DE3049955A1 - TRANSDUCERS AND SUPPORTING ARM ASSEMBLY FOR DOUBLE SIDED FLOPPY DISK - Google Patents

Description

30A9955

description

The present invention relates generally to magnetic recording devices and, more particularly, to improvements in support structures. Holding structures for electromagnetic transducers of the type that are used in particular in connection with a magnetic disk data storage device system can be used to transfer data between the transducer and a flexible magnetic disk. .---

All magnetic data storage systems have a magnetic

Data storage medium for storing data in magnetic form: and an electromagnetic transducer is required which has one or more 'heads' for performing a 'reading' and / or 'writing' of data in magnetic form corresponding to the or;. to the recording medium has. While with such magnetic data storage systems Data recording media of various configurations (such as tapes, fixed disks, and drums), the so-called 'floppy disk' has recently had wide application found, not just in program storage and access applications, but a number of various data access, storage and control applications. The 'floppy disk' medium is a thin, generally planar, flexible one or flexible magnetic disc, which has magnetically sensitive surfaces and in a known manner with a speed of rotates about 360 RPM in a protective sheath or jacket cover. The data transfer to and from the floppy disk is achieved by one or more built-in electromagnetic heads that together form a transducer. The converter (or the Transducers) communicate with one or both surfaces of the floppy disk via window openings in the protective sleeve.

The state of the art includes a number of different transducer structures, which can be used for communication with floppy disks. In general, those parts of such transducers differ, those for electromagnetic transmission to and from the floppy disk are not responsible for their basic components

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30A9955

significant from each other. Each of such transducers basically comprises a plurality of magnetic core members which relate to one another prepositioned, .-. '. ·. attached to one another and connected to one another with one or more coils to form an operational electromagnetic transducer. For the most part, such transducers, which in Verbin-aür'j used with data transfer to and from a floppy disk - put a single read / write channel head on, and they can

typically also include an erase head. Thisj. .

generally has a plurality of arcing cores for trimming "-. or matching a 'track' from onto the surface of the floppy disk written information and to delete a pair before: .-. Protective tape areas on each side of the trimmed track. For' the purpose of the present invention is the particular structural details and the relative placement of the electromagnetic Components that together form the various head sections of an electromagnetic transducer are not important in themselves, because the present invention works equally well with any electromagnetic working 'type' of such transducers and component head structures can be used, be it multiple or single, erase, read, write or combined read / write heads.

The unilateral systems introduced initially are electromagnetic Data transfer between the converter and the floppy disk at a time with respect to only one side of the Floppy disk possible. The efficiency is significantly improved in a double-sided system. In such a system is simultaneous data transfer is possible on both sides of the floppy disk. This is done by using a pair of generally opposing Enables transducers that are operationally appropriately arranged to accommodate the floppy disk therebetween, so that both surfaces of the floppy disk are detected at the same time.

In known single-sided and double-sided floppy disk systems, their corresponding converters are typically 'assemblies'

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mounted on a movable carriage or carriage structure which is switched radially with respect to a floppy disk in a relatively fixed position. The movement of the carriage structure enables the transducer or transducers carried thereby to access various desired circular tracks ¹ which are arranged at different radial positions on the magnetizable surface of the floppy disk. The positioning of the movable slit-Uengebildes must be aligned and controlled with respect to the nominal disk plane, this disk plane being defined as that E] Se.ne in which during the operational rotation of the ... 'disk a surface of a floppy disk Disk is nominally. Since a floppy disk has two data transfer surfaces separated by the thickness of the floppy disk, one is double-sided. · Total system with two nominal target levels, which are generally referred to as air -: ..:., Nominal 'upper' and 'lower ¹ target levels. In an optimal operating system, with the exception of that part of the floppy disk which is detected by the transducers, it is desirable for the two without deficiencies or imperfections therein, such as impact or deformation, caused for example by deficiencies in the disc itself, by the flexible nature of the disc or by the movement transmitted to the disc by the device rotating the disc.

Known floppy disk data transfer systems have pertained to the design of their transducer support structures, which are attached to the movable carriage or carriage. At early or old single-sided floppy disk systems, the converter generally had a curved surface for operational intervention with the floppy disk and for penetration into and above the nominal disk plane of the data transmission surface in engagement. The transducer was generally fixedly attached to the movable carriage. An articulated arm that carried a pressure pad was on pivotally mounted on the carriage to allow disc entry. The arm was spring loaded so that the

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" ¹ ^" 3Q49955

gene pressure pad engaged the disc at a location directly opposite the transducer head and exerted a known force on the disc, thereby adjusting the compliant disc to intimate engagement with the domed transducer head. This old one-sided system had a limited data transmission capacity, since at one point in time a data transmission, χ-άτς to one side of the disk could be reached, so that the S'yr !. star was relatively slow. " ^: "

Requirements for a larger capacity and for a schneiIeCi <> * o Data access and faster data transfer led to reciprocal issues Floppy disk data transfer systems in which - simultaneously transfer data with both sides of a floppy disk ' could become. As stated above, such sys]. "Eii. \ J generally a pair of transducers respectively mounted to face opposite surfaces or sides of the floppy disk to come into operation, in general to each other opposite positional relationship. The opposing transducers are generally positioned so that their respective head "gaps" are slightly radially offset with respect to one another, about a magnetic one To reduce flux interaction between the transducers.

In such known double-sided floppy disk data transmission systems can be the upper and lower recording areas periodically move the floppy disk out of its respective upper and lower nominal disk planes. Such deviations could, for example, be caused by warped panes or excessive windshield impact can be justified (i.e. disturbances in the disc surfaces when rotating the disc). It was therefore assumed that it was arranged for the opposite Converter heads would be desirable to mount these oppositely movable so that the transducer heads the actual Path of the floppy disk recording surfaces passing between them could follow if a deviation from the upper and lower nominal slice planes. Accordingly, various transducer mounting devices have been made in the prior art proposed to accommodate such variations in floppy disk operating movement. - 13 -

Such a mounting configuration, disclosed in U.S. Patent Re. 29,380, reissue Aug. 30, 1977, illustrates a method of attaching a pair of transducer slide heads or slide heads in opposite positional relationship on a pair of fixed support arms, which under the effect ei.nes solenoids are movable, namely in a 'loading' mode -, to the disc as well as in engagement therewith and during an 'Ent' -; * t. load 'operation away from the disk as well as from an intervention hl'iir-

init. The support arms arrive with stop links

to limit a carriage engaged to the closing distance therebetween up "a fixed predetermined value The gegenüberlie ^r -. .. '' constricting transducer heads are liegen- by a pair of among them, ge-- the coil springs in a forced engagement with the pulley - * - presses to record the floppy disk in between.;

As disclosed in co-pending U.S. patent application 'Z-Axis Flexural Suspension Device ¹ by Leonard Kronfeld, Ser. No. 82,009, filed October 5, 1979 and assigned to the assignee of the present application is discussed in more detail, such a structure suffers from certain disadvantages in terms of a lack of motion sensitivity in following deflections of the floppy disk. This leads to data transmission errors caused by shifting the transducer relative to the recording tracks, to a small or slow damping response after a loading process and to a reduced contact between the transducer heads and the recording surfaces of the floppy disk.

Another change to a dual transducer mounting configuration is described in U.S. Patent 4,089,029, Issued May 9, 1978. This structure has a pair of long cantilevers The transducers attached to the support arms are mechanically compressed under spring tension, with each of the oppositely arranged transducer on a gimbal structure (gimbal structure) is attached independently, which is a universal Swivel movement of the corresponding transducer head assemblies allowed. The surfaces of the engaging the disc

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Transducer heads are generally planar. The articulated transducer support arms are interlocked so that movement of such arm, which tends to lift one of the transducers out of engagement with the surface of the disc, also results in movement of the second arm about the second transducer from the opposite surface to move the disc, namely to load and Er> t ~. loading the disk into and out of the operating position. Each Arnü .. is with a predetermined force against its corresponding Se ^"i: th of the disk is pressed, and there is a tendency to maintain speaking detected disc surface an intimate --- contact between the transducer and carried by the arm of its pYiZ- The composite. The floppy disk takes up the structure between the opposite transducers with a relatively weak loading force of 6 to 7 grams, which tends to increase the instability *. ··· While the double gimbal structure is designed so that a fast If response movement of the transducer heads is possible to adjust or compensate for perturbations in disk movement from the nominal disk planes, such transducer tracking motions result in an increase in displacement errors, as detailed in the above-referenced copending application. The system is very complicated and expensive to build and manufacture.

A relatively recent or new configuration of a double-sided Floppy disk data transfer system is disclosed in U.S. Patent 4,151,573, issued April 24, 1979. This structure is designed in such a way that there is good contact between the transducer disk surfaces improved and some of the disadvantages of the well-known double-gimbal transducer support structure reduced. This structure uses an asymmetrical, transducer support structure, that has a first or lower transducer with a planar transducer core surface that is immovably fixed (such as in earlier unilateral transmission systems). A second (upper) The transducer is attached to a universally movable gimbal structure and is supported by a spring-loaded arm can be swiveled in the vicinity of operation with the fixed lower transducer head, so that the floppy disk is held in between with a predetermined force.

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gain weight. The lower transducer head structure is (in terms of surface area) relatively larger than the upper transducer head, so that it is considerably larger than the outline dimensions of the upper Nuclear converter extends. The core surface of the lower transducer is mounted so that it is in the nominal disk plane a loaded or inserted floppy disk penetrates excessively ^ whereby the upper wall supported by the cardanic support structure More than a pressure pad for the lower fixed transducer head. Conversely, the lower fixed transducer head works as a. Pressure pad for the upper transducer core. While some of the shift and offset tracking errors are reduced, the, - above double cardanic structures described are peculiar to ze.jjgt this structure still has a certain incorrect positioning of the Wäad ^ * lers in relation to the recording tracks of the underside upper - * - area of the floppy disk due to the fixed property of the lower transducer head. The one corresponding to this patent The construction also has the disadvantage of excessive wear and tear on the floppy disk as a result of the 'hard' landing. of the upper converter during system loading. These particular disadvantages of the prior art are overcome by those described in the above copending application has overcome the improvement disclosed and claimed.

These and other problems in the prior art will become overcome by the improved transducers and support arm assembly of the present invention. According to one embodiment According to the invention, a transducer arm is provided for use with a double-sided floppy disk data recording system. The arm includes an elongated body portion which has first and second opposing sides with an opening extends through the body near the first end of the arm. At the second end of the arm is a hinge for connecting to one Support member of a transducer assembly is provided. A substantially planar flexure that has an open central area and is shaped to provide a pivotal gimballing movement of the central area around one another to allow right-angled axes normally found in the

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30A9955

Lying plane of the limb is attached to the first end of the arm. A transducer is attached to the flexure. A cover, which in the preferred embodiment is a snap-in insert, is provided for closing the opening in the arm. The cover contains a flap, which is appropriately positioned to protrude laterally over the arm, and an insertable 3 * l ~. bar pivot member positioned to raf into the opening. gen and to come into engagement with the bending member at the intersection of the gimbal " ^: 'axes. According to a preferred embodiment." .- form of the invention, the pivot member is an adjustable locking "";'

According to another embodiment of the invention, a terminal board is fixed adjacent to the central section of the flexible member and the official transducer. Conduit means, preferably a flexible strip, positioned along the arm in a recess therein connects a cable to the terminal board which includes terminal eyelets extending through the conductors of the flexible strip and into the terminal board. Windings from the coils of the magnetic transducers can be looped around the connection lugs, and the wires (connection lugs) and the flexible strip can be soldered to the connection lugs at the same time.

According to another embodiment of the invention, the joint provided on the second end of the arm can be a leaf spring joint and means for clamping the sheet. The clamping means have a plurality of intersecting passages, so that a conductor cable coming from the transducer at the end of the arm passes through one of the passages for connection to a external system can be directed. A bias spring for the arm is set over the clamping means to see cover cutting passages and continue to hold the cable in place.

According to another embodiment of the invention, the body portion has of the transducer arm a cutout or recessed

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rich in the flat underside of that remote from the transducer End of arm adjacent. A blade hinge and a pair of clamp plates are provided. The clamps come with one end of the leaf hinge connected / preferably by spot welding, and the layer structure is connected to the arm, one of the

Clamping plates in the recess area of the underside of the arm- ^:

fits. The clamping plates have opposite, the leaf hinge.:, touching straight edges and work together to determine a bending axis or axis of rotation for the leaf hinge. Preferably is. the outer surface of the lower clamp plate is generally coplanor:; or even with the generally flat underside surface of the arm. 1 : :

According to another embodiment of the invention is an improved magnetic transducer for use in a magnetic disk data storage system intended. The transducer contains a transducer body made up of bonded core and ceramic pieces and is formed with a planar face in which the recording or read / write gap is located. In the In use, the transducer is positioned so that the planar face is for data transfer operations with the disk recording medium is in contact. In the case of a double-sided floppy disk recording system, a pair of such converters is used, and means are provided for supporting or holding the transducers and for moving them into an operational data transmission position in which the end faces of the transducers are in mutual contact with the disk recording medium at opposite Pages of this are located.

Each transducer is along that adjacent the planar face Edges or edges beveled. In addition, the corners formed by the intersections of these adjoining edges are beveled and preferably provided with a tapered area chamfer that uniformly extends into the edge chamfer on each side the corner passes. In addition, all edge and corner bevels are uniformly adapted or rounded to remove surface irregularities in the planar end face of the transducer

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to avoid. By chamfering the corners, undesirable stress concentrations leading to wear are avoided, in the event of a corner of the transducer body engaging the recording medium during transducer loading or Discharge on the medium.

In the case of a double-sided system in which the first transducer "· an a loading arm is attached, which is pivoted away from the second converter in order to insert or remove a floppy disk. remote, and which for a data transfer operation with the 1 Disc is brought into contact, the chamfers on the first transducer are preferably about 15 degrees. The bevels. · -.-. at the second transducer are preferably about 30 degrees to '

Inserting and removing the floppy disk aid where it is -

is required to do this during insertion or removal ^ to capture and move across the transducer.

In accordance with the present invention is an improved magnetic transducer structure provided for a magnetic disk data storage system which has a transducer with a planar face for contacting the Recording disk during data transfer operations and a housing contains the transducer with its end face protruding therefrom in the operational data transmission position for operational touching of the disk recording medium to position. A guide ramp is arranged on the housing or is preferably designed to be connected therewith. the Ramp is positioned adjacent the transducer and slopes down from the housing to the transducer to guide the edge of a recording disc over the face of the transducer when the disc is used in the converter structure. A second ramp can be provided on the opposite side of the transducer on the housing in order to guide the protective sleeve of a floppy disk over the converter when it is removed from the converter assembly. Preferably located bevels in the edges of the transducer adjacent the ramp to guide the disc recording media the transducer continues to close during the insertion or removal vox support.

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A brief description of the drawings follows. In these show:

Figure 1 -

Figure 2 -

Figure 3 -

Figure 4 -

Figure 5 -

Figure 6 -

Figure 7 -

Figure 8 -

Figure 9 -

Figure 10
Figure 11
Figure 12

Figure 13 -

Figure 4 is a perspective view of a magnetic transducer assembly according to the present invention, with parts broken away for clarity, an exploded view of part of Figure 1 on a larger scale, ". '." ..

a section along the line 3-3 of Figure 1,. " a fragmentary view similar to Figure 3 on a larger scale, - *

. a used in the transducer assembly of Figure 1 bending - * · member, ^'; .;

- a flexible cable used in the structure, '.- ■. "

- in a view from below, one used in the structure _: ----- snap-in insert,

- a fragmentary section along the line 8-8 Figure 1,

a fragmentary view similar to Figure 4, but on an even larger scale with parts omitted or are shown in section,

- a first transducer in an enlarged view from below,

- a second converter in an enlarged plan view,

- In a greatly enlarged fragmentary detail view of part of the transducer from FIG Recording medium is omitted and a partially schematic view showing the The process of inserting a floppy disk into the transducer assembly.

Referring to Figure 1, there is shown a portion of a "floppy disk ¹ or 'floppy disk" inserted in a data transfer position with respect to a transducer assembly according to the present invention. The floppy disk comprises a thin, nominally planar disk 20 of flexible material, the surfaces of which are coated with a magnetizable material, and the disk 20 is enclosed in a protective sleeve 21. This has upper and lower radially aligned stretching

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Kende slots 22, which, as can also be seen from FIG is, extend between inner ends 23 and outer ends 24 to define transducer access areas for the surfaces of the disc. Conventional disk drive means (not shown) are provided to rotate the disk 20 in the shell 21, as indicated in FIG. 1 by an arrow 25 is. There is of course no rotation of the sheath 21, the suitable guide means (not shown) in place; what is well known is held.

A carriage or slide, generally designated 30, is provided for the support and movement of the transducers, as will be explained in more detail below. The slide 30 connects in the "." Practice with a lead screw or other positioning means, as is well known in the art, to move the carriage radially in the desired manner and to engage the transducers in desired tracks of a plurality of circular tracks recorded at different radial distances on disk 20. As more clearly seen in Figures 4 and 9, a pair of transducers 32 and 33 are supported by carriage 30 for engagement with the recording medium To simplify the present specification, the transducer 32 will be referred to as the "upper transducer ¹ or" head and the transducer 33 will be referred to as the "lower transducer ¹ or" head. However, the terms "upper" and "lower" are used for convenience only of identification and do not concern a necessary positional relationship because the head structure is also used in a floppy disk recording system could be installed, the orientation of which is upright or edge-wise or reversed from the spatial position shown in the figures or 'top down' or in any other desired manner.

The upper transducer 32 is connected to the carriage 30 by means of a support arm structure connected, which is described in more detail in this description. The top transducer and arm assembly can either in conjunction with an immovably fixed lower

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VJandler's disclosed in U.S. Patent 4,151,573 discussed above Type or preferably work with a transducer that has a Z-axis bend suspension or bearing according to the above identified, has simultaneously pending application.

Both in connection with a fixed transducer, as well as a _V: converter with a Z-axis suspension or storage, there is, - · function of the upper transducer Armaufbaues therein, the transducer in \ a suitably aligned, opposed engaging the

To hold floppy disk 20, the front sides of the converter for

an optimal data transfer parallel to and in close contact with the recording surfaces of the disc. W. ± e. \ it is set out in the above-mentioned, co-pending application, this task can best be done with the Z-axis suspension * supply or storage for the lower transducer 33 can be achieved; but in any case the here described, improved, upper transducer arm structure ensures effective and reliable data transmission .

As can be seen in the figures, particularly Figure 2, the arm 35 has a body portion 36 which is preferably molded from plastic or other lightweight, electrically non-conductive material, although it is not essential that it be non-conductive. The body 36 has a generally flat bottom surface 41 with one end cut away at 42 to receive a leaf hinge assembly 43. The leaf hinge assembly includes a leaf spring 44, preferably made of a suitably resilient metal, one end of which is generally adapted to fit into the cut-away portion 42 of the body 36 ₍ and the opposite end of which is shaped to be attached to a stand 50 The overall width of the blade hinge 44, in conjunction with the width of the body 36 and post 50, is chosen to provide the desired degree of torsional rigidity its rigidity or its

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FiTjgierstand opposite ginem Biegen? uy§ ?? i. ⁿ 9§i ^r . ^I> f Ö§ the sheet joint is feenutzt only Anlenkzweske and night as a Federyorspannglied because a separate spring eats 55 provided for this purpose. gas left end of the leaf hinge 4.4 in Figure 2 is spot-welded between the upper and our support plates 45 and A6 , this layer structure is fixed in the cut-away area 42 of the body 36 by fastening means 47. ^: '

The previous practice consisted of inserting the end of the blade joint into the body of the transducer during the injection or shaping process. arms to embed. The one described above in connection with Figure 2; however, improved design has several important advantages. On the one hand b. form the straight edges of the shims 45 and 46 a be ^ - ■: Straight edges that form the beginning of the bendable or fle- jijblen Area of the leaf hinge defined. Another advantage concerns that different shapes and sizes of leaf joints manufactured and fixed to a single type of body 36 can be, §g that ginzelner fttendlerarm- ^ fbau an various leaf joints can be adapted for one Connection to different types of sledges made by different manufacturers, so as to allow for a manufacturing syndrome To provide for reform of the population.

In the preferred embodiment, a stand 50 and a piece 52 are provided for fixing the outer end of the blade hinge. The stand 50 is fastened to the carriage by a suitable fastening means such as a screw. Alternatively, the stand 50 can be made integral with the slide. The stand 50 has a generally flat upper surface which is parallel to the face of the lower transducer and terminates in a straight edge which defines the other axis of bending for the blade hinge A for the arm moving in a downward direction. The outer end of the leaf hinge 44 is arranged on the top side of the stand 50 and is held in place by the clamping piece 52 and suitable fastening means 53 which grip the stator through the clamping piece and the leaf hinge. The inner band of the clamp 52

is rounded as shown at 54 to distribute the stress in the leaf hinge 44 when during an upward bending occurs during a relief operation.

The arm 35 is pressed down towards the floppy disk by a spring 55 which presses against the top of the arm and is attached to the top. side of the clamping piece 52 by a shim 56 and fastening, transmission means 57 is set. The top surface of the stand * - ' 50 runs parallel to the plane of the face of the lower warvd; - lers. The height of the stand 50 is as required; chosen that the end face of the upper transducer at a point in time " immediately before contact with the pane surface in a. Loading operation parallel to the plane of the end face of the lower Wan-cs.— ' lers runs.

The end of the body 36 remote from the hinge structure 43 is with a generally rectangular opening 60 is formed which has a shoulder 61 near its base at one end and a pair of below Spaced steps 62, 63 at its other end: the steps all have the same height from the surface 41.

A flexure 65 is attached to the underside of the outer end of the body 36 by spot welding on fasteners 64, which grip through the arm at the points shown in FIG. The flexure is shown in more detail in FIG. It is made from a thin piece of non-magnetic, elastic material Manufactured: stainless steel is used in the preferred embodiment. Different areas or zones are etched away, to form a two-axis cardan frame or mounting bracket (gimbal). A central rectangular section 66 is continuous Connected to a right-angled ring 68 via symmetrically opposite narrow connecting strips 67. The latter is again connected at opposite connecting strips 69 to the outer portion 70 of the bending piece. It is to be noted that the above-mentioned central section, the ring and the connecting strips are permanently and contiguously part of the same original strip from which the other areas are etched away to form the structure described. - 24 -

The transducer 32 is attached to a part of the central portion 66, as will be described, and the flexure forms a particular biaxial or X-Y gimbal frame for the converter. In detail, the Y-axis runs through the strips 67, from which it is determined, and the X-axis passes through the strips 69 in a similar manner.

The transducer 32 consists of a stack of core pieces and "*: 'ceramic spacers such as that shown generally in U.S. Patent 4,152,742. It has a generally rectangular body with the core pieces being read / write. form · column at the front side of the transducer and erasing and wherein the \ rear legs of the pole pieces for attachment or hh ~ brin supply of magnetic coils, wires, and a rear · -..! ■ rod (back ssary) from the The transducer 32 is glued to the central portion 66 of the flexure, with the transducer body centered at the intersection of the X and Y axes and aligned with its read / write gap in the appropriate direction for data transfer 71 and 72 in the central section 66 form a recess for the rear legs of the core pieces of the transducer structure. According to Figures 3 and 4, coils 73, 74 of the transducer are on the leg ln, which run through the openings and over the flexible member 65. The rear bar or bar can then be put in place.

When the transducer 32 is attached to the arm 35 in the manner described above, the flexure 65 forms a resilient torsion mount, which allows the transducer to be rotated or pivoted about the X and Y axes without any magnetic interference or influence of converter operation occurs.

Electrical connections between transducer 32 and the system, with which this is used, are by means of a connection board 75 with connection lugs 82, a bending strip 81 and a cable made with a plurality of wires. The phenol connection board 75 is generally rectangular in shape and sized so that

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it

it runs alongside the transducer 32 at the central portion 66 of the flexure 65. A central recess 76 is according to FIG Representation in FIG. 2 is provided along one side of the connection board 75. The same edge of the connection board 75 has an interrupted, downwardly extending lip 77, as can be seen from FIG. This lip extends through openings 78 in the flexure member 65 and into a recess 79 in the back of the body "; pers of the converter 32 is provided. The connection board 75 is at "" ' glued to the central portion 66 of the flexure 65.

The bending strip 81 is an extremely resilient or flexible g »* - ■ printed circuit with a plurality of flat conductors 92, the ... between a size or shape of the connection board 75 * --'- " adapted first end 93 and a second end 94 extend, ·· --- where the conductors are enlarged to form pads or terminals 95 to which wires 88 are to be soldered. To the The conductors are provided with holes 96 at the end 93 of the bending strip. End 93 is placed on terminal board 75 and terminal lugs 82 are inserted through holes 96 and into, but not through, the terminal board 75 out. The end 94 of the flex cable 81 extends up through a slot 97 in the body 36 which extends into a recess 37 formed therein opens. A low transverse wall 90 in the recess 87 has small longitudinal slots 91, to frictionally engage and hold the individual wires 88 of a cable 80. Connections or terminals 95 The wires 88 are soldered to the ends of the wires 88, and the end 94 of the Flexural cable 81 can be glued in place at 98 in recess 87.

The wires 88 are the ends of a connection cable 80 that connects to the system (not shown) to which the assembly is to be made use is. Intersecting passages 83, 84, 85 and 86 are formed in the top surface of piece 52, as is can be seen from FIG. Thus, the cable 80 can from the arm 35 to the front passage 83 and from there via one of the three alternate routes may be routed through passages 84, 85 or 86 to carry the cable to the carriages at any one Side or the rear of the stand 50 guide as it is for

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use in a given disc drive design is required. In either case, the cable is held in place by the rear end of spring 55 which pushes down over piece 52 to form the top for the passageways. Preferably, the outer insulation sheath and shielding of the cable 80 are cut away at approximately the point where it runs through the passage 83. The loosely twisted inner wires 88 run under the spring 55 along the top of the body 36 and into the recess 87 to the slots in the bulkhead 90, as previously described. The stripping: - peeling off the outer sheath and shielding before the wires do the. ": Crossing the leaf joint has proven to be desirable ". so that the rigidity of the cable 80 does not interfere with the bending of the blade-Y joint. By routing the cable and wires in the manner described above, the required electrical connections between the head and carriage are made in a secure manner, with the cable and wires from accidentally pinching both during assembly and during operation (snagging), binding or eating (binding) © the abrasion are protected by other components. This routing is clearly preferred over a known technique in which the cable is glued to the side of the arm, stand and slide.

The use of the connection board 75, the connection eyelets 82 and the bending strip 81 leads to a significant simplification of the Operation of tying the windings 73, 74 on the wires of the cable 80 and external circuits. It should be noted that the wires used in the winding of the coils 73, 74 are extreme fine and sensitive country. In the prior art, which does not have a connection panel 75 and bolts or rivets 82, it was necessary to attach these delicate wires directly to cushions or cushions or to solder connections to a bending strip, which is a difficult process at best and in which the Bending strip is subject to excessive heating if the wires are heated to a sufficiently high temperature, to burn away their isolation. These issues are addressed with the

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The present invention is solved by first simply winding the sensitive wires from / the coils 73, 74 around the corresponding connection terminal 82, which conveniently holds the wires in place. The bolts 82 can then be subjected to heat and solder in order to simultaneously solder both the wires to the connection lugs and these to the flexible strip conductors. . Since no manual holding or positioning the SENS-borrowed wires occurs during the soldering, brazing may generally be in minimum Zeitbewerkstelligt, and with a minimal chance of damage to the coil windings or the bending strip, which otherwise lead to a short circuit between the bent strip ^conductors: lead could. After the soldering process, the excess length of the sensitive wires can be broken off.

As can also be seen from FIG. 2, the opening 60 in the body 36 of the arm can be closed by a snap-in insert 120 which has an upper part 121 with a lifting flap 122. The walls of the opening 60 are slightly undercut, as is evident at reference numeral 123 of Figure 8 to accommodate a plurality of one-piece with the upper part 121 resilient locking hooks 124 depending from the upper part to engage with the undercuts into engagement. In addition, one wall of the insert 120 is formed as a coherent resilient member 125 to engage the body 36 near the point where the flexural strip 81 passes through the slot 97. The insert 120 can be manually snapped into place in the recess 60 into engagement with the shoulders 61, 62 and 63 with its resilient locking hooks 124 engaging the undercut areas 123 of the recess. The resilient member 125 presses against the rear edge of the recess opening 60 to stabilize the position of the insert 120 along the Y-axis. The cover 120 can then be permanently fixed in place.

The insert 120 is provided with a plurality of reinforcing ribs, as shown in FIGS. One of those ribs which is assigned the reference number 130, has a central magnification

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tion or extension 131 in which a threaded hole 132 is formed which extends obliquely through the insert to receive a set screw 133 . As can be more clearly seen in Figure 9, the set screw 133 has a rounded or spherical tip 134. The set screw 133 is angled to fit through the recess 76 in the terminal board 175 and with the top surface of the flexure 65 to engage while at the same time leaving free space for the coils. The point of contact. " between the locking screw and the flexure is at the intersection of the X and Y axes of the flex 65 described above.

The tip of the set screw 133, which is for a nominal or -

Target engagement with the flexure 65 is positioned, forms a pivot point for the X-Y gimbaling action of the Converter 32. Any combination of rotary or pivoting movements about the X and Y axes is permitted by the flexible member 65, so that the transducer face can be adapted to the level of the lower transducer during a data transmission process. It however, no movement of the flexure is allowed in an upward direction perpendicular to the surface of the disc, where rather forces in this direction through the transducer, the locking screw 133, the snap top 120 on the arm than a Whole are transferred. Similarly, the force applied to transducers 32 and 33 is used to properly engage the floppy disk is applied by the spring 55 via the arm body 36, the snap cover 120 and the set screw 133 on the transducer 32 transferred.

The use of the snap-in insert 120 provides a number of practical advantages in the manufacture of transducer assemblies. On the one hand, before inserting the insert 120, an undisturbed opening on the top side is provided in the arm 35, which enables the assembly of the coils, the rear bar or bar and the connection board as well as the step of connecting the coil) significantly relieved. Since the locking screw 133 in the

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Insert 120 is arranged / there is also no swing. or pivot bolts in the arm near the converter coils v-ie in the prior art, so that the structure is further simplified.

Another advantage is due to the fact that different inserts 120 with different sized and shaped lifting flaps 122 can be provided to meet the requirements of different gentlemen ... " suppliers of drives, whereby the production of a :, single base arm assembly is possible.

Although in the preferred embodiment the locking screw:; Is used 133 to the articulation point for the gimbal or · mounting bracket to form the upper converter, it is instead harden ^ 'possible to use a bolt, adjusted the location thereof; _; _, or an insert molded pin to be provided in the insert 120. However, the locking screw or the adjustable bolt is preferred for precise adjustment.

With the insert 120 in place in the arm, the set screw 133 is adjusted so that its tip, which forms the actual pivot point is just in a plane with the underside surface 41 of the arm 35; or with in other words, until it just contacts the surface of the flexure 65 in its unbent condition. This can be done best check the electrical continuity or the electrical Transition between the locking screw and the flexure can be carried out during the setting process.

Both the adjustable locking screw 133 and an adjustable one Bolt has advantages over a pivot point which, as in the prior art, consists of a plastic projection in the Arm is formed. A plastic pivot point is prone to wear and tear, whereby a flat or even spot is formed, which is worse for the cardan frame than a hard, rounded pivot point is. There are also difficulties with the accuracy of positioning a molded plastic

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- * ■ - ■ 30A9955

fabric pivot, and an adjustable pivot point like that Locking screw 133, or an adjustable bolt, can be used for a optimal position can be adjusted accordingly. If the pivot point is too high or too far from the flexure, there is an excessive jumping of the converter during loading. If the pivot point is too low, the flexure will; deformed. ; · -

FIG. 9 shows in greater detail the positional relationship of the obeo'eh ".

Converter 32 and the lower converter 33 in the operating position in

Engagement with the floppy disk 20. The lower transducer 33 is a "part of a lower transducer head structure having a base in the form of *". '. an octagonal nut configuration has what is in the industry "as a 'half-round ¹ (button head) configuration known. De :: lower head holder comprises an outer supporting mold or a casing 150, which is molded from plastic material, with a tapered or conically shaped upper ring portion 151 surrounding a generally flat circular plateau area 152. As previously mentioned, the lower transducer could be of the type known in the art in which the transducer is immovably fixed in the housing However, it is preferred to use a Z-axis suspension transducer 33 as disclosed and claimed in the copending application identified above, and the transducer 33 can then have a limited amount of movement in the Z-axis that is perpendicular The sliding transducers 32 and 33, apart from their respective suspension and support structures, are preferably above them agreeing. This leads to an economic advantage in terms of simplicity and ease of manufacture, and there is a functional advantage in that the mutual contact areas on the upper side and the lower side of the floppy disk are the same size.

When designing 'half-round' (button head) transducers for single-sided floppy disks, it is customary to provide a converter that is mounted in alignment with the housing, but with the converter face is rounded and to ensure a good one

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Room

Contact protrudes into the nominal disk plane. It is not practical to have a domed transducer face on a double-sided one System to use. In double-sided disc systems it is therefore preferred for a matching opposing communal Ensure that the transducer faces are flat in contact with the disk. The plastic body of the housing 150 does not have to - touch the surface of the floppy disk, as nature The property of the plastic is such that it has the oxide: '

coating scratches and wears off, even if the plastic material

rial is initially polished smooth. The discussed in the above - 'U.S. Patent 4,151,573 disclosed known double-sided head structure, - using a lower converter ¹ on the one hand (button housing) is immovably fixed in the Halbrundkopjrr housing and on the other hand - * - "a large shoulder area of ceramic material The large ceramic shoulder area is necessary so that the plastic housing does not touch the floppy disk.

It has been found to be beneficial, a smaller one, in general right angle lower transducer protruding upward from plateau area 152 of lower housing / rather to use than the type of structure discussed above. This reduces the cost of the lower transducer as it is, with the exception of the finishing process can be made coincident with the upper transducer.

The one up from the plateau surface 152 of the lower housing Projecting lower transducers 33 are provided with ramps 160 and 161 to guide the disk during insertion and removal to protect the converter and facilitate entering and removing the disk. The ramps 160 and 161 are contiguous with the plateau surface 152 formed and extend over this on either side of the location of the transducer 32. When required, as in the case of the co-pending application identified above relating to a

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- ar- 30A9955

Z-axis flexure suspension device, ramps 160 and 161 to be bifurcated or split or gapped over its extent at right angles to the plane of FIG Provide space for the lower head to hang it up.

During the process of inserting a floppy disk into the head assembly, the upper arm 35 is pivoted upward at its blade joint, as shown in FIG -Lift flap engages. When the floppy disk is moved into the head assembly in the direction indicated by arrow 165 in Figure 13, the leading edge 162 of the shell or jacket ¹ comes up. 21 engages the ramp 160 to slide up on it. As can also be seen in detail from FIG. 12, a bevel 153 is provided adjacent to the ramp 160 along the edge of the lower transducer, which also helps to guide the casing over the transducer surface. The top of the ramp 160 is higher than the beginning of the chamfer 153 to ensure that the disk does not engage the side of the transducer. Once the floppy disk is in place, the arm can be released to load the heads onto the floppy disk through the access windows.

To remove the floppy disk, the arm 35 is raised again, and the jacket is moved in the opposite direction. At this point the ramp 161 and the adjacent one will be beveled Edge 154 on the other side of the lower transducer is important to guide the sleeve 21 of the diskette. The part of the shell 21 at the end 24 of the slot comes with the ramp 161 and the beveled Page 154 of the transducer engages to slide up and then over the transducer. Thus, the ramp prevents connection with the beveled edge of the transducer that the end 162 of the jacket or the end 24 of the access slot of the Sheath or the sheath comes into engagement with the side of the transducer during the insertion or removal process and forces on this exercises.

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304995 B

It is part of normal practice to work on the face of transducers bevel of the planar type of adjacent edges. This happened by making a bevel of about 22 degrees to the plane of the face on each of the four edges delimiting the face. The bevel is often adjusted by polishing or grinding over a small radius at the point where it κ-it the front side meets so that there are no sharp pathogens ^ moderation or edge is present, which leads to wear and tear and causes excessive wear and tear on the gelar.xr over the head lowing recording medium.

The transducers of the preferred embodiment have such a £ br bevel, but they also have an important bevel " provide at the corners of the transducers. It has been established; d-at> the significant wear on the disk surface not during steady state motion of the disk across the transducer for one Access occurs in the operational data transfer position, but occurs during the loading and unloading processes. It is established it has been found that in known systems excessive wear on the disc is caused by the corners of the transducer,. when the upper arm comes down to load its transducer onto the disc. A somewhat similar wear problem arises during discharge as a result of an eccentric (off center) Raising the arm, causing a pulling or tugging of one or two corners of the transducer. If the End faces of the transducer in the moment of contact with the disc during loading would be exactly mutually parallel and if the Disc would be exactly planar and would have no impact or no deformations, the corners adjoining the end faces would of the converter will not be a problem. In practice, however, there is some degree of non-parallelism due to the inevitable Manufacturing tolerances and due to the fact that the 'free' or neutral position of the flexure 65 is not necessarily holds the transducer 32 parallel to the disk. In practice, this means that the upper transducer at the time of Impact on the disc is not arranged parallel to either the disc or the face of the lower transducer, namely

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It

most likely due to some combination of twists about the X and Y axes. This in turn means that there is one corner of the transducer that engages the disc first occurs, so that the impact force is concentrated in a small area and leads to piercing or penetration into the oxide coating leads.

To reduce these problems, the corners as well as the the transducer end faces adjoining edges in the case of the. Improved converter structure shown beveled. The front sides the upper and lower transducers are correspondingly in · '· Figures 10 and 11 shown. The lower transducer 33 is provided with 'a beveled edge, which in FIG. 11 in the references: -' len 153, 154, 155 and 156 is shown. The ones on the edges 1-S3- ". and 154 provided bevel is 30 degrees in order to facilitate the guide operation of the disk during insertion and removal in the previously described way to support. For the sake of simplicity, the bevel attached to the edges 155 and 156 can hereby be used be consistent. Those beveled edges alone would cut at the corners and leave a sharp edge, which, while tapering away from the disc, still provides a stress concentration point for cutting grooves or for Penetration into the surface of the disc on impact would form. These edges are beveled at each corner by means of conically Removed portions 157 that interfered with bevels 153-156 skip .. In addition, all edge and corner bevels are smoothed and during a final polishing or grinding process formed tangentially merging into the face of the transducer to avoid any sharp edges and irregularities from the Remove the face area.

The upper transducer 32 is similarly provided with edge bevels 140-143, which are preferably 15 degrees, and with corner bevels 144 provided. Again, all bevels are designed to merge into one another and to the end face in order to keep them all sharp Remove margins. The 15 degree bevel is for the top one Converters preferred as they result in a wider corner bevel

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3043955

leads to distribute the impact force even better. The 30 degrees However, bevel is preferred for the lower transducer to interact with ramps 160, 161 as previously described became.

Claims (23)

Claims M. ) Converter arm assembly for use with a double 1 se: itigeh. Floppy disk (magnetic disk storage, er), characterized by '- a combination of ^: _ ^; an elongated body portion, the first and second ent · ;, to set sides and near a first end thereof a * .- between the sides extending through opening has, '■ - ■' ■ hinge means at the second end of the body portion for connecting it with a Support member, a substantially planar flexural member that has an open central portion and is designed accordingly i.st to pivot the central portion about mutually perpendicular. Allowing axes in the plane of the member, a transducer attached to the flexure to partially protrude through openings therein, means defining the flexure on one side of the arm to extend across the opening therein _f and a cover for closing the opening in the arm on the second side thereof, the cover including a lift tab positioned laterally projecting over the arm and including a pivot member positioned appropriately to protrude into the opening and with the flexure member to engage at the intersection of the axes. 2. Structure according to claim 1, characterized in that the pivot member is adjustable in a direction which is at least has a component perpendicular to the plane of the flexure. 3. Structure according to claim 2, characterized in that the Swivel member a Feststellbzw screwed through the cover. Adjusting screw is. - 2 - 4. Structure according to claim 1, characterized in that the cover has an insert shaped to match the opening in the body to thereby locate the To determine pivot member with respect to the bending member. 5. Transducer arm assembly for use with a double-ended Floppy disk characterized by a combination of an elongated body section, the first and second opposite ----- opposite sides and therein near a first end thereof -; - one Has opening, ■. * .. a transducer attached to the opening for a pivoting movement ± n ... in relation to this, - _: - - Hinge means at the second end of the body portion for connecting the structure to a support, one of the -..-. second end protruding leaf spring is included and clamping element: tel on the surface remote from the leaf spring with passage means are designed to conduct electrical conductors to the transducer, and a bias spring having a first end connected to the body portion engages at a location spaced from the second end thereof and the second end thereof on the surface the clamping means is fixed and covers the passage means therein. 6. Structure according to claim 5, characterized in that the joint means is detachably attached to the body portion. 7. Structure according to claim 5, characterized in that the clamping means has a plurality of intersecting passages led by the biasing spring for guiding a multi-conductor cable to be completed to the body portion, and that the body portion Means for frictional or frictional holding of individual conductors of the cable for connection to the converter contains. 8. Converter arm assembly for connection to a double-sided floppy disk, characterized by a combination of "*" 30A9955 an elongated body portion with first and second opposing ones Sides and having a through opening located near a first end thereof between the sides, Hinge means at the second end of the body portion for connecting the same to a brace, a substantially planar flexure member that has an open central portion and is shaped to; : a pivoting movement of the central section about one another; "■ to allow right-angled axes which normally lie in the plane of the limb. "" ". a transducer attached to the flexure to partially -; *, wise to protrude through the openings in it, whereby the * " Transducer a working face on one side of the bending element - "-" - des and has winding means on the other side of the flexure, Means which fix the flexure on one side of the arm so that the winding means are in the opening in the arm are located, Conductor means extending along the body portion for connection to an external system, a terminal board which is fixed on the other side of the flexible link adjacent to the winding, and connection means on the panel for selective connection to the winding and to the conduit means for therebetween to enable a connection. 9. Structure according to claim 8, characterized in that the line means contain the conductors of a resilient or resilient printed circuit. 10. Structure according to claim 8, characterized in that .the connection means Have connection eyelets for winding the ends of the wires of the windings. 11. Structure according to claim 9, characterized in that the printed Circuit is positioned on the terminal board that the connection eyelets in the areas of the printed thereon Conductors pass through with the lugs for wrapping around of the ends are set up, whereby the conductors and the wires are appropriately positioned for simultaneous To enable soldering of the same to the connection eyelets. 12. Magnetic transducer for use in a magnetic disk data storage system, characterized by core and Kei? Aj-_ ^: mik pieces which are glued together to form a transducer ^: * "body having a planar face with the . positioned therein gap for contact with a Scheibenaiif- 'recording medium in data transfer operations, said; _dle: at the end face of the adjacent edges of the converter body are chamfered (and) the corners at the intersections of arrival: are bevelled adjacent edges and: Edge as well as Ec ken-. Bevels are adapted or rounded to merge into the flat end face in order to avoid surface irregularities , whereby stress concentrations on the recording medium in the event of an engagement of the (corner) corners or edges of the transducer with the recording medium during a transducer -Loading or discharging can be avoided. 13. Magnetic transducer according to claim 12, characterized in that that conical area chamfers are attached to the corners to match the edge chamfer on each side the corner. 14. Converter structure for double-sided floppy disks, marked by first and second transducers, each of which has a body with a planar face in which a read / The write gap is located by means of the first and second transducers for movement to an operational data transfer position support or hold, in which the end faces of the first and second transducers in mutually opposite Contact with opposite sides of the recording medium the floppy disk are located, the first and second transducers, beveled edges and beveled corners on the cutting edge adjoining the planar end faces - 5 - '* - 30A9955 place of the edges adjoining the planar end faces and wherein the edge and corner bevels are adapted or rounded to merge into the planar end faces of the transducer , so that stress concentrations on the recording medium in the event of an engagement of the (corner) corners or edges of a transducer body with the recording medium during loading or unloading of the transducers on the recording medium: can be avoided. : " 15. converter structure according to claim (16) JjI, characterized) that conical area slopes are attached to the corners, to match the bevel on either side of the corners. 16. converter structure according to claim (16) J_ £, characterized in that that one of the transducers has edge and corner bevels at an angle of about 30 degrees to its planar face and that the other of the transducers edge and corner bevels at an angle of about 15 degrees to its planar face Has. 17. (Converter support arm hinged by a leaf spring for a Connect to a movable transducer holding carriage in a double-sided magnetic floppy disk transducer assembly, marked by:) A transducer support structure for a double-sided floppy disk recording system, characterized by a transducer support carriage with a first magnetic transducer attached thereto, by a thin flexible leaf spring joint member, by an elongated support arm which (means for mounting) has a second magnetic transducer attached thereto and adjacent one end thereof for contact in operative position with a recording medium, the support arm having a generally flat configuration of its surface which in operative position abuts the recording medium and in which it is in flat surface has a recessed portion that is adjacent to that of the second Converter remote. End of the arm adjoined by a first clamp plate adapted to be received in the recessed portion of the arm, by a second clamp plate, by means connecting the clamp plates on opposite surfaces from one end of the leaf hinge member, and for connecting the sheet joint and the clamping plates with the arm, wherein the first clamping plate is positioned in the} recess, (and) wherein said first and di-] th clamping plates opposite straight have edges which are in communication with each other, a bending axis, or axis of rotation for the leaf spring hinge (.), and by means which ^: attach the other end of the blade hinge to the carriage to position the support arm so that the first and target transducers are in generally opposed relation . wherein the support arm can be unfolded to allow insertion of a floppy disk and closed to bring the first and second transducers into operative contact with opposite sides of the floppy disk . 18. The device according to claim (19) _1_7, characterized in that the first and second clamping plates and the recess are designed so that when assembled, the outer surface of the second clamp plate is generally planar with the generally flat surface of the arm. 19. The device according to claim (20) _1_8, characterized in that the gill means are spot welded generally along the opposing straight edges and adjacent thereto at the blade hinge are. 20. (New) Magnetic Transducer Support Structure for Double Sided Floppy Disks A recording system characterized by a transducer support sled through one attached to the sled Converter support housing, through a first magnetic converter, which has a flat face for an operational Touching the floppy disk recording medium has, by means for mounting the first transducer to the housing, at least a portion thereof including the planar face protruding from the surface of the housing to enable contact with the disk recording medium during data transfer operations, through a support arm having one end thereof adjacent attached second magnetic. Has transducer and which is articulated at its other end to the carriage or carriage, the first and second: ■ transducers in a generally opposite positional relationship. .. so that the support arm can be opened to allow a diskette to be inserted generally between the carriage and ^: the support arm, and so that the support arm can be closed to engage the first and second transducers in operation. contact with opposite sides of the disk recording medium, and by a guide ramp attached to the housing and positioned adjacent to the protruding portion of the first transducer along the side portion thereof facing in the direction from which the disk is is used, wherein the ramp has a surface that slopes from the surface of the housing against but not to the plane of the face of the first transducer to engage the leading edge of a disk jacket during insertion of the same and move it over the first Lead converter. 21. (New) Magnetic transducer support structure for a double-sided floppy disk A recording system according to claim 20, characterized by a second guide ramp attached to the housing and to the protruding portion of the first transducer along the opposite side from the first guide ramp positioned adjacent, the second ramp having a surface that is opposed to the surface of the housing but does not drop to the level of the face of the first transducer in order to access the edge of the disk jacket during removal of the disk sschlitzes to engage and to guide it over the first transducer. - 8th - 22. (New) Magnetic Transducer Support Assembly for Double Sided Floppy Disks Recording system according to Claim 20, characterized in that the first transducer has one which is adjacent to the ramp has beveled edge to continue to lead the disk jacket over the face of the first transducer. 23. (New) Magnetic transducer support assembly for a double-sided floppy disk Recording system according to claim 21, characterized in that indicates that the first transducer is adjacent to the ramps. has beveled edges to further extend the disk jacket over "" to guide the face of the first transducer. -