) extending in opposite directions which carry pairs of transducer heads (15) for insertion between the disks (16), the torsion bars the transducer heads Every paa res pushing in different directions to corresponding, inwardly facing opposite sides of disk surfaces, a slidable with parallel for radial movement in a direction for moving the holding slide (20) on the frame (18) control tower (3 ⁷ +) mounted, a plurality of fixed control elements (33) connected to the control tower (34) and arranged for sliding contact with the wing-like areas (22) of the torsion bars to move the transfer heads (15) between a lifted position in which the transfer heads are withdrawn from contact with the disk surfaces, and in an installed position in which the transducer heads (15) are urged into contact with the disk surfaces, to control a substantially L-shaped lever (56) rotatably attached to the frame (18) at its central knee, one of which End in response to the rotary motion of the L- 50981.7 / 1 UA shaped lever with the control tower (34 ·) for its displacement is coupled, one on the frame for radial movement parallel to the movement of the holding. Slide (20) slidably mounted block (45), the Means for coupling together with the holding carriage (20) for its inward movement with the holding carriage and for guiding the other end of the L-shaped lever (56) has a control groove (4-8) to to rotate the L-shaped lever (56) first in one direction and then in the other direction, corresponding to the inward movement of the holding carriage (20) and the block (4-5) and thereby the control tower (34-) initially inward with the To move the holding carriage (20), then with the progressive inward movement of the holding carriage outwards / outwards move to move the pick-ups (15) to their remote position and to retract the control tower (34), Locking devices (67) for releasably securing the block (4-5) against another Movement after the pick-ups (15) are in their detached Position were moved and the holding carriage (20) has reached its innermost position, the Holding carriage (20) then independently of the block (4-5) and the control tower (34-) is movable to the transfer heads (15) to be placed in selected recording tracks on the pane surfaces. 18. The device according to claim 17, g e k e η η is characterized by a in the event of an interruption of the current, the locking device (67) releasing electromagnet (68) and one with the sliding ■ bar block (4-5) connected spring (66) through which-this in the event of a release by the locking device (67) is moved outwards to the holding carriage (20) outward and the control tower (34 ·) inward to move the pick-up heads (15) in .he lifted Position, then move outward to retract the pick-ups (15) and controls (33). 509817/1 1U 19 · Procedure for placing pick-ups on the Surfaces of rotating disks in a disk storage system, marked by. the steps: Advance the pick-ups over, but not in Contact with the disc surfaces, Moving the pick-ups onto the assigned disk surfaces at contact points essentially within the disc periphery, and Continue advancing the transducers over the disc surfaces to disperse any surface debris over a large surface area. 20. The method according to claim 19, characterized in that in the step of advancing the transducer heads inwardly in a generally radial direction with respect to the disks be advanced. 21. The method according to claim 19, characterized in that the step of moving the transfer heads towards the disc surfaces by the movement of the control elements in relation to the transfer heads is effected. 22. Method for moving transducer heads into one of the surfaces of corresponding coaxial surfaces mounted disks adjacent working position, for use in a disk storage device, characterized by the steps: Insertion of the transmission heads on support devices in a radial direction between the disk surfaces, but not in contact with them, 50981 7/1 1 A4 Simultaneous insertion of control elements between the disk surfaces with the transfer heads to the To hold back heads against a contact with the disk surfaces, Reverse the direction of movement of these controls once a touchdown position essentially within the Disc circumference is reached in order to control the transducer heads in contact with the disc surfaces while the transducer heads continue with their inward movement, and ' Retracting the controls from between the washers to position the pick-ups on each one to enable the desired radial area of the disks without touching the controls again. 25. The method according to claim 22, characterized by the step of releasably locking the controls in a retracted position after Step of withdrawal. 24. Automatic lifting and retracting procedure of transfer heads of rotating disks in one Disk storage system in the event of an interruption in the Electric power supplied to the system, characterized by the steps: Release of stored in elastic devices Energy in case of interruption of electricity, Lifting and retraction of the transducers from the disks by exclusively using the elastic ones Devices released energy operated mechanical Facilities. 509817 / 11U 25. The method according to claim 24, characterized in that the step of lifting and retracting of the transfer heads, the retraction of the same from the discs with the movable control devices includes. 26. Procedure for the automatic retraction of pick-ups, for use in a disk storage device in the event of an interruption of the electrical energy, from the surfaces of the stack of disks of adjacent working positions, indicated by the steps: Retraction of the pick-ups radially outwards on support devices, which use energy stored in elastic devices, Simultaneous insertion of a large number of control elements, which are also in these elastic devices Use stored energy, between the disc surfaces, to contact the pick-up support means to control the pick-ups from the disk surfaces, and Reverse the direction of movement of the controls and retract both the controls and the transfer heads to a retracted position. 27. The method according to claim 26, characterized in that the method steps by release a locking device can be triggered in the event of an interruption of the electrical current to the device, and that the elastic device is a spring, 509817/1 Blank page