U.S. patent application number 09/160239 was filed with the patent office on 2002-04-18 for disk drive comprising a holder unit and chassis unit.
Invention is credited to ARIYOSHI, YUJI.
Application Number | 20020044377 09/160239 |
Document ID | / |
Family ID | 17397870 |
Filed Date | 2002-04-18 |
United States Patent
Application |
20020044377 |
Kind Code |
A1 |
ARIYOSHI, YUJI |
April 18, 2002 |
DISK DRIVE COMPRISING A HOLDER UNIT AND CHASSIS UNIT
Abstract
The object is to improve the productivity and serviceability in
the assembling work by exalting the assembling performance of a
disk drive for the further compacting of the disk drive. The disk
drive is provided with a recording and reproducing unit for
recording or reproducing information on a minidisk encased in a
disk cartridge, a holder for guiding and holding the disk cartridge
that is being inserted, a slider capable of transferring the disk
cartridge between a mounting and dismounting position and an
insertion completed position, drive mechanisms capable of driving
the slider and a chassis that serves as a mounting base for these
principal components of the disk drive. The disk drive is
constructed of two units of a holder unit obtained by mounting the
slider on the holder and a chassis unit obtained by mounting the
recording and reproducing unit and the drive mechanism on the
chassis. The holder unit is assembled with the chassis pivotally in
the vertical direction in a state in which the transfer member and
the drive mechanism are engaged with each other in the vertical
direction.
Inventors: |
ARIYOSHI, YUJI;
(TOYONAKA-SHI, JP) |
Correspondence
Address: |
WENDEROTH LIND & PONACK
SUITE 800
2033 K STREET N W
WASHINGTON
DC
20006
|
Family ID: |
17397870 |
Appl. No.: |
09/160239 |
Filed: |
September 25, 1998 |
Current U.S.
Class: |
360/99.06 |
Current CPC
Class: |
G11B 17/046
20130101 |
Class at
Publication: |
360/99.06 |
International
Class: |
G11B 017/02 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 29, 1997 |
JP |
9-264051 |
Claims
What is claimed is:
1. A disk drive comprising: a recording and reproducing unit for
recording information on a recording and/or reproducing medium
encased in a disk cartridge or reproducing the information recorded
on the medium; a holder for guiding and holding the disk cartridge
that is being inserted; a transfer member for transferring the disk
cartridge between a mounting and dismounting position where the
disk cartridge can be mounted on and dismounted from the holder and
an insertion completed position where the disk cartridge is
completely inserted in the holder; a drive mechanism capable of
driving the transfer member; and a chassis that serves as a
mounting base for these principal components, the disk drive being
constructed of two units of a holder unit obtained by mounting the
transfer member on the holder and a chassis unit obtained by
mounting the recording and reproducing unit and the drive mechanism
on the chassis, the chassis being provided with a pivot support
portion for supporting the holder pivotally in the vertical
direction, the transfer member and the drive mechanism being
provided with engagement portions to be engaged with each other in
the vertical direction, and the holder unit being assembled with
the chassis pivotally in the vertical direction in a state in which
the transfer member and the drive mechanism are engaged with each
other in the vertical direction.
2. A disk drive as claimed in claim 1, wherein a first cam element
is provided on the chassis unit side, a second cam element to be
coupled with the first cam element is provided on the holder unit
side and the holder unit is assembled with the chassis, whereby
both the cam elements are coupled with each other in the vertical
direction, forming a cam mechanism for vertically moving the disk
cartridge between the insertion completed position and the
recording and reproducing position of the recording and reproducing
unit.
3. A disk drive comprising: a recording and reproducing unit for
recording information on a recording and/or reproducing medium
encased in a disk cartridge or reproducing the information recorded
on the medium; a holder for guiding and holding the disk cartridge
that is being inserted; a transfer member for transferring the disk
cartridge between a mounting and dismounting position where the
disk cartridge can be mounted on and dismounted from the holder and
an insertion completed position where the disk cartridge is
completely inserted in the holder; a vertical movement mechanism
for vertically moving the disk cartridge between the insertion
completed position and the recording and reproducing position of
the recording and reproducing unit; a drive mechanism capable of
driving the transfer member and the vertical movement mechanism;
and a chassis that serves as a mounting base for these principal
components, the drive mechanism comprising: first and second rack
members that are slidably arranged opposite to each other on the
chassis; a drive gear that is arranged between both the rack
members and is able to mesh with a toothed portion of each of the
rack members; and a switch lever that can engage with both the rack
members and switches a state of meshing of the toothed portion of
each of the rack members with the drive gear, the first rack member
being provided with a first engagement portion to be engaged with
the transfer member, the second rack member being provided with a
second engagement portion that serves as part of the vertical
movement mechanism, whereby either one of the rack members is made
to slide to a specified position by rotation of the drive gear
meshed with the toothed portion thereof and thereafter the switch
lever effects switching so that the toothed portion of the other
rack member meshes with the drive gear, consequently sliding the
other rack member to a specified position in a direction opposite
to the direction in which the one rack member slides.
4. A disk drive as claimed in claim 3, wherein, when the disk
cartridge is loaded from the mounting and dismounting position to
the recording and reproducing position, the first rack member is
driven by the drive gear to slide to a specified position
corresponding to the insertion completed position of the disk
cartridge and thereafter the switch lever effects switching so that
the toothed portion of the second rack member meshes with the drive
gear, consequently sliding the second rack member to a specified
position corresponding to the recording and reproducing position of
the disk cartridge.
5. A disk drive as claimed in claim 4, wherein the second rack
member is provided with a third engagement portion to be engaged
with a support member side of a magnetic head of the recording and
reproducing unit and the second rack member is made to slide to the
specified position corresponding to the recording and reproducing
position of the disk cartridge and thereafter made to slide further
in the same direction, consequently driving the support member to
set the magnetic head into a recordable state.
Description
BACKGROUND OF THE INVENTION
[0001] The present invention relates to disk drives, and more
particularly, to a disk drive which is applied to a disk of, for
example, the so-called MD (minidisk) or the like including a
recording and/or reproducing medium encased in a disk cartridge and
is provided for recording information on the medium or reproducing
the information recorded on the medium.
[0002] As a disk drive to be applied to a disk of, for example, the
so-called MD (minidisk) or the like including a recording and/or
reproducing medium encased in a disk cartridge, there has
conventionally been generally known a disk drive provided with a
recording and reproducing unit for recording information on the
recording and/or reproducing medium encased in a disk cartridge or
reproducing the information recorded on the medium, a holder for
guiding and holding the disk cartridge that is being inserted, a
loading mechanism capable of transferring the disk cartridge
between a mounting and dismounting position where the disk
cartridge can be mounted on and dismounted from the holder and a
recording and reproducing position of the recording and reproducing
unit, a drive mechanism capable of driving the loading mechanism
and a chassis that serves as a mounting base for these principal
components of the disk drive. For example, the prior art references
of Japanese Patent Laid-Open Publication No. HEI 6-267124, Japanese
Patent Laid-Open Publication No. HEI 8-102118, Japanese Patent
Laid-Open Publication No. HEI 8-171765 and Japanese Patent
Laid-Open Publication No. HEI 8-180625 and so on disclose the
detailed constructions of such a disk drive.
[0003] In the above disk drive, the principal components of the
recording and reproducing unit, holder, loading mechanism and drive
mechanism are finally fixed and supported by or engaged with the
chassis directly or indirectly to be assembled into a finished
product.
[0004] However, most of the above principal components themselves
are constructed of many elements, and in order to assure accurate
and smooth operation, a very high accuracy is required for the
above principal components and their assembled state in such a disk
drive. Therefore, a lot of processes are required for assembling
them as a finished product, and this has led to the drawback that
much labor and time are necessary for the assembling work.
[0005] The disk drive of the above type is constructed by
assembling many elements as described above. Therefore, the
structure is inevitably complicated, and in performing maintenance
work for service, it is very hard to perform disassembling and
reassembling of the assembled finished product.
[0006] On the other hand, with regard to the size of the disk
drive, there is a demand for further compacting of the disk drive
concerning not only the portable types but also those that are
assembled into audio devices for home use and on-board automobile
use.
SUMMARY OF THE INVENTION
[0007] The present invention has been made in view of the
aforementioned conventional technical problems and has an object to
improve the productivity and serviceability in the assembling work
by exalting the assembling performance of a disk drive, for the
further compacting of the disk drive.
[0008] According to a first aspect of the present invention, there
is provided a disk drive comprising: a recording and reproducing
unit for recording information on a recording and/or reproducing
medium encased in a disk cartridge or reproducing the information
recorded on the medium; a holder for guiding and holding the disk
cartridge that is being inserted; a transfer member (slider) for
transferring the disk cartridge between a mounting and dismounting
position where the disk cartridge can be mounted on and dismounted
from the holder and an insertion completed position where the disk
cartridge is completely inserted in the holder; a drive mechanism
which has an electric motor and an output trasmission mechanism
thereof and is capable of driving the transfer member; and a
chassis that serves as a mounting base for these principal
components, the disk drive being constructed of two units of a
holder unit obtained by mounting the transfer member on the holder
and a chassis unit obtained by mounting the recording and
reproducing unit and the drive mechanism on the chassis, the
chassis being provided with a pivot support portion for supporting
the holder pivotally in the vertical direction, the transfer member
and the drive mechanism being provided with engagement portions to
be engaged with each other in the vertical direction, and the
holder unit being assembled with the chassis pivotally in the
vertical direction in a state in which the transfer member and the
drive mechanism are engaged with each other in the vertical
direction.
[0009] By adopting this construction, the final assembling of the
disk drive can be achieved by the simple work of supporting the
pivot of the holder by the pivot support of the chassis and
pivoting downward the holder while engaging the transfer member
with the drive mechanism in the vertical direction. That is, the
holder unit can be assembled with the chassis unit only by the
pivot operation, and both the units are engaged with each other by
only one portion. Therefore, the assembling work (as well as the
disassembling work) of both the units can be very easily
achieved.
[0010] According to a second aspect of the present invention, based
on the above first aspect of the present invention, a first cam
element is provided on the chassis unit side, a second cam element
to be coupled with the first cam element is provided on the holder
unit side and the holder unit is assembled with the chassis,
whereby both the cam elements are coupled with each other in the
vertical direction, forming a cam mechanism for vertically moving
the disk cartridge between the insertion completed position and the
recording and reproducing position of the recording and reproducing
unit.
[0011] With this arrangement, the vertical movement mechanism can
be provided with a relatively simple construction. By descending
the disk cartridge by the cam mechanism from the insertion
completed position to the recording and reproducing position in
addition to the transfer of the disk cartridge from the mounting
and dismounting position to the insertion completed position by the
transfer member, a loading operation sequence can be performed. In
this case, both the cam elements are coupled with each other in the
vertical direction, and therefore, the pivot operation of the
holder unit in assembling the holder unit with the chassis is not
hindered.
[0012] Furthermore, according to a third aspect of the present
invention, there is provided a disk drive comprising: a recording
and reproducing unit for recording information on a recording
and/or reproducing medium encased in a disk cartridge or
reproducing the information recorded on the medium; a holder for
guiding and holding the disk cartridge that is being inserted; a
transfer member (slider) for transferring the disk cartridge
between a mounting and dismounting position where the disk
cartridge can be mounted on and dismounted from the holder and an
insertion completed position where the disk cartridge is completely
inserted in the holder; a vertical movement mechanism for
vertically moving the disk cartridge between the insertion
completed position and the recording and reproducing position of
the recording and reproducing unit by a cam mechanism; a drive
mechanism capable of driving the transfer member and the vertical
movement mechanism; and a chassis that serves as a mounting base
for these principal components, the drive mechanism comprising:
first and second rack members that are slidably arranged opposite
to each other on the chassis; a drive gear that is arranged between
both the rack members and is able to mesh with a toothed portion of
each of the rack members; and a switch lever that can engage with
both the rack members and switches a state of meshing of the
toothed portion of each of the rack members with the drive gear,
the first rack member being provided with a first engagement
portion to be engaged with the transfer member, the second rack
member being provided with a second engagement portion that serves
as part of the vertical movement mechanism, whereby either one of
the rack members is made to slide to a specified position by
rotation of the drive gear meshed with the toothed portion thereof
and thereafter the switch lever effects a switching operation so
that the toothed portion of the other rack member meshes with the
drive gear, consequently sliding the other rack member to a
specified position in a direction opposite to the direction in
which the one rack member slides.
[0013] In this case, the two rack members that have different roles
can be driven in the opposite directions by the one drive gear, and
the switch lever switches the state of meshing of this drive gear
with the toothed portion of each of the rack members, thereby
allowing the rack members to be each driven with an appropriate
timing. With this arrangement, the structure can be simplified and
compacted in terms of size as compared with the case where the
above two rack members are separately provided. Particularly, the
disk drive can be compacted in size in the transfer direction of
the disk cartridge.
[0014] Furthermore, according to a fourth aspect of the present
invention, based on the above third aspect of the present
invention, when the disk cartridge is loaded from the mounting and
dismounting position to the recording and reproducing position, the
first rack member is driven by the drive gear to slide to a
specified position corresponding to the insertion completed
position of the disk cartridge and thereafter the switch lever
effects a switching operation so that the toothed portion of the
second rack member meshes with the drive gear, consequently sliding
the second rack member to a specified position corresponding to the
recording and reproducing position of the disk cartridge.
[0015] In this case, the slide operation of both the rack members
is switched in accordance with an appropriate timing, by which the
transfer of the disk cartridge from the mounting and dismounting
position to the insertion completed position and the descending
operation from this insertion completed position to the recording
and reproducing position are performed as a loading operation
sequence.
[0016] Furthermore, according to a fifth aspect of the present
invention, based on the above fourth aspect of the present
invention, the second rack member is provided with a third
engagement portion to be engaged with a support member side of a
magnetic head of the recording and reproducing unit and the second
rack member is made to slide to the specified position
corresponding to the recording and reproducing position of the disk
cartridge and thereafter made to slide further in the same
direction, consequently driving the support member to set the
magnetic head into a recordable state. In this case, a further role
is assigned to the second rack member, so that the further
compacting of the disk drive can be achieved.
[0017] In the first aspect of the present invention, the disk drive
is constructed of the two units of the holder unit and the chassis
unit, and the holder unit is assembled with the chassis pivotally
in the vertical direction in the state in which the transfer member
and the drive mechanism are engaged with each other in the vertical
direction. With this arrangement, the final assembling of the disk
drive can be achieved by the simple work of supporting the pivot of
the holder by the pivot support of the chassis and pivoting
downward the holder while engaging the transfer member with the
drive mechanism in the vertical direction. That is, the holder unit
can be assembled with the chassis unit only by the pivot operation,
and both the units are engaged with each other by only one portion.
Therefore, the assembling work (as well as the disassembling work)
of both the units can be very easily achieved.
[0018] As a result, the productivity in the assembling work of the
disk drive can be remarkably improved. Furthermore, the
serviceability is also remarkably improved.
[0019] Also, in the second aspect of the present invention,
basically the same effect as that of the above first aspect of the
present invention can be produced. Furthermore, by assembling the
holder unit with the chassis, the first cam element provided on the
chassis unit side and the second cam element provided on the holder
unit side are coupled with each other in the vertical direction,
consequently forming the cam mechanism for vertically moving the
disk cartridge between the insertion completed position and the
recording and reproducing position of the recording and reproducing
unit. Therefore, the vertical movement mechanism can be provided
with a relatively simple construction. By descending the disk
cartridge by the cam mechanism from the insertion completed
position to the recording and reproducing position in addition to
the transfer of the disk cartridge from the mounting and
dismounting position to the insertion completed position by the
transfer member, a loading operation sequence can be performed.
[0020] In this case, both the cam elements are coupled with each
other in the vertical direction, and therefore, the pivot operation
of the holder unit in assembling the holder unit with the chassis
is not hindered.
[0021] Furthermore, in the third aspect of the present invention,
the first rack member provided with the first engagement portion to
be engaged with the transfer member and the second rack member
provided with the second engagement portion that serves as part of
the vertical movement mechanism are slidably arranged oppositely to
each other on the chassis. The drive gear is arranged between both
these rack members, and the switch lever for switching the state of
meshing of the toothed portion of each of the rack members with the
drive gear is provided while being able to engage with both the
rack members. Either one of the rack members is made to slide to
the specified position by the rotation of the drive gear and
thereafter the switch lever effects a switching operation so that
the toothed portion of the other rack member meshes with the drive
gear, consequently sliding the other rack member to the specified
position in the direction opposite to the direction in which one
rack member slides. Therefore, the two rack members that originally
have different roles can be driven in the opposite directions by
the one drive gear, and the state of meshing of this drive gear
with each of the rack members is switched by the switch lever,
thereby allowing the rack members to be each driven with an
appropriate timing.
[0022] With this arrangement, the structure can be simplified and
compacted in terms of size as compared with the case where the
above two rack members are separately provided. Particularly, the
disk drive can be compacted in size in the transfer direction of
the disk cartridge.
[0023] Furthermore, in the fourth aspect of the present invention,
basically the same effect as that of the above third aspect of the
present invention can be produced. Particularly, when the disk
cartridge is loaded from the mounting and dismounting position to
the recording and reproducing position, the first rack member is
made to slide to the specified position corresponding to the
insertion completed position of the disk cartridge and thereafter
the switch lever effects a switching operation to slide the second
rack member to the specified position corresponding to the
recording and reproducing position of the disk cartridge. With this
arrangement, the slide operation of both the rack members is
switched in accordance with an appropriate timing, by which the
transfer of the disk cartridge from the mounting and dismounting
position to the insertion completed position and the descending
operation from this insertion completed position to the recording
and reproducing position can be performed as a loading operation
sequence.
[0024] Furthermore, in the fifth aspect of the present invention,
basically the same effect as that of the above fourth aspect of the
present invention can be produced. Moreover, the second rack member
is provided with the third engagement portion to be engaged with
the support member side of the magnetic head of the recording and
reproducing unit. The second rack member is made to slide to the
specified position corresponding to the recording and reproducing
position of the disk cartridge and thereafter made to slide further
in the same direction, thereby driving the support member to set
the magnetic head into the recordable state. With this arrangement,
a further role is assigned to the second rack member, so that the
further compacting of the disk drive can be achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] FIG. 1 is an overall perspective view of a disk drive
according to an embodiment of the present invention;
[0026] FIG. 2 is an exploded perspective view of the holder unit
and the chassis unit of the above disk drive;
[0027] FIG. 3 is an explanatory side view of the above disk drive
in the assembled state;
[0028] FIG. 4 is an explanatory plan view of the above holder
unit;
[0029] FIG. 5 is an explanatory plan view of the above chassis
unit;
[0030] FIG. 6 is an explanatory plan view showing an associated
state in which a slider of the above holder unit is associated with
a drive mechanism of the chassis unit;
[0031] FIG. 7 is an explanatory side view showing an associated
state in which the slider of the above holder unit is associated
with the drive mechanism of the chassis unit;
[0032] FIG. 8 is an explanatory side view showing an insertion
start state when the above disk cartridge is being inserted into
the holder;
[0033] FIG. 9 is an explanatory side view showing an insertion
completed state when the above disk cartridge is inserted in the
holder;
[0034] FIG. 10 is an explanatory side view showing a recording and
reproducing enabled state when the above disk cartridge is inserted
in the holder;
[0035] FIG. 11 is an explanatory plan view showing a lock lever
disengaged state when the above disk cartridge is inserted in the
holder;
[0036] FIG. 12 is an explanatory plan view showing a lock lever
engaged state when the above disk cartridge is inserted in the
holder;
[0037] FIG. 13 is an explanatory plan view showing the insertion
completed state in which the above disk cartridge is inserted in
the holder;
[0038] FIG. 14 is an explanatory plan view showing an operation
state in which a main rack and a sub-rack operate in a disk
cartridge mounting and dismounting position;
[0039] FIG. 15 is an explanatory plan view showing an operation
state in which the main rack and the sub-rack operate in a disk
cartridge insertion completed position;
[0040] FIG. 16 is an explanatory plan view showing an operation
state in which the main rack and the sub-rack operate in a disk
cartridge reproducible position;
[0041] FIG. 17 is an explanatory plan view showing an operation
state in which the main rack and the sub-rack operate in a disk
cartridge recordable position; and
[0042] FIG. 18 is an overall perspective view of the above disk
cartridge.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0043] Preferred embodiments of the present invention will be
described in detail below with reference to the accompanying
drawings.
[0044] FIG. 1 is an overall perspective view of a disk drive 1
according to an embodiment of the present invention. As shown in
this figure, the disk drive 1 (occasionally referred to simply as a
"unit" hereinafter) is basically constructed of a holder unit 10
provided with a holder 11 for encasing and holding a disk cartridge
60 (occasionally referred to simply as a "cartridge" hereinafter)
in which the so-called minidisk (MD) that serves as a recording
and/or reproducing medium is encased and a chassis unit 30 provided
with a flat-plate-shaped chassis 31 that serves as a mounting base
for the principal components of the unit 1. The holder unit 10 is
supported pivotally in the vertical direction with respect to the
chassis unit 30 about a portion near the end portion on the side
opposite to the cartridge insertion side, as described later.
[0045] The construction of these units 10 and 30 and the operation
of the disk drive 1 will be successively described below.
[0046] FIG. 2 is an exploded perspective view of the holder unit 10
and the chassis unit 30. FIG. 3 is an explanatory side view of the
whole body of the disk drive in the assembled state. FIG. 4 is an
explanatory plan view of the holder unit 10. FIG. 5 is an
explanatory plan view of the chassis unit 30. FIG. 6 is an
explanatory plan view showing an associated state in which a
loading mechanism of the holder unit 10 is associated with a drive
mechanism of the chassis unit 30. FIG. 7 is an explanatory side
view showing the associated state of FIG. 6. It is to be noted that
the construction of the disk cartridge 60 is shown in the
perspective view of FIG. 18.
[0047] The construction of the holder unit 10 will be described
first.
[0048] This holder unit 10 has the holder 11 that serves as the
main body of the holder unit 10 and guides, receives and holds the
disk cartridge 60 that is being inserted, and this holder 11 is
basically mounted with a slider 12 that transfers the disk
cartridge 60 that is being inserted into the unit 1, a lock lever
13 for locking and unlocking the disk cartridge 60 that is being
inserted with respect to the slider 12 and a shutter opener 15 for
opening and closing a shutter 61 of the cartridge 60. It is to be
noted that the holder 11 corresponds to the holder stated in the
claims of the present application.
[0049] The holder 11 has one end provided with an opening 11a for
receiving the disk cartridge 60 and the other end provided with a
pair of pivot pins 11b and 11c (only the pivot pin 11b on one side
is shown in FIG. 1 and FIG. 2) that serve as pivots for a pivoting
operation in the vertical direction of the holder 11 while
projecting laterally outward.
[0050] The bottom surface of the holder 11 is provided with an
engagement projection 11d to be engaged with a drive mechanism
capable of driving a loading mechanism including the slider 12 as
described later. It is to be noted that the drive mechanism is
provided on the chassis unit 30.
[0051] The slider 12 has a hook portion 12a (see FIG. 4) on the
lower surface side, and this hook section 12a is slidably engaged
with an elongated groove 11s cut in the holder 11. This elongated
groove 11s extends in a direction in which the cartridge 60 is
inserted or ejected (the direction of arrow A/B shown in FIG. 4),
and the hook section 12a (i.e., the slider 12) can move in the
above direction (direction A/B) within the range of this elongated
groove 11s.
[0052] The disk cartridge 60 being inserted from the holder opening
11a is transferred into the unit 1 in accordance with the movement
of this slider 12.
[0053] The slider 12 is provided with an engagement pin 12b that
has a specified length and extends downward, and as described
later, this engagement pin 12b comes into engagement with the drive
mechanism on the chassis unit 30 side.
[0054] It is to be noted that this slider 12 is to transfer the
disk cartridge 60 between the mounting and dismounting position
where the cartridge can be mounted and dismounted from the holder
11 and an insertion completed position where the cartridge is
completely positioned with respect to the holder 11. The slider 12
corresponds to the transfer member as disclosed in the claims of
the present application, and constitutes part of the loading
mechanism capable of transferring the cartridge between the above
mounting and dismounting position and a recording and reproducing
position of the recording and reproducing unit (described later) as
disclosed in the claims of the present application.
[0055] The lock lever 13 has a hook portion 13a on the lower
surface side, and this hook portion 13a is slidably engaged with an
elongated groove 12s cut in the slider 12. This elongated groove
12s extends in the insertion/ejection direction (direction A/B, see
FIG. 4) of the cartridge 60 in a state in which the slider 12 is
assembled with the holder 11. The hook portion 13a (i.e., the lock
lever 13) is able to move in the above direction (direction A/B)
within the range of this elongated groove 12s and is able to pivot
around a center Pf of the hook portion 13a (i.e., in the direction
of arrow C/D shown in FIG. 4).
[0056] This lock lever 13 is always urged in the direction of arrow
C by a spring 14 (lock lever spring) mounted around a pin 12c
projecting on the upper surface side of the slider 12. Further, a
lock pawl 13b for pulling and retaining the cartridge 60 is
provided on the leading end side of the lock lever 13 while being
engaged with a side recess 60a provided on one side surface of the
disk cartridge 60.
[0057] The shutter opener 15 has an engagement hook portion 15a to
be engaged with a shutter hole 61a bored in the shutter 61 of the
disk cartridge 60 and is mounted and fixed relatively close to the
cartridge insertion side end portion of the side portion of the
holder 11.
[0058] On a side portion of this holder 11 is formed a window 11e
relatively close to the cartridge insertion side end portion, and
the shutter opener 15 is mounted so that its hook portion 15a
projects inwardly of the window 11e.
[0059] When the disk cartridge 60 is inserted from the opening 11a
into the holder 11, the engagement hook portion 15a of the shutter
opener 15 comes into engagement with the shutter hole 61a of the
cartridge 60, by which the shutter 61 is opened in accordance with
the progress of the inserting operation of the cartridge 60.
[0060] The chassis unit 30 will be described next.
[0061] This chassis unit 30 is provided with a flat-plate-shaped
chassis 31 that serves as the mounting base of the principal
components of the disk drive of the disk drive 1, and this
flat-plate-shaped chassis 31 is mounted with a recording and
reproducing unit 32 for recording information on a recording and/or
reproducing medium encased in the disk cartridge 60 or reproducing
the information recorded on the medium, a head shifter 33 for
vertically moving a magnetic head 32a of the recording and
reproducing unit 32, a drive mechanism capable of driving the
loading mechanism including the slider 12 provided for the holder
unit 10 and so on.
[0062] As described above, the holder 11 is also supported
pivotally around the pivot pins 11b and 11c provided at the end
portion oppositely to the opening side in the vertical direction
with respect to the flat-plate-shaped chassis 31.
[0063] The flat-plate-shaped chassis 31 is obtained by cutting a
steel plate material of, for example, a specified thickness into a
specified planar shape (rectangular shape in the present
embodiment) by a shearing process or the like and punching a
plurality of holes 31h and cut portions 31n through specified
portions of the plate material. The plate material is subjected to
neither bending process nor emboss process, and therefore, the
planar portion remains flat.
[0064] That is, more preferably, the flat-plate-shaped chassis 31
is set to a specified thickness and the base portion except for the
hole 31h and the cut portion 31n is formed flat throughout the
entire surface. Therefore, as compared with the conventional case
of the bending process or the like, the construction itself of the
chassis 31 is substantially simplified, and the dimensional
(thickness) accuracy and form (flatness) accuracy are also
remarkably improved. Therefore, the accuracy of the assembled state
of the principal components can be very easily assured, so that the
high-accuracy operation of the disk drive 1 can be guaranteed
without specifically necessitating troublesome adjustment or the
like. Therefore, the productivity in the assembling work of the
disk drive 1 can be remarkably improved, and the assembling
performance is also remarkably improved.
[0065] At least part of the plurality of holes 31h and/or the cut
portions 31n is used for mounting (fixing, supporting or engaging)
the constituent elements of the principal components of the disk
drive or the other accessory parts on the chassis 31, where the
constituent elements or the other accessory parts are mounted on
the specified holes 31h and/or the cut portions 31n directly or via
a mounting member. Therefore, the constituent elements of the
principal components or the other accessory parts are mounted on
the chassis in a correctly positioned state without any
trouble.
[0066] It is to be noted that the remaining holes 31h and/or the
cut portions 31n, being not used for the mounting of the
constituent elements of the principal components and/or the other
accessory parts play the role of reducing the weight of the
flat-plate-shaped chassis 31 as, for example, through holes 31h
and/or cut portions 31n.
[0067] More preferably, prior to the mounting of the constituent
elements of the principal components of the disk drive and/or the
other accessory parts and/or the their mounting members, the base
portion of the flat chassis 31 except for the holes 31h and the cut
portions 31n is subjected to the so-called leveling process. As is
well known, this leveling process uses a leveling unit (the
so-called leveler) provided with a pair of pressure rollers
arranged at specified regular intervals and controls the thickness
dimension and flatness of the plate material with extremely high
accuracy by leveling the thickness and surface of the plate
material by making the plate pass through the space between the
pressure rollers. By subjecting the chassis 31 to this leveling
process, the thickness dimension and the flatness of the chassis 31
can be stably controlled with higher accuracy.
[0068] Further, more preferably, the constituent elements of the
principal components and/or the other accessory parts and/or their
mounting members are made of synthetic resin and are integrally
formed with the chassis 31 by outsert molding subsequently to the
leveling process.
[0069] This outsert molding is to integrally form the mounting
holes 31h and/or cut portions 31n of the chassis 31 with the
specified elements by preparing a pair of molds provided with a
molding cavity corresponding to the necessary elements (the
constituent elements of the principal components and/or the other
accessory parts and/or their mounting members), putting the molds
close to each other with the chassis 31 interposed between these
molds and injecting molten resin into the molding cavity. By this
process, the mounting of the constituent elements of the principal
components and/or the other accessory parts and/or their mounting
members on the chassis 31 can be very efficiently performed with
high accuracy without specifically impairing the dimensional
accuracy and form accuracy of the chassis 31.
[0070] Instead of such an outsert molding, it is acceptable to
mount the necessary elements on the corresponding mounting holes
31h and/or the cut portions 31n by screwing or "caulking" or the
like.
[0071] The leveling process and outsert molding are similar to
those which have been conventionally well known, and therefore,
neither detailed description nor illustration thereof is provided
for the processes.
[0072] On the one end side of the flat-plate-shaped chassis 31 are
provided bearing portions 31b and 31c for supporting the pivot pins
11b and 11c of the holder 11. The holder 11 can pivot in the
vertical direction with respect to the flat-plate-shaped chassis 31
with the pivot pins 11b and 11c supported by the bearing portions
31b and 31c.
[0073] The bearing portions 31b and 31c have their upper portions
opening upward, so that the pivot pins 11b and 11c of the holder 11
can be very easily (with a one-touch motion) fitted into the
bearing portions from the opening for the assembling. The bearing
portions 31b and 31c correspond to the "pivot support" stated in
the claim 1 of the present application.
[0074] As an example of the mounting member of the principal
components of the disk drive or the constituent elements, the
bearing portions 31b and 31c can be enumerated. As an example of
the other accessory parts, a pair of plate-shaped engagement
members 31g that are provided on one end side of the chassis 31 and
extend upward as shown in FIG. 2 can be enumerated. The engagement
members 31g are to engage the holder 11 in the assembled state with
the chassis 31.
[0075] An electric motor 34 for driving the loading mechanism is
fixed by a screw member on the lower surface side of the chassis 31
as described later. On the output side of the electric motor 34 is
provided an output transmission mechanism 40 (see FIG. 5) for
transmitting the rotation of the electric motor 34 while reducing
the rotating speed. Below the chassis 31 is arranged a control
board 70 (see FIG. 3) on which a control circuit of the disk drive
1 is formed, and the electric motor 34 is electrically connected to
this control board 70.
[0076] The output transmission mechanism 40 is constructed of a
motor pulley 35 to be fixed on an output shaft 34s of the electric
motor 34, a power transmission belt 36, a pulley gear 37, an
intermediate gear 38, a drive gear 39 and so on. The output of the
electric motor 34 is transmitted via the motor pulley 35 and the
power transmission belt 36 to the pulley gear 37 and thereafter
transmitted to the drive gear 39 via the intermediate gear 38
meshed with a lower gear of the pulley gear 37.
[0077] On both sides of the drive gear 39, in terms of plan view, a
pair of rack members (main rack 41 and sub-rack 42) having a
toothed portion capable of meshing with the drive gear 39 are
arranged opposite to each other, and both the racks 41 and 42 are
slidably held and guided on the chassis 31 by a plurality of guide
hooks 31d (see FIG. 2). With the rotation of the drive gear 39 as
described later, the racks can move in the direction of arrow I/J
shown in FIG. 5.
[0078] A side cam portion 42a is formed on the upper surface of the
side portion on the leading end side of the sub-rack 42, and as
described later, this side cam portion 42a comes into engagement
with the engagement projection 11d of the holder 11 according to
the operation state of the disk drive 1.
[0079] An engagement pin 12b provided at the slider 12 on the
holder unit 10 side is engaged from above with a recess 41a formed
on one end side of the main rack 41.
[0080] The recess 41a of the main rack 41 and the engagement pin
12b of the slider 12 correspond to the "engagement portions that
engage with each other in the vertical direction" stated in the
claim 1 of the present application, and among these, the recess 41a
of the main rack 41 also corresponds to the "first engagement
portion" stated in the claim 3 of the present application.
[0081] The side cam portion 42a of the sub-rack 42 and the
engagement projection 11d of the holder 11 correspond respectively
to the "first cam element" and the "second cam element" stated in
the claim 2 of the present application, and among these, the side
cam portion 42a of the sub-rack 42 also corresponds to the "second
engagement portion" stated in the claim 3 of the present
application. Then, the side cam portion 42a and the engagement
projection 11d constitute the "vertical movement mechanism" stated
in the claims 2 and 3 of the present application.
[0082] Further, the main rack 41 and the sub-rack 42 correspond
respectively to the "first rack member" and the "second rack
member" stated in the claim 3 of the present application.
[0083] In the present embodiment, when assembling the holder unit
10 with the chassis unit 30 in the assembling process of the disk
drive 1, more preferably, basically only the engagement pin 12b of
the slider 12 is to be engaged with the recess 41a of the main rack
41.
[0084] Therefore, by individually sub-assembling the holder unit 10
and the chassis unit 30, thereafter fitting the pivot pins 11b and
11c of the holder 11 into the bearing portions 31b and 31c of the
chassis 31 in a state in which the engagement pin 12b is
preparatorily positioned so as to be fitted in the recess 41a of
the main rack 41 and pivoting the holder 11 downward, the holder
unit 10 can be assembled very easily (with a one-touch motion) with
the chassis unit 30.
[0085] As described above, according to the present embodiment, the
disk drive 1 is constructed of the two units of the holder unit 10
and the chassis unit 30, and the holder 11 is assembled with the
chassis 31 pivotally in the vertical direction in the state in
which the engagement pin 12b of the slider 12 and the recess 41a of
the main rack 41 are engaged with each other in the vertical
direction. Therefore, the final assembling of the disk drive 1 can
be achieved by the simple work of supporting the pivot pins 11b and
11c (pivot) of the holder 11 by the bearing portions 31b and 31c
(pivot support) of the chassis 31 and pivoting downward the holder
11 while engaging the slider 12 with the main rack 41 of the drive
mechanism in the vertical direction. That is, the holder unit 10
can be assembled with the chassis unit 30 only by the pivot
operation, and both the units 10 and 30 are engaged with each other
by only one portion. Therefore, the assembling work (as well as the
disassembling work) of both the units can be very easily
achieved.
[0086] As a result, the productivity in the assembling work of the
disk drive 1 can be remarkably improved. Furthermore, the
serviceability is also remarkably improved.
[0087] Furthermore, by assembling the holder unit 10 with the
chassis 31, the side cam portion 42a (cam surface) that belongs to
the sub-rack 42 and serves as the first cam element provided on the
chassis unit 30 side is engaged in the vertical direction with the
engagement projection 11d (cam slider) that belongs to the holder
11 and serves as the second cam element provided on the holder unit
10 side, thereby constituting a cam mechanism for vertically moving
the disk cartridge 60 between the insertion completed position and
the recording and reproducing position of the recording and
reproducing unit 32. Therefore, the vertical movement mechanism can
be provided with a relatively simple construction, and by
descending the disk cartridge 60 by the cam mechanism from the
insertion completed position to the recording and reproducing
position in addition to the transfer of the disk cartridge from the
mounting and dismounting position to the insertion completed
position by the slider 12, a sequence of a loading operation can be
performed.
[0088] In this case, both the cam elements (side cam portion 42a
and engagement projection 11d) are coupled with each other in the
vertical direction, and therefore, the pivot operation of the
holder unit 10 in assembling the holder unit 10 with the chassis 31
is not hindered.
[0089] Further, between both the rack members 41 and 42 is arranged
a switch lever 43 capable of coming into engagement with both the
members. The switch lever 43 switches over between the main rack 41
and the sub-rack 42 to be used as the counterpart of engagement of
the drive gear 39, and the switch lever 43 is pivotally supported
in the direction K/L (see the arrow of the one-dot chain line in
FIG. 5) on the chassis 31.
[0090] If a projection 41b of the main rack 41 comes into
engagement with a recess 43a provided at one end of the switch
lever 43 to thereby pivot the switch lever 43 in the direction K
(see FIG. 5) in accordance with the shift from the state in which
the toothed portion of the main rack 41 is engaged with the drive
gear 39 in the direction I (see FIG. 5) of the main rack 41, then
the sub-rack 42 starts to operate to mesh the toothed portion
thereof with the drive gear 39 since a pin 43b provided on the
other end side of the switch lever 43 is engaged with a cam groove
42d of the sub-rack 42.
[0091] Consequently, if the main rack 41 moves in the direction I,
then the sub-rack 42, which has been stopped, is moved in the
direction J by the switch lever 43 in the vicinity of the terminal
end of the movement.
[0092] The head shifter 33 that serves as a support member of the
magnetic head 32a of the recording and reproducing unit 32 can
arbitrarily pivot in the vertical direction, since a pair of pins
31e of the chassis 31 are inserted in a pair of holes 33a (see FIG.
2) provided on the rear side of the head shifter 33. Then, by this
pivot operation, the magnetic head 32a of the recording and
reproducing unit 32 are pivoted in the vertical direction. Below a
side of this magnetic head 32a is positioned a turntable 32b.
[0093] On the side portion of the head shifter 33 is provided an
arm 33b which is placed on an upper cam portion 42c of the sub-rack
42, and the arm 33b moves on the upper cam portion 42c while being
linked with the operation of the sub-rack 42, by which the arm 33b
(i.e., the head shifter 33) pivots in the vertical direction. The
upper surface cam portion 42c of the sub-rack 42 corresponds to the
"third engagement portion" stated in the claim 5 of the present
application.
[0094] The pair of pins 31e (see FIG. 2) that support the head
shifter 33 pivotally in the vertical direction while being engaged
with the holes 33a of the head shifter 33, the pair of bearing
portions 31b and 31c (see FIG. 2) that support the holder 11
pivotally in the vertical direction while receiving the pivot pins
11b and 11c of the holder 11 and the plurality of guide hooks 31d
(see FIG. 2) that slidably hold and guide the main rack 41 and the
sub-rack 42 on the chassis 31 are the mounting members for mounting
the principal components of the disk drive 1 on the chassis 31. As
is clearly shown in FIG. 2, the chassis 31 is mounted with the
constituent elements of the principal components of the disk drive
1 or the other accessory parts or mounting members for mounting
these components on the chassis 31 besides the above elements.
[0095] The basic operation in inserting the disk cartridge 60 into
the holder 11 will be described next. FIGS. 8 through 10 are
explanatory side views of the disk cartridge 60 and the disk drive
1, for explaining a sequence of operation in executing recording
and reproducing by inserting the disk cartridge 60 into the holder
11. FIGS. 8, 9 and 10 show an insertion start (mounting and
dismounting) position, an insertion completed (closing completed)
position and a recording and reproducing position,
respectively.
[0096] First, if the cartridge 60 is inserted from the mounting and
dismounting position (see FIG. 8) into the holder 11, then the
cartridge 60 is transferred from the mounting and dismounting
position to the insertion completed position (FIG. 9) by the slider
12.
[0097] Then, the sub-rack 42 of the drive mechanism starts to move
in the direction J (see FIG. 5). By this operation, the engagement
projection 11d of the holder 11 comes into engagement from above
with the side cam portion 42a of the sub-rack 42 and moves downward
along this side cam portion 42a. This operation pivots the holder
11 in the direction H shown in FIG. 8 and moves the disk cartridge
60 into the recording and reproducing position (see FIG. 10),
thereby putting the same into a recording and reproducing
state.
[0098] That is, the disk cartridge 60 moves from the state of FIG.
8 via the state of FIG. 9 to the state of FIG. 10, and vice
versa.
[0099] It is to be noted that the slider 12, the lock lever 13, the
engagement projection 11d of the holder 11 and the side cam portion
42a of the sub-rack 42 constitute the loading mechanism disclosed
in the claims of the present application. That is, the principal
portion of the loading mechanism except for the side cam portion
42a is entirely mounted on the holder unit 10.
[0100] The electric motor 34, the output transmission mechanism 40,
the main rack 41, the sub-rack 42 and the switch lever 43
constitute the drive mechanism disclosed in the claims of the
present amplification, and these members are all mounted on the
chassis unit 30.
[0101] The loading operation of the disk cartridge 60 will be
described in more detail below with reference to FIG. 11 through
FIG. 13.
[0102] If the cartridge 60 is manually inserted into the opening
11a of the holder 11 in the direction A in the mounting and
dismounting position (corresponding to the FIG. 8 described above)
of the disk cartridge 60 shown in FIG. 11, then the end surface of
the cartridge 60 abuts against a cartridge receiving pin 13c of the
lock lever 13, thereby making the lock lever 13 pivot in the
direction of arrow D. By this operation, the lock pawl 13b of the
lock lever 13 comes into engagement with a side recess 60a of the
cartridge 60. In this stage, the further pivoting of the lock lever
13 in the direction D is prevented by the engagement of the lock
pawl 13b with the side recess 60a of the cartridge 60.
[0103] It is to be noted that the cartridge receiving pin 13c is
received in a guide groove 11r cut in the holder 11 while being
able to freely slide within the range of this guide groove 11r.
[0104] When the disk cartridge 60 is further inserted in the
direction A, a trigger switch (not shown) for issuing instructions
for operating the drive mechanism operates, thereby transferring
the cartridge 60 further in the direction A via the loading
mechanism. It is to be noted that the trigger switch is
electrically connected to the control board 70.
[0105] FIG. 13 is a plan view (corresponding to FIG. 9 described
above) showing the closing completed (insertion completed) state of
the cartridge 60. In this closing completing operation, a
regulating rib 11f of the holder 11 comes into engagement with a
guide pawl 13d of the lock lever 13, and the guide pawl 13d slides
along the regulating rib 11f, thereby preventing the lock lever 13
from pivoting in the direction C and securely transferring the
cartridge 60 in the direction A.
[0106] When the cartridge 60 is further pushed in the direction A
from the state of FIG. 12 described above, the trigger switch (not
shown) for issuing the instructions for operating the drive
mechanism operates. By this operation, the electric motor 34 starts
to rotate, with which the drive gear 39 starts to rotate in the
direction of arrow O as shown in FIG. 14 successively via the motor
pulley 35, power transmission belt 36, pulley gear 37 and
intermediate gear 38, which serve as a speed reducing system
constituting the output transmission mechanism 40. Then the drive
gear 39 comes into meshing engagement with the toothed portion 41c
provided on the main rack 41, thereby moving the main rack 41 in
the direction of arrow I.
[0107] In this stage, the engagement pin 12b of the slider 12 is
engaged with the recess 41a of the main rack 41. Therefore, the
lock lever 13 placed on the slider 12 moves, by which the cartridge
60 engaged with the lock pawl 13b of the lock lever 13 moves in the
direction A. It is to be noted that the sub-rack 42 is in the
stopped state in this stage, when its toothed portion 42e does not
mesh with the drive gear 39.
[0108] The main rack 41 further advances in the direction I from
this state, and when the main rack advances to the specified
position shown in FIG. 15 (a position corresponding to the
insertion completed position of the disk cartridge 60 in the holder
11), the projection 41b of the main rack 41 comes into engagement
with the recess 43a of the switch lever 43, thereby pivoting the
switch lever 43 in the direction K (see FIG. 15). By this
operation, the pin 43b provided at one end of the switch lever 43
pushes the cam groove 42d of the sub-rack 42 in the direction J, by
which the sub-rack 42 starts to slide in the same direction (i.e.,
the direction opposite to the direction in which the main rack 41
slides).
[0109] Next, when the main rack 41 further advances in the
direction I, the toothed portion 42e of the sub-rack 42 comes into
meshing engagement with the drive gear 39, and thereafter, the
toothed portion 41c of the main rack 41 is disengaged from the
drive gear 39.
[0110] Then, the sub-rack 42 further moves in the direction J with
the pivoting of the drive gear 39 and reaches the specified
position (position corresponding to the recording and reproducing
position of the cartridge 60) shown in FIG. 16.
[0111] By this operation, the engagement projection 11d of the
holder 11 comes into engagement from above with the side cam
portion 42a of the sub-rack 42 and slides along the side cam
portion 42a, by which the cartridge 60 is loaded into the recording
and reproducing position shown in FIG. 10.
[0112] When the sub-rack 42 further advances in the direction J,
the head shifter 33 pivots downward since the arm 33b provided on
one side surface of the head shifter 33 is engaged from above with
an upper surface cam portion 43c of the sub-rack 42 (i.e.,
positioned on the upper surface cam portion 43c), by which the
magnetic head 32a of the recording and reproducing unit 32 is made
to pivot downward to be set into the recording enabled state (see
FIG. 17).
[0113] As described above, according to the present embodiment, the
main rack 41 provided with the recess 41a that serves as the first
engagement portion to be engaged with the slider 12 and the
sub-rack 42 provided with the side cam portion 42a that serves as
the second engagement portion constituting part of the vertical
movement mechanism are slidably arranged opposite to each other on
the chassis 31, and the drive gear 39 is arranged between both
these racks 41 and 42. The switch lever 43 for switching the state
of meshing of the toothed portions 41c and 42e of the racks 41 and
42 with the drive gear 39 is provided while being able to engage
with both the racks 41 and 42. One of the rack members is made to
slide to a specified position by the rotation of the drive gear 39,
and thereafter the switch lever 43 effects a switching operation so
that the toothed portion of the other rack member meshes with the
drive gear 39, by which the other rack member is made to slide to a
specified position in a direction opposite to the direction in
which the one rack member slides. Therefore, the two racks 41 and
42 that have different roles can be driven in the opposite
directions by the one drive gear 39, and the switch lever 43
switches the state of meshing of this drive gear 39 with the
toothed portions 41c and 42e of the racks 41 and 42, thereby
allowing the racks 41 and 42 to be each driven with an appropriate
timing.
[0114] With this arrangement, the structure can be simplified and
compacted in terms of size as compared with the case where the
above two racks 41 and 42 are separately provided. Particularly,
the disk drive can be compacted in size in the transfer direction
of the disk cartridge 60.
[0115] Particularly when the disk cartridge 60 is loaded from the
mounting and dismounting position to the recording and reproducing
position, the main rack 41 is made to slide to a specified position
corresponding to the insertion completed position of the disk
cartridge 60, and thereafter the switch lever 43 effects a
switching operation so that the sub-rack 42 is made to slide to a
specified position corresponding to the recording and reproducing
position of the disk cartridge 60. With this arrangement, the slide
operation of both the racks 41 and 42 are switched in accordance
with an appropriate timing, so that the transfer of the disk
cartridge 60 from the mounting and dismounting position to the
insertion completed position and the descending operation from this
insertion completed position to the recording and reproducing
position can be performed as a sequence of a loading operation.
[0116] Furthermore, the sub-rack 42 is provided with the upper
surface cam portion 42c that serves as the third engagement portion
to engage with the head shifter 33 side of the magnetic head 32a of
the recording and reproducing unit 32. The sub-rack 42 is made to
slide to the specified position corresponding to the recording and
reproducing position of the disk cartridge 60 and thereafter made
to slide further in the same direction, consequently driving the
head shifter 33 to set the magnetic head 32a into the recordable
state. With this arrangement, a further role is assigned to the
sub-rack 42, so that the further compacting of the disk drive 1 can
be achieved.
[0117] It is to be noted that the present invention is not limited
to the above embodiment, and various improvements or modifications
in design can, of course, be achieved within the scope thereof, not
departing from the essence thereof.
[0118] For example, in the above embodiment, with regard to the
portions to be engaged with the transfer member (slider 12) and the
drive mechanism (main rack 41), the slider 12 is provided with the
engagement pin 12b, while the main rack 41 is provided with the
recess 41a. However, the pin and recess may be replaced with each
other. In the above embodiment, with regard to the cam mechanism
constituting the vertical movement mechanism, the slider
(engagement projection 11d) is provided on the holder 11 side,
while the cam surface is provided on the drive mechanism (sub-rack
42) side. However, the slider and the cam surface may be replaced
with each other. Furthermore, with regard to the cam mechanism
provided between the head shifter 33 and the drive mechanism
(sub-rack 42), the same modification can be achieved.
* * * * *