Abstract:
A wide tape drive for use with a wide tape holder having a frame with an open top and an open bottom non-permanently closed with a top cover and a bottom cover, releasably held together and releasably held to the frame by snap connections respectively disposed at lateral sides of the holder, the wide tape holder containing two tape hubs rotatably mounted therein proceeding substantially parallel to the lateral sides of the frame, has a base plate with two guides projecting substantially perpendicularly from the base plate which receive the wide tape holder therebetween. The drive has at least one drive motor having a drive shaft disposed between the guides, which is inserted to and engages one of the tape hubs. A magnetic read/write head is mounted on a head position assembly between the guides, and orients the read/write head relative to the tape when the wide tape holder is inserted in the tape drive. Two grippers are mounted on the guides to engage the snaps at the lateral sides of the holder as the holder is moved between the guides, thereby releasing the snaps to free the top cover and the bottom cover from the frame. Two lifer mechanisms also are respectively mounted on the guides, and respectively engage the top cover and the bottom cover after they are freed from the frame, to move these covers away from the frame, thereby producing a spacing in the drive between the top cover and the bottom cover which allows all of the magnetic tape in the wide tape holder to be wound on one of the hubs.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention relates to a tape drive for wide magnetic recording tape.  
           [0003]    2. Description of the Prior Art and Related Applications  
           [0004]    The use of magnetic tape as a medium for data recording has the significant advantages of a relatively low cost and a relatively large recording surface area. Nevertheless, conventional magnetic tape has certain disadvantages associated therewith.  
           [0005]    A first of these disadvantages is that tape is a sequential medium, which means that when a data transfer head is located at a beginning of a tape, it is necessary for the tape to be transported along its entire length in order to retrieve (or re-write) information at the end of the tape.  
           [0006]    A second disadvantage is that, due to the desire and necessity of storing as much data as possible within an available tape area, the data transfer head technology as well as the recording media technology are pushed to their quality limits.  
           [0007]    Moreover, many existing drives and cartridges must be designed within specified form factors, in order to satisfy standardization requirements. As an increasing number of functions become available, which are desired to be accommodated in a drive or on a tape, data storage area or other functions must be sacrificed to accommodate the new, additional functions, or some type of compromise must be reached in the overall design.  
           [0008]    Among the more important market requirements which are expected in the near future for data storage on tape is that the need for higher storage capacity will continue to increase, at an even faster rate than previously. As discussed below, for example, the storage capacity of a currently available single cartridge is not sufficient for unattended backup during a longer period of time, and therefore so-called autoloader systems have been developed to automatically insert and remove a number of cartridges in a sequence.  
           [0009]    Further market requirements are expected to be a need for faster time to access data, a need for an increased data transfer rate, a lower cost per MB (megabyte) and an overall improved quality and reduced cost.  
           [0010]    As noted above, the limited data storage capacity of conventional cartridges has resulted in the development of autoloader systems. Conventional autoloader systems, however, are not a satisfactory solution to the problem of storing a large amount of data in an unattended backup procedure over a relatively long period of time. Several disadvantages exist with regard to currently available autoloader systems.  
           [0011]    Because such autoloader systems make use of a large number of cartridges, the cartridges are made relatively small, and therefore have a limited space available for use for data storage. Typically, six to ten of such cartridges must be put in a magazine in order to have sufficient storage area (capacity). Because of the relatively small size of the cartridges, the drive is also made small, in order to match standardized form factors. The drive is disposed in a system housing, which also contains robotics, electronics and software needed for loading an unloading the cartridges.  
           [0012]    The relatively large number of components, and therefore the relatively high cost, associated with conventional autoloader systems makes the use of such systems an unattractive alternative for a customer who merely wants long term data backup.  
           [0013]    To address these problems, a tape cartridge and a drive for extremely wide tape are disclosed in co-pending U.S. application Ser. No. 691,165, filed Oct. 19, 2000, the teachings of which are incorporated herein by reference. The tape cartridge and drive described therein accommodate tape having an extremely wide width, such as a width that is greater than approximately 24 mm, or in a range between approximately 24 mm and approximately 127 mm.  
           [0014]    The width of this extremely wide tape, therefore, is greater than that of a conventional magnetic recording tape by a factor of 6 to 10 times. Because the tape has this extremely wide width, the total tape length can be made significantly shorter while still making the same total area available for data storage. Making the tape shorter, however, requires less time for winding and unwinding the tape from the hubs on which it is carried in order to access data at a particular location on the tape.  
           [0015]    It is important, however, that the housing for accommodating such extremely wide tape have the same, or substantially the same, form factor as conventional recording cartridges, so as to be accommodated in the openings for conventional tape cartridges in tape drives and auto loaders and magazines. This means that the axes of rotation of the tape hubs in cartridges for accommodating extremely wide tape will proceed parallel to a “longer” dimension of the cartridge housing, rather than perpendicular to the shortest dimension (height) as in a conventional cartridge housing. Given a length of extremely wide tape which is necessary to provide the same total area available for recording data on the tape as a conventionally sized tape, such a length of extremely wide tape can be accommodated in a housing having a height which is comparable to the height of a conventional tape cartridge only when the tape is substantially evenly distributed in respective tape packs on the two hubs in the housing. When any significant amount of extremely wide tape is wound onto one of the hubs, the diameter on the tape pack on that hub increases beyond the standard height of a conventional cartridge housing.  
           [0016]    This problem could be addressed by simply providing a lesser length of extremely wide tape in the cartridge, so that even when all of the tape is wound on one tape hub in one tape pack, the diameter of that tape pack still would not exceed the height of a standard tape cartridge.  
           [0017]    This would defeat one of the advantages of employing extremely wide tape, however, by decreasing the total area available for recording data.  
           [0018]    To address this problem a tape cartridge is disclosed in co-pending U.S. application Ser. No. 09/859,328, filed May 16, 2001, which accommodates an amount of extremely wide tape therein having a total area available for data recording which is substantially the same as the area available for data recording in a conventional tape cartridge, and which has a form factor which is substantially the same as the form factor for a conventional tape cartridge. The tape cartridge disclosed in this co-pending application has a housing with two tape hubs rotatably mounted therein with wide magnetic recording tape wound thereon for winding and unwinding between the two hubs in a tape transport direction, with the housing being composed of first and second housing parts which are movable relative to each other in a direction perpendicular to the tape transport direction and which is also perpendicular to the rotational axes of the hubs, to accommodate an increase in diameter of the tape pack on one of the hubs which arises as the extremely wide tape is wound onto that hub. The housing thus can expand in the movement direction.  
           [0019]    This problem also is address in a co-pending United States application filed simultaneously herewith having Attorney Docket No. P01,0336 which discloses a tape holder formed by a four-sided frame in which two tape hubs are disposed, with wide magnetic recording tape wound thereon for winding and unwinding between the hubs in a tape transport direction. The frame therefore does not form a housing in the conventional sense because it does not have a top and a bottom which are permanently fixed to the sides of the frame. The frame may be provided with a top cover and a bottom cover for protecting the recording tape from dust and other contamination during storage, however, if such covers are used, they do not have a permanent connection to the frame, and are only held in place by a snap arrangement, so that during use of the frame in the drive, the covers are separated from the frame and therefore the frame is open at the top and at the bottom, and the diameter of the respective tape packs on the hubs is therefore not constrained by any fixed housing dimensions.  
         SUMMARY OF THE INVENTION  
         [0020]    It is an object of the present invention to provide a wide tape drive which is suitable for use with a wide tape holding frame, as disclosed in the aforementioned co-pending application having Attorney Docket No. P01,0336 filed simultaneously herewith. This object is achieved in accordance with the principles of the present invention in a wide tape drive having drive motors with respective drive shafts for engaging the two hubs in the tape holding frame, and having two guide arms, respectively disposed on opposite sides of the drive motors, which engage and interact with the tape holding frame as it is inserted into the drive to simultaneously release a snap connection holding the top end bottom covers to the frame, and to separate the top and bottom covers from the frame so that there is no impediment to all of the tape in the tape holding frame being wound onto one of the hubs, with a tape pack diameter exceeding the height of the frame.  
           [0021]    As noted above, the wide tape holding frame has tape hubs with oblong flanges having a shorter dimension which approximates the height of the tape holding frame and a longer dimension which exceeds the height of the tape holding frame and allows all of the tape to be wound in a single tape pack on one of the hubs. The tape drive in accordance with the invention has a light transmitter/receiver system for detecting whether a reflective surface on the hubs is oriented behind a sight opening in the tape holding frames, so as to detect whether the flanges are oriented with their longest dimension proceeding parallel to the side of the tape holding frame, or in a position substantially perpendicular to the aforementioned position.  
           [0022]    The tape drive also has a detector for interacting with a manually actuatable slide element on the wide tape holding frame, to detect a position of that slide element. Depending on the detected position, the drive will either inhibit or enable writing of data on the tape in the wide tape holding frame. Data which is not to be erased or overwritten can thus be protected by actuating the slide element.  
           [0023]    In one embodiment, each of the guide arms has a gripper hook thereon, which engages an opening in the side of the tape holding frame to pull the tape holding frame into the drive. After the tape holding frame has been pulled a certain distance into the drive, this gripper hook is forced to project further into the opening, thereby releasing the snap connection which holds the top and bottom covers to the frame. As the wide tape holding frame is pulled further into the drive, lifters which are pivotably mounted at each guide arm respectively engage the top and bottom covers, and separate them from the frame. Thus, when the wide tape holding frame is fully inserted into the drive, it has no impediment at the top or bottom of the frame restricting the diameter of the tape pack which can be wound onto either of the hubs. The mechanism operates in reverse when the wide tape holding frame is removed from the drive, to replace the top and bottom covers, and allow the snap connection to re-engage to hold the covers together on the frame. 
       
    
    
     DESCRIPTION OF THE DRAWINGS  
       [0024]    [0024]FIG. 1 is a perspective view of a wide tape holding frame, for use in the inventive drive, with the top and bottom covers held to the frame by a snap connection.  
         [0025]    [0025]FIG. 2 is a perspective view of the wide tape holding frame of FIG. 1, as it appears after insertion in the inventive drive, with the snap connection released so that the top and bottom covers are separated from the frame.  
         [0026]    [0026]FIG. 3 is a rear perspective view of the wide tape holding frame of FIG. 1, showing a slide for right protection.  
         [0027]    [0027]FIG. 4 shows the internal components of a wide tape drive constructed and operating in accordance with the principles of the present invention, in a perspective view with the housing removed.  
         [0028]    [0028]FIG. 5 shows the wide tape holding frame inserted into the inventive drive, as seen from the drive access opening, with surrounding components not being illustrated.  
         [0029]    [0029]FIG. 6 is a sectional view as indicated by the arrows in FIG. 5.  
         [0030]    [0030]FIG. 6A is a detail from FIG. 6.  
         [0031]    [0031]FIG. 7 is a perspective view showing the basic arrangement of the wide tape holding frame and the guide arms, when the wide tape holding frame is inserted in the inventive drive, with other components being removed.  
         [0032]    [0032]FIG. 8 is an enlarged perspective view, with the base plate and one of the guide arms being removed, for explaining the operation of the inventive drive.  
         [0033]    [0033]FIG. 9 is a perspective view of the basic components of a first embodiment of a read/write head positioning mechanism for use in the inventive tape drive.  
         [0034]    [0034]FIG. 10 is a perspective view of a second embodiment of a read/write head positioning mechanism for use in the inventive tape drive.  
         [0035]    [0035]FIG. 11 is a sectional view showing the wide tape holding frame, with the top and bottom covers separated from the frame in the drive.  
         [0036]    [0036]FIG. 12 is a side sectional view of the tape drive in accordance with the invention with the wide tape holding frame inserted therein. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0037]    The wide tape holding frame and cover assembly  1  shown in FIG. 1 has a rectangular frame  2  with a bottom cover  3  and a top cover  4 . One side of the frame  2  has a hinged access door  5 , which allows tape guides and a read/write head element to be inserted, as described in further below. This side of the frame  2  also has access openings  6  respectively in registration with tape hubs  7  that are rotatably mounted in the frame  2 . The access openings  6  allow respective drive shafts  19  of a tape drive  16  (See FIG. 4) to be inserted into the tape hubs  7 , as also described in more detail below.  
         [0038]    Each lateral side of the frame  2  has an opening  8  therein, which serves two purposes. The opening  8  serves as a gripper recess during loading of the cartridge into a drive  16 , as described in more detail below, and also serves as an access opening for receiving projection  21  (see FIG. 2) on the bottom cover  3 , as also described in more detail below.  
         [0039]    Each lateral side of the frame  2  also has grooves  9  which respectively receive projecting surfaces of cartridge guide arms  26  of the drive  16  (see FIG. 4).  
         [0040]    Recesses  10  are also formed in the bottom cover  3  and the frame  2  which serve as notches for robotic handling of the frame  2 , with or without the covers  3  and  4 .  
         [0041]    The side of the frame  2  in which the access door  5  and the access openings  6  are disposed also has sight openings  11 , the purpose of which is described below.  
         [0042]    Each tape hub  7  has a shaft with an internal bore therein for receiving a drive shaft  19  (see FIG. 4) and flanges  65  (see FIG. 11) at opposite ends. On each tape hub  7 , one of flanges  65  is disposed adjacent to the side of the frame  2  in which the access openings  6  are present, and has toothed projections for engagement with the tape drive  29  in a known manner.  
         [0043]    Each of the flanges  65  which are adjacent to the side of the frame  2  containing the access opening  6 , has a reflective surface thereon which, when that flange  65  is oriented within the confines of the frame  2  (as shown in FIG. 1) is disposed behind the sight opening  11 . The reflective surface has a different reflection characteristic from the remainder of the material of the flange  65 , such as by being a different color. Light transmitter/receiver arrangements  38  (see FIGS. 4 and 8) in the tape drive  16  determine when the flange  65  (and thus the flange  65  at the opposing end of the tape hub  7  as well) is oriented as shown for the lower flange  65  in FIG. 2, or at an angle relative to that position to accommodate an increased diameter of tape wound on the hub  7 , as shown for the upper flange  65  in FIG. 2.  
         [0044]    The frame  2  with the tape hubs  7  therein can be used by itself in an environment which is suitably dust-free and contamination-free. The covers  3  and  4  are optional, for providing a complete enclosure the magnetic recording tape wound on the tape hubs  7 , when necessary.  
         [0045]    The dimensions of the frame  2  with equal amounts of tape  13  wound on the respective tape hubs  7  are approximately 4″×4″×0.8″. In a write/read operation mode, the maximum tape pack diameter can be approximately 0.9″. The frame  2  alternatively can have dimensions of 4″×5″. If the top and bottom covers  3  and  4  are used, the cartridge dimensions therewith are approximately 4″×4″×1″. The distance between the outside surfaces of the covers  3  and  4  in the write/read position (shown in FIG. 2) is approximately 1.6″. This means that the cartridge will fit into a standard form factor drive.  
         [0046]    As shown in FIG. 3, a slide element  41  is movable back and forth in an opening  42  in the backside of the frame  2 . The element  41  has a tab  43  which, depending on position of the element  41 , is either flush with or recessed from a side surface of the frame  2 . The status (flush or recessed) of the tab  43  is detectable by suitable means (optical, sonic, etc.) in the drive  16 . Depending on the position of the slide element  41  in the opening  42 , which is manually set, the drive will enable or disenable writing of data on the tape  23 , thereby preventing an inadvertent alteration of previously recorded data.  
         [0047]    The expanded assembly  1  is shown in FIG. 2, to illustrate the position of the components when it is in a drive  16  (the surrounding drive not being shown in FIG. 2) for conducting a read or write operation. The top and bottom covers  3  and  4  have been separated by the frame  2  by a mechanism in the tape drive  16  described below. This mechanism presses through the access opening  8  in each side of the frame  2 , thereby pressing against the projection  12  and releasing the bottom cover  3  from the frame  2 . The projection  12  is mounted on a flexible flap, which has a flange at its end which engages an opening in an inner flange of the top cover  4 . When the projection  12  is pressed to release it from the access opening  8 , this also causes the flap to flex, thereby also releasing the flange from the opening, thereby freeing the top cover  4  from the frame  2  as well.  
         [0048]    As can be seen in FIG. 2 as well as in the cross-sectional view in FIG. 11, the bottom cover  3  has tape guides  14  projecting inwardly therefrom, which hold the tape  13  in a position for engagement with the write/read head  21  (shown in FIG. 4) in the write/read mode. In the write/read mode only writing may take place, or only reading, or both. If the top and bottom covers  3  and  4  are not used, the tape guides  14  can be mounted to project inwardly from the frame  2 . The axle  15  for the access door  5  also can be seen as projecting inwardly from the bottom cover  3 .  
         [0049]    In the expanded condition shown in FIG. 2, all of the tape  13  is wound onto one of the tape hubs  7 , with the flange  65  thereof, being rotated approximately perpendicularly to the position shown in FIG. 1, wherein equal amounts of tape  13  are wound on the two hubs  7 . The rotation of the flanges takes place during the initial startup of the transport motion of the tape  13 , with a small amount of friction being present at that time, which is all that is needed to rotate the flanges  18  by approximately one-quarter rotation.  
         [0050]    The internal components of the wide tape drive  16  in accordance with the invention are shown in FIG. 4, with the housing removed. The drive  16  has a base plate  17  to which drive motors  18  are mounted. Each drive motor  18  has a drive shaft  19 . A head positioning assembly  20  is disposed between the drive shafts  19 , and is also mounted to the base plate  17 .  
         [0051]    A wide tape holding assembly  1  of the type shown in FIGS.  1 - 3  is inserted into the drive  16  in a direction proceeding from the lower left corner of FIG. 4, with insertion proceeding toward the base plate  17 . Upon insertion of the wide tape holding assembly  1  into the drive  16 , the drive shafts  19  proceed through the respective access openings  6  and engage the respective tape hubs  7 . Simultaneously, the access door  5  is pushed open by the head positioning assembly  21 , so that the read/write head  21 , carried by the assembly  20 , is positioned to engage the tape  13  between the tape hubs  7 . Mirror-symmetric frame guides  26  are mounted to the base plate  17 , each of these guides  26  carrying a separating mechanism  22 . The separating mechanisms  22 , like the guides  26 , are mirror symmetric. When a wide tape holding assembly  1  of the type shown in FIGS. 1 through 3 is inserted into the drive  16  from a direction proceeding from the lower left corner of FIG. 4 toward the base plate  17 , guide blocks mounted on the guides  26  engage the respective lateral sides of the wide tape holding assembly  1 , and projecting rails  43  and  44  on these blocks respectively engage the grooves  9  in these lateral sides. In each guide block of each guide  26 , between these projecting rails  43  and  44 , is a channel. An interior leg  24  of the separating assembly  22  slides in this channel. Each separating assembly  22  also has an exterior leg  23 , joined to the interior leg  24  by a short section, so as to form a generally U-shaped element, when viewed from above or below as can be seen in FIG. 6 and FIG. 7.  
         [0052]    After the wide tape holding assembly  1  has been manually inserted a certain distance into the drive  16 , the leading side (during insertion) thereof comes to abut against a projection  25  carried by the interior wall  24 . When the wide tape holding assembly  1  has been inserted by this distance, it is in the position relative to the separating assemblies  22  as shown in FIG. 6. The wide tape holding assembly  1  in this position in the drive is also shown in FIG. 5, as seen through the access opening (described below) in the drive  16 . Other components have been removed from FIG. 5, for clarity.  
         [0053]    When the wide tape holding assembly  1  is in the position shown in FIG. 6, gripper elements  40 , each carrying a gripper hook  42 , engage the respective access openings  8  in the lateral sides of the frame  2  of the wide tape holding assembly  1 . As shown in detail  6 A, each gripper element  40  is disposed at the distal end of the inner wall  24  of the separating assembly  22 , which is biased in the manner of a leaf spring so as to normally urge the gripper head  40  outwardly. As the wide tape holding assembly  1  is further pushed into the drive  16 , the separator assemblies  22  are also pushed relative to the guides  26 , by virtue of the abutment of the wide tape holding assembly  1  against the projections  25 . This causes the gripper head  40  to eventually move against a projecting portion  41  of each guide  26  (only one thereof being shown in FIG. 6). This forces the gripper hook  42  of the gripper head  40  into the access opening  8 . This serves two functions. The engagement of the gripper hook  42  in the opening  8  positively engages the inserted wide tape holding assembly  1  with each of the separator assemblies  22 . Secondly, the gripper hook  42  has a thickness which is greater than the thickness of the lateral wall of the frame  2 , so that the gripper hook  42  pushes against the projection  12  carried by the bottom cover  3 , which is in registration with, and normally engages, the opening  8 . As noted above, this projection  12  is mounted on a flexible flap of the cover  13 , which has a distal end carrying a flange that engages an opening in the top cover  4 . When the gripper hook  42  presses on the projection  12  through the opening  8 , it not only disengages the projection  21  from the access opening  8 , thereby freeing the snap connection between the frame  2  and the bottom cover  3 , but it also flexes the flap on which the projection  12  is mounted, thereby also disengaging the flange at the distal end thereof from the opening in the top cover  4 , thereby freeing the top cover  4  from the frame  2 .  
         [0054]    As shown in FIG. 4 and FIG. 12, a bottom edge of the exterior wall  23  of each separating assembly  22  forms a toothed rack, which engages a gear  33  which, in turn, engages a drive gear  34  of a motor  35  (see FIGS. 8 and 12). Since the separator assemblies  22  are being manually pushed due to the abutment of the wide tape holding assembly  1  with the projections  25 , this begins to cause rotation of the gear  33  which in turn begins to cause the drive gear  34  to be rotated. This slight rotation is sensed within the motor  35  and actuates the motor  35  to complete pulling the wide tape holding assembly  1 , which is now positively engaged with the separator assemblies  22 , into the drive  16 , so that the drive shafts  19  become fully mechanically engaged with the tape hubs  7 .  
         [0055]    Each separator assembly  22  also includes an upper lifter  27  and a lower lifter  28 . The upper lifter  27  is pivotably mounted to the guide  26  by levers  29  and  30 , and the lower lifter  28  is pivotably mounted to the guide  26  by levers  31  and  32  (the lever  32  not being visible in FIG. 4, but being visible in FIG. 12). Each of the levers  29 ,  30 ,  31  and  32  has one end mounted by an axle to the guide  26  and an opposite end mounted by an axle to the respective lifter  27  or  28 . The upper lifter  27  has a pin or roller  36  which proceeds through the guide  26  and engages an upper slot in the outer wall  23  of the separator assembly  22 . Similarly, the lower lifter  28  has a pin or roller  37  which proceeds through the guide  26  and engages a mirror-symmetric lower slot in the outer wall  23 . Each of these slots in the outer wall  23  has a relatively long horizontal portion connected to a relatively short horizontal portion by a vertical portion. For most of the insertion procedure the pins  36  and  37  respectively slide in the long horizontal portions of the slots, so that the lifters  27  and  28  follow the grooves  9  in the lateral sides of the wide tape holding assembly  1 , with the wide tape holding assembly  1  being retained in the assembled condition shown in FIG. 1. Shortly after the aforementioned operation of the gripper heads  40  that releases the snap connection, thereby freeing the covers  3  and  4  from the frame  2 , the continuing insertion, now controlled by the motor  35  pulling the separator assemblies  22 , with the wide tape holding assembly  1  engaged therewith, toward the base plate  7 , causes the pins  36  and  37  to reach the respective vertical portions of the slots in the respective outer walls  23 , thereby causing the pins  36  and  37  to move apart, and thereby causing the upper and lower lifters  27  and  28  to pivot on their respective levers. This forces the freed bottom cover  3  and top cover  4  away from the frame  2 , so that the wide tape holding frame  1  comes to a fully inserted position, as shown in FIGS. 11 and 12, whereby the top and bottom of the frame  2  are completely open (uncovered).  
         [0056]    It is then possible, if necessary, for all of the tape  13  to be wound onto one tape pack, such as the tape pack  66  shown in FIG. 11, on one tape hub  7 . This tape pack  66  has a diameter which exceeds the height of the frame  2 , but this is permitted due to the removal of the covers  3  and  4  when the wide tape holding assembly  1  is in the drive  16 . Respective light transmitters/receivers  38  disposed in the drive  16  in registration with the sight openings  11  detect the orientation of the flange  65 . Another detector  68 , as shown in FIG. 4, which may be an optical detector or a sonic detector, detects the position of the slider  41 , or more precisely detects the position of the projection  43  thereof, so as to enable or disenable writing of data on the tape  13 .  
         [0057]    As shown in FIG. 8, the drive  16  also includes a cleaning assembly, formed by a cleaning assembly motor  45  having a drive shaft terminating in drive worm  46 , which engages a worm gear  47  that is connected to a shaft  48 , which carries a cleaning brush  49 . In FIG. 8, the base plate  17  has been removed for clarity, however, all of these components are suitably mounted to the base plate  17  as shown in FIG. 12. When the read/write head  21  is moved by the head positioning assembly  20  to the position shown in FIG. 8, it can be cleaned by operating the motor  45  to rotate the brush  49 . The read/write head may be simultaneously moved by the head positioning assembly  20  while the brush  49  rotates.  
         [0058]    A first embodiment of the head positioning assembly  20  is shown in FIGS. 8, 9,  11  and  12 . In this embodiment, the head  21  moves on rollers  67  (see FIG. 11) between support rods  50  and  51 , which are held in a bracket  17   a  attached to the backside of the base plate  17 . The rods  50  and  51  are connected at their opposite end by a connecting plate  52 .  
         [0059]    The rod  51  has a pulley  54  at the end thereof adjacent to the connecting plate  52 . A thin cable  53 , which may be a steel cable, for example, is entrained around the pulley  54  as well as around a drive pulley  55  operated by a head positioning motor  56 . The cable  53  can be wound in several turns around the drive pulley  54  to avoid slippage.  
         [0060]    The head positioning motor  56  can be a stepper motor with a resolution of 400 steps/revolution, as is standard for several types of commercially available stepper motors. If the drive pulley  55  has a diameter of 6 mm, the head  21  will move 47 microns/step. The drive  16 , however, is intended to have a resolution of approximately 1 micron, and therefore a suitable fine positioning mechanism is additionally required. Such fine positioning mechanisms are known or can easily be devised. One example is to dispose a piezo-actuator in the connection between the head  21  and the cable  53 . Another alternative is to employ suitable gearing between the motor  56  and the drive pulley  55 .  
         [0061]    An electrical cable  60  for providing all suitable electrical connections to the head  21  is also shown in FIGS. 10 and 12.  
         [0062]    Another embodiment of the head positioning assembly  20  is shown in FIG. 10. In this embodiment a stiff steel ribbon  64  is connected to the head  21 , which rides between supporting rods  50  and  51   a  in the manner described in connection with the previous embodiment. The opposite end of the ribbon  64  proceeds through a nip between drive rollers  62  and  63 . The drive roller  62  is driven by a head positioning motor  61 , which can be of the same specifications as the motor  56 . The ribbon  64  is sufficiently stiff so that it can pull as well as push the head  21  between the supporting rods  50  and  51   a . A fine positioning mechanism as described above also can be used to augment the embodiment of FIG. 10.  
         [0063]    Sectional views of the wide tape holding frame  1  in the inventive drive are shown in FIGS. 11 and 12. As can be seen in those figures, the drive has an exterior housing  57  with one wall formed by a front bezel  58 . The bezel  58  has hinged doors  59  (commonly referred to as “saloon doors”) allowing insertion of the wide tape holding frame  1  into the drive, as well as ejection therefrom.  
         [0064]    When the wide tape holding frame  1  in the drive is to be ejected, the above-described procedure operates in a reverse sequence compared to that described above. The motors  35 , for example, are caused to operate in the reverse direction by actuation of an “eject” button (not shown) in a known manner. Of course, optical and sonic controls alternatively can be used.  
         [0065]    Although modifications and changes may be suggested by those skilled in the art, it is the intention of the inventors to embody within the patent warranted hereon all changes and modifications as reasonably and properly come within the scope of their contribution to the art.