Patent Grant
6938530
This application claims the priority benefit of Japanese application serial no. 11-275233, filed on Sep. 28, 1999, 11-319614, filed on Nov. 10, 1999, and 2000-245438, filed on Aug. 11, 2000.
1. Field of Invention
The present invention relates to a tablet conveying apparatus capable of adjusting the tablet position and a tablet cutting apparatus.
2. Description of Related Art
In past, in hospital and pharmacy tablets are provided to patients according to prescriptions. When one tablet is overdosage or it is hard for a patient to swallow one tablet, this tablet then has to be cut in half or more for example. For such circumstance, cutting a tablet directly by hand is the simplest and fast way. Therefore, a cutting groove is formed on the tablet. In addition, a cutter for cutting tablets is also disclosed by Japanese gazette of JP 6-41546.
Due to that cutting tablets by hand is not very efficient and economic in practice, an automatic tablet cutting machine is disclosed by Japanese gazette of JP 3-114241 and JP 2-29257.
However, the cutting machine uses a belt to retain the tablet and convey to a rotary blade (or a cutter capable of moving up and down), and then a circular tablet as shown in
Namely, the tablet cannot be stably retained by the belt if the tablet is oval or rectangular and the long side of the tablet can not be kept in one direction. Therefore, the relative position between the tablet and the cutter is not well defined when the tablet is conveyed to the cutter. And it is hard to equally cut the tablet in half.
The present invention can adjust the position of the tablet as shown in
Furthermore, a machine capable of adjusting the position of the tablet and conveying the tablet for examining the tablet is also disclosed (such as JP 7-201644). However, the machine uses an industrial conveying belt for transporting the belt and it is only suitable for large equipments of a factory. Therefore, the proposed machine is not suitable for an automatic cutting machine for a pharmacy.
The present invention provides an automatic tablet cutting machine suitable for a pharmacy. Namely, no matter what kind of shape the tablet is, the position of the tablet can be adjusted and arranged, and then conveyed to a cutting location for cutting the tablet.
The present invention provides a tablet conveying apparatus for adjusting position of a tablet, which comprises an arranging device for arranging a long side of the tablet to be perpendicular to the tablet's moving direction by moving the tablet for a first predetermined distance; and an oblique plate for making the tablet fall a second predetermined distance.
The present invention further provides a tablet cutting apparatus for cutting a tablet at a predetermined location. The tablet cutting apparatus comprises a blade for cutting the tablet; an arranging device for arranging a long side of the tablet to be perpendicular to the tablet's moving direction by moving the tablet for a predetermined distance; an oblique plate for making the tablet arranged arranging device by the to fall along the oblique plate; a shutter for stopping the tablet fallen from the oblique plate; a retainer device for retaining the tablet from the long side of the tablet stopped by the shutter; and a conveying device for conveying the tablet adjusted by the retainer device to a cutting location.
The blade mentioned above can be a rotary blade or a cutter capable of moving up and down. The conveying device further comprises a rotary roller and a resilient plate. The rotary roller further comprises a groove formed on the center of the circumstance of the rotary roller corresponding to the blade, and a rugged surface formed symmetrically with respect to the groove on the circumstance of the rotary roller. In addition, the arranging device comprises a pushing plate for pushing the tablet to move forwards.
The arranging device can also comprise a pushing plate for pushing the tablet to move along an arc path. Moreover, the arranging device can comprise a pushing plate for pushing the tablet to move along an arc path; and a baffle plate for radially applying a force on the front end of the tablet while the baffle plate is contact with the front end of the tablet.
The present invention further provides a A tablet cutting apparatus for cutting a tablet at a predetermined location, which comprises a rotary blade for rotationally cutting the tablet; an arranging device for arranging a long side of the tablet to be perpendicular to the tablet's moving direction by moving the tablet for a predetermined distance; a retainer device for retaining the tablet arranged by the arranging device from the long side of the tablet such that the position of the tablet is coincident with a location corresponding to the rotary blade; and a conveying device for conveying the tablet adjusted by the retainer device to the location of the rotary blade.
According to the present invention, the long side of the tablet is perpendicular to its moving direction, and the retainer device retains the ends of the long side of the tablet under such a state. While the tablet is located at a location corresponding to the rotary blade, the tablet is conveyed by a conveying device to the rotary blade for cutting. Therefore, such as an oval tablet or even though a non-circular tablet can be correctly modified its position and then conveyed to the rotary blade.
In addition, comparing with cutting by pressure, because the rotary blade 36 can cut the tablet M safely and credibly, the tablet M can be correctly and shape-irrelevantly cut in half.
The present invention further provides a tablet cutting apparatus for cutting a tablet at a predetermined location. The apparatus comprises a rotary blade for rotationally cutting the tablet; an arranging device for arranging a long side of the tablet to be perpendicular to the tablet's moving direction by moving the tablet along an arc channel; a position modification device for further modifying the position of the tablet fallen from the arranging device such that the long side of the tablet is perpendicular to the tablet's falling direction; a retainer device for retaining the tablet rearranged by the position modification device from the long side of the tablet such that the position of the tablet is coincident with a location corresponding to the rotary blade; and a conveying device for conveying the tablet adjusted by the retainer device to the location of the rotary blade using a rotary roller and resilient plates, wherein a force applied on the tablet during cutting is similar to that applied to the rotary roller and is for setting a relative position of the rotary blade and the conveying device and a rotational direction of the rotary blade.
A position modification device is further installed for modifying the long side of the tablet fallen from the arrange device to be perpendicular to the falling direction. Therefore, even though the long side of the tabled is not arranged to be perpendicular to its moving direction, the position modification device can further actually and correctly rearrange the position of the tablet.
Furthermore, the tablet is retained by the retainer roller and the supporting resilient plate and then moved to the location of the rotary blade. Because the force applied on the tablet during cutting is similar to the force applied to the rotary roller and is for setting the relative position of the rotary blade and the retainer roller, therefore no extra force is applied on the tablet or rotary blade. The tablet can be smoothly and correctly cut.
In addition, the present invention further provides a tablet cutting apparatus for cutting a tablet at a predetermined location. The tablet cutting apparatus comprises a blade for cutting the tablet; a tablet case for providing the tablet; an arranging device for arranging a long side of the tablet to be perpendicular to the tablet's moving direction by moving the tablet for a predetermined distance; an oblique plate for making the tablet arranged by the arranging device to fall along the oblique plate; a shutter for stopping the tablet fallen from the oblique plate and further rearranging the position of the tablet; a retainer device for retaining the tablet from the long side of the tablet stopped by the shutter such that the position of the tablet is coincident with a location corresponding to the rotary blade; a conveying device for conveying the tablet adjusted by the retainer device to a cutting location; and a position changing device installed along a falling path of the tablet out of the tablet case.
Moreover, the present invention provides a tablet cutting device, which comprises a blade for cutting the tablet; an arranging device for arranging a long side of the tablet to be perpendicular to the tablet's moving direction by moving the tablet for a predetermined distance; an oblique plate for making the tablet arranged by the arranging device to fall along the oblique plate; a shutter for stopping the tablet fallen from the oblique plate and further rearranging the position of the tablet; a retainer device for retaining the tablet from the long side of the tablet stopped by the shutter such that the position of the tablet is coincident with a location corresponding to the rotary blade; and a conveying device for conveying the tablet adjusted by the retainer device to a cutting location, wherein the retainer device is expanded within a range for guiding the tablet before the conveying device is driven.
It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the invention as claimed.
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings,
Accompanying with the drawings, follows are detailed descriptions of a tablet conveying and cutting apparatus of the present invention.
In
Basically, the main body of the tablet conveying and cutting apparatus 1 of the present invention is constructed of three plates 2, 3 and 4, a bottom plate 6 and a top plate 7, which is substantially a box shaped structure. The tablet feeder 8 is installed on the top plate.
Arc-shaped channel walls 12, 13 are form on a horizontal plate 11 underneath the top plate 7. The channel walls 12, 13 are centered at the same point and placed with a predetermined spacing, and therefore a channel 14 is formed therebetween. One end of the channel 14 is located under the baffle plate 9 installed on the bottom of a shoot portion of the tablet feeder 8, while the other end is extended to the plates 2, 3. In addition, the baffle plate 9 is an optional element, which has no influence on the overall operation if it is not installed.
A rotary arm 16 is driven by a rotary arm motor 17 installed underneath the horizontal plate 11, which rotation center is the same as the center of the arcs of the channel walls 12, 13 mentioned above. In addition, a pushing plate 16A is mounted on the end of the rotary arm 16 and is freely moved along the channel 14. The area of the pushing plate 16A is substantially the same as the cross-sectional area of the channel 14. The pushing armed can be rotated due to the rotation of the rotary arm motor 17, and therefore the rotary arm is moved from one end to the other end of the channel 14 with a constant speed.
An oblique plate (position modification device) 18 is installed between the plates 2, 3, in which one end of the oblique plate is connected to the end of the channel 14 and the oblique plate is oblique downwards. A second baffle plate 19 is further assembled within the channel 14 between the oblique plate 18 and the baffle plate 9. The second baffle plate 19 is rotationally mounted on the channel wall 12 and extended towards the center of the arc formed by the channel wall 12. The second baffle plate 19, for example, is made of flexible and resilient material. The channel walls 12, 13, channel 14, rotary arm 16 and the second baffle plate 19 form a so-called arranging device. Moreover, the second baffle plate 19 can, for example, be made of iron, which is mounted on the channel wall 12 and capable of freely rotating. The second baffle plate 19 is mounted on the channel wall 12 using a resilient element, such as a spring, and is protruded towards the arc center of the channel wall 12.
A supporting resilient plate 21 is installed between the plates 2, 3. The supporting resilient plate 21 is connected to the lower end of the oblique plate 18 with the same grade and is further bent and extended in horizontal. In addition, a shutter 22 is installed on the supporting resilient plate 21. A retainer roller (rotary roller) 23 is formed located under and behind the shutter 22. The retainer roller 23 is supported and freely rotated between the plates 2, 3 and further located above the supporting resilient plate 21.
The shutter 22 mentioned above is connected to a shutter motor 24 installed on opposite side of the plate 2 through cranks 26, 27. Accordingly, a crank structure consisted of the cranks 26, 27 is capable of moving up and down while the shutter motor rotates.
In addition, the retainer roller 23 is connected to a roller motor 31 installed on opposite side of the plate 2 through a small pulley 32, a large pulley 33 and a belt 34. Due to the rotation of the roller motor 31, the retainer roller 23 is rotated clockwise with respect to
A rotary blade 36 is installed under the retainer roller 23 and the supporting resilient plate 21. The rotary blade is mounted on a rotational shaft of a rotary blade motor 37 installed on the opposite side of the plate 2 by a fixer 38 and located under the midst between the plates 2, 3. The rotary blade 36 is rotated counterclockwise with respect to
Grooves 23A, 21A are respectively formed at the center of the circumstances of the retainer roller 23 and supporting resilient plate 21 and formed up and down at corresponding locations. The upper portion of the rotary blade 36 is capable of passing through the grooves 21A, 23A and reaches within the retainer roller 23, by which the rotary blade 36 has no interference with the retainer roller 23 and the supporting resilient plate 21. Furthermore, a reception dish 54 is assembled underneath the rotary blade 36.
A pair of retainer plates 41, 42 (retainer device) are formed at left and right with respect to the oblique plate 18 and the supporting resilient plate 21. The retainer plates 41, 42 are respectively fixed on sliding plates 43, 44 and the sliding plates 43, 44 are assembled between a base plate 46, and holding-down plates 47,48. Accordingly, the sliding plates 43, 44 are capable of moving left and right. As shown, the retainer plates 41, 42 are therefore formed on a bottom surface of the base plate 46 and the sliding plates 43, 44 are formed on the top surface of the base plate 46. The retainer plates 41, 42 are connected to the sliding plates 43, 44 through openings 46A, 46B on the base plate 46.
Pins 43A, 44A are further respectively mounted on the left ends of the sliding plates 43, 44. Each of the pins 43A, 44A are rotationally and movably received within grooves 52A, 52B on the two ends of a rod 52 connected to a shaft of a retainer plate motor 51 installed on the bottom surface of the base plate 46. The retainer plates 41, 42, the sliding plates 43, 44, the base plate 46, the holding-down plates 47, 48, the retainer plate motor 51 and the rod 52 form a retainer structure.
As described above, as the retainer plate motor 51 rotates, the rod 52 is then rotated clockwise with respect to
The rotary arm motor 17, the shutter motor 24, the retainer roller motor 31 and the retainer plate motor 51 are step motors, and the rotary blade motor 37 is a DC (direct current) motor, for example, and are all controlled by a control device (not shown).
The operations based on the foregoing structure are described and discussed in detail. When an elliptical (oval) or long-circular tablet is drained piece by piece from the shoot of the tablet feeder 8, the drained (or processed) tablet M is blocked by the baffle plate 9. The direction or position of the tablet M is changed and then the tablet M falls on the channel 14. The control device then drives the rotary arm motor 17 such that the rotary arm 16 is rotated counterclockwise with respect to
Accordingly, the pushing plate 16A on the rotary arm 16 pushes the tablet M to move to hit the baffle plate 19. Due to the pushing force, the position of the tablet is changed along the surface of the pushing plate 16A such that the long side of the tablet is perpendicular to the tablet's moving direction.
The tablet M pushed by the pushing plate 16A is then contact with the baffle plate 19 which tip portion is expanded and deformed due to the resilience of the baffle plate 19 itself. The reaction of the baffle plate 19 is then experienced on the tablet M as an oblique force. A rotational momentum is therefore created by the vector sum of the reaction force of the baffle plate 19 and the pushing force of the pushing plate 16A, causing that the long side of the tablet is perpendicular to the tablet's moving direction.
The tablet M almost reaches the oblique plate 18 after passing the baffle plate 19, and then falls along the oblique plate 18, during which the long side of the tablet is credibly perpendicular to the tablet's moving direction.
Moreover, the retainer plates 41, 42 are separated from each other, the tablet is thus sliding downwards between the retainer plates 41, 42. Afterwards, the rotary arm 16 is rotated clockwise with respect to
When the tablet M is blocked and stopped by the shutter 22, it is not necessary that the center of the tablet M must be coincident with the center line of the plates 2, 3. The control device first drives the shutter motor 24 for raising the shutter 22 by the cranks 26, 27, and then the retainer motor 51 is driven to move the retainer plates 41, 42 to move towards each other. The two ends of the long side of the tablet M are then respectively retained by the retainer plates 41, 42 when the center of the tablet M is coincident with the center line of the plates 2, 3.
Under such a circumstance, the long side of the tablet M is perpendicular to its moving direction and the center of the tablet M is located on the center line of the plates 2, 3, i.e., the center of the tablet M is located on an extension line of the rotary blade 36.
The control device then drives the roller motor 31 such that the retainer roller 23 is rotated slowly, and at the same time, which the rotary blade 36 still runs, the retainer motor 51 is driven to separate the retainer plates 41, 42.
After the tablet M reaches the retainer roller 23, the tablet M is resiliently retained up and down by the retainer roller 23 and the supporting resilient plate 21 and then moves slowly to the left with respect to
The thickness of the tablet M is absorbed because of the deformation of lower part of the supporting resilient plate 21. Moreover, the rotary blade 36 rotates within the grooves 21A, 23A and the tablet M is cut by the rotary blade 36 under the condition of being retained at the retainer roller 23, the force is thus acted on the retainer roller 23 rather than the supporting resilient plate 21.
According to the present invention, the rotary arm 16 makes the tablet M move within the channel 14 such that the long side of the tablet M is perpendicular to its moving direction. The ends of the long side of the tablet M are retained by the retainer plates 41, 42. After the center of the tablet M is changed to be corresponding to the rotary blade 36, the retainer roller 12 conveys the tablet M to the rotary blade 36 for cutting the tablet M. Therefore, the position of the tablet M with the oval or rectangular shape, even other than circular shape, can be more definitely consistent with the location of the rotary blade 36 during conveying to the blade 36.
In addition, comparing with cutting by pressure, because the rotary blade 36 can cut safely and credibly the tablet M, the tablet M can be correctly cut in half.
In particular, because when the long side of the tablet M is modified to be perpendicular to its falling direction during falling down the oblique plate 18, therefore even though the long side of the tablet M is not perpendicular to its moving direction, it can be still actually modified while the tablet M falls down to the oblique plate 18.
The tablet M is retained by the retainer roller 23 and the supporting resilient plate 21 and then moved to the location of the rotary blade 36. Furthermore, because the force applied on the tablet M during cutting is similar to the force applied to the retainer roller 23 for setting the relative position of the rotary blade 36 and the retainer roller 23, therefore no extra force is applied on the tablet M or rotary blade 36.
As discussion of the foregoing embodiment, the retainer plates 41, 42 are driven to be moved toward each other or apart by the crank structure consisting of the sliding plates 43, 44, the pins 43A, 44A and the rod 52. However, it is not the only structure applied to the present invention. For example, as shown in
As described above, due to the clockwise and counterclockwise rotations of the retainer motor 51, the conveying belt 61 can convey along the forward or backward path such that the sliding plates 43, 44 can operate as the crank structure. Furthermore, the conveying belt can be replaced by gears and then the same operations can be achieved. In the embodiment, the base plate 46 is assembled vertically, which can further reduce the distance of the oblique plate 18 by comparing with the previous embodiment. Therefore, as the distance of the oblique plate 18 is reduced, the falling distance down to the oblique plate 18 of the tablet m can be also reduced.
Furthermore, in these embodiments, oval tablet is used to explain the operation, but in general the circular tablet can be cut equally in half from it center in the way and no further description is made for this.
Referring to
As shown in
As shown, numeral 16′ denotes the rotary arm, numeral 16A′ is the pushing plate, numeral 16B′ represents a restrict level of the baffle plate and numeral 23′ is the retainer roller.
As shown in
Next, the operation of the tablet conveying and cutting apparatus of the present invention is described in detail in accompany with
As the cutting operation begins, the rotary arm 16A′ and the retainer plates 41, 42 are set to respective initial positions. Next, a first tablet is drained from the tablet feeder. The rotary motor 17 is driven such that the pushing plate 16A′ pushes the tablet M. Afterwards, as shown in
As shown in
Next referring to
Next, the shutter 22 is described in detail as followings.
The tablet M falls downwards the oblique plate 18 and the supporting resilient plate 21, and the tablet M may be inclined at this time. Therefore, the tablet M may be jammed with the retainer roller 23′ when the inclined tablet is contact with the retainer roller 23′. Therefore, the shutter 22 is installed here for preventing jam from occurrence. The long side of the tablet M is thus aligned with the surface of the shutter 22 for collimating the position of the tablet M. Then, the shutter 22 is opened and the tablet M falls to contact with the retainer roller 23′. The tablet M is not jammed with the roller 23′ because the falling distance of the tablet M is shortest.
The retainer plates 41, 42 then move towards the center (direction E shown in
The tablet M is conveying by the retainer roller 23′ and cut by the rotary blade 36. During the cutting operation, the force from the rotary blade 36 is applied to the roller 23′ rather than the supporting resilient plate 21. Therefore, even if the rotary blade 36 rotates, the retaining force on the tablet M from the roller 23′ and the supporting resilient plate 21 is not decreased and the tablet M can be hold stably.
In the foregoing embodiment, the rotary blade 36 is used for cutting the tablet M. However, a guillotine cutter, which operates up and down, can be used for cutting the tablet M. Moreover, during cutting the tablet M, powder may be occurred and spread everywhere. Therefore, a cleaning device for easily cleaning the tablet conveying and cutting apparatus can be installed.
FIGS. 18 to 24A–24C further show another embodiment of the present invention, in which the same numerals represent the same elements shown in FIGS. 1 through 17A–17D and their corresponding descriptions are omitted. From
As shown in
The operation of this embodiment is described in detail as followings. As the cutting operation begins, the rotary arm 16′ and the retainer plates 41′, 42′ are set to respective predetermined locations. Tablets are then drained from the tablet feeder one by one. As shown in
The rotary arm motor 17′ is driven so that the pushing plate 16A′ can push the tablet M to move forwards. Then, as shown in
Referring to
The fallen tablet M is in contact with the shutter 22 and therefore blocked and stopped by the shutter 22. Then, the shutter 22 is opened and the tablet M falls to a contact position with the retainer roller 23′. Because the falling distance of the tablet M in this case is shortest, the tablet M is not jammed with the retainer roller 23′. The retainer plates 41, 42 then move towards the center such that the center of the tablet M is consistent with the location of the rotary blade 36.
As described in the third embodiment above, the retainer roller 23′ is driven. When the tablet M is retained by the retainer plate 41′ 42′, if the retaining force from the retainer plate 41′ 42′ is small, the tablet M can be conveyed by the retainer roller 23′ without any problem. However, if the retaining force from the retainer plate 41′ 42′ is large, the tablet M cannot be conveyed by the retainer roller 23′. Namely, the tablet M can be conveyed by the retainer roller 23′ when the retaining force is weak and small. In contrast, if a motor with large torque is used to drive the retainer plates 41′, 42′, the retaining force becomes larger and therefore the retainer roller 23′ fails to convey the tablet M.
The retainer plates 41′, 42′ return to the initial positions before the roller 23′ is driven. However, as proceeded in this manner, the tablet M may be inclined at the beginning that the tablet M is retained by the roller 23′ and the supporting resilient plate 21. Therefore, the retainer plates 41′, 42′ are controlled to separate slightly before the roller 23′ is driven.
After the retainer plates 41, 42 are separated, the retainer roller 23′ is driven. The guide distribution of the retainer plates 41, 42 is finished at the beginning that the tablet M is retained by the roller 23′ and the supporting resilient plate 21. Therefore, the tablet M can be prevented from inclination.
Accordingly, the tablet M is not inclined and the retainer roller 23′ can be used for conveying the tablet M. Afterwards, the tablet M is conveyed to the rotary blade 36 for cutting. The tablet M is equally cut in half and then fallen to the reception dish 54′.
Finally, how the tablet is fallen from the tablet case 100 is addressed.
As shown in
According to the present invention, the position of the tablet M can be arranged or changed using a simple structure. Furthermore, even though the tablet is other than circular, the tablet can be correctly cut.
According to the present invention, the long side of the tablet is perpendicular to its moving direction, and the retainer device retains the ends of the long side of the tablet under such a state. While the tablet is located at a location corresponding to the rotary blade, the tablet is conveyed by a conveying device to the rotary blade for cutting. Therefore, such as an oval tablet or even though a non-circular tablet can be correctly modified its position and then conveyed to the rotary blade.
In addition, comparing with cutting by pressure, because the rotary blade 36 can cut the tablet M safely and credibly, the tablet M can be correctly and shape-irrelevantly cut in half.
In particular, according to claim 11, a position modification device is installed for modifying the long side of the tablet fallen from the arrange device to be perpendicular to the falling direction. Therefore, even though the long side of the tabled is not arranged to be perpendicular to its moving direction, the position modification device can further actually and correctly rearrange the position of the tablet.
Furthermore, the tablet is retained by the retainer roller and the supporting resilient plate and then moved to the location of the rotary blade. Because the force applied on the tablet during cutting is similar to the force applied to the rotary roller and is for setting the relative position of the rotary blade and the retainer roller, therefore no extra force is applied on the tablet or rotary blade. The tablet can be smoothly and correctly cut.
Furthermore, the position of the tablet can be arranged and changed using a simple mechanism. In addition, the tablet can be correctly cut even though the tablet is other than circular.
It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 11-275233 | Sep 1999 | JP | national |
| 11-319614 | Nov 1999 | JP | national |
| 2000-245438 | Aug 2000 | JP | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 2906070 | Shecter | Sep 1959 | A |
| 3363741 | Dierksheide | Jan 1968 | A |
| 3727495 | Vermes et al. | Apr 1973 | A |
| 4131041 | Ludemann et al. | Dec 1978 | A |
| 4199863 | Deckert | Apr 1980 | A |
| 4205743 | Whitmore | Jun 1980 | A |
| 6308109 | Yuyama et al. | Oct 2001 | B1 |
| 6488192 | Yuyama et al. | Dec 2002 | B1 |
| 6722545 | Yuyama et al. | Apr 2004 | B2 |
| Number | Date | Country |
|---|---|---|
| 02-029257 | Jan 1990 | JP |
| 03-114241 | May 1991 | JP |
| 06-041546 | Feb 1994 | JP |
| 07-201644 | Aug 1995 | JP |
