JP5799392B2 - Drug supply device - Google Patents

Description

  The present invention relates to a medicine supply device that can supply medicines in small portions.

  A medicine packaging machine or the like is provided with a medicine supply device that can supply medicines such as tablets. For example, what was provided in the "pharmaceutical packaging apparatus" of patent document 1 is mentioned.

  The drug supply device is described as “tablet supply unit” in Patent Document 1. The tablet supply unit is provided on the upper surface side of the medicine packaging apparatus, and has a tablet storage part in which a plurality of tablet storage baskets are provided in a matrix shape, and an operator such as a pharmacist holds a tablet in the tablet storage part. It is supplied by hand. At this time, one tablet is supplied for each tablet container.

  A tablet dispensing unit is provided below the tablet container (on the inner side of the apparatus), and the tablets supplied to the tablet container are automatically taken out (dispensed) as described above. Can be supplied to.

  The drug packaging device described in Patent Document 1 is a device in which a tablet supply unit as a drug supply device is fixed to a main body portion of the device. As described above, since the tablet supply unit is provided on the upper surface side of the medicine packaging apparatus, when the worker is a small person, the hand is considerably extended to supply the tablet to the tablet container near the back surface. In some cases, it was difficult to work. This is particularly noticeable when a large number of tablet storage baskets are arranged in the depth direction in a large drug packaging device.

  Therefore, the inventor of the present application has come up with a structure in which a part of the medicine supply device can be pulled out to the front side (side where the worker stands). More specifically, this structure draws out a top tablet cassette unit (hereinafter referred to as “cassette unit”), which is a portion corresponding to “tablet accommodating portion” of Patent Document 1, from the main body portion of the medicine packaging apparatus. This is a possible structure. By doing so, the distance between the worker and the cassette unit is reduced, and the work can be facilitated even if the worker is a small person.

JP 2010-18335 A

  However, when the cassette unit can be pulled out in this way, when the cassette unit is pulled out, a space is created in the part where the cassette unit originally existed. For this reason, an operator may accidentally put a medicine into this space, or foreign substances such as different kinds of medicine may enter the inside of the medicine packaging device, causing troubles such as dispensing errors.

  Therefore, an object of the present invention is to provide a medicine supply device that can prevent foreign matters from being mixed inside the device when the cassette unit is pulled out.

  The present invention provides a medicine supply apparatus M that can supply medicines in small portions, and is provided so as to be movable between a fixed position where the medicine can be supplied and a withdrawal position shifted from the fixed position, and the medicine is divided into small parts. And a cassette unit 1 having a removable cassette body 10, and when the cassette unit 1 is in a fixed position, the cassette unit 1 is closed from above. A cover 2 movably provided between the position and the open position where the cassette unit 1 is exposed, and an association mechanism 3 for associating the operations of the cassette unit 1 and the cover 2. When the cassette unit 1 is in the drawer position, the operation of the cover 2 is restricted so as to keep the cover 2 in the closed position. Ri, the cassette body 10 is characterized in that the cassette unit 1 can be removed from the cassette unit 1 when in the extended position.

  According to the above configuration, since the association mechanism 3 regulates the operation of the cover 2 so as to keep the cover 2 in the closed position, the space formed in the portion where the cassette unit 1 is pulled out when the cassette unit 1 is in the pulling position is covered. 2 can cover. And the cassette main body 10 can be removed and dust etc. can be cleaned easily. Further, since the cassette body 10 can be removed and the medicine can be hand-made to the medicine dispensing basket 11 of the removed cassette body 10, the medicine supply operation can be easily performed without being limited in place. .

  Further, the present invention provides a medicine supply apparatus M capable of supplying medicines in small portions, provided so as to be movable between a fixed position where the medicine can be supplied and a pulling position deviated from the fixed position. When the cassette unit 1 has a removable cassette main body 10 and the cassette unit 1 is in a fixed position, the cassette unit 1 is removed from above. A cover 2 movably provided between a closed position where the cassette unit is exposed and an open position where the cassette unit is exposed; an association mechanism 3 for associating the operations of the cassette unit 1 and the cover 2; A cassette unit removal restricting means 4 for restricting removal from the unit 1, and the association mechanism 3 includes: When the cover 2 is in the open position, the operation of the cassette unit 1 is restricted so as to keep the cassette unit 1 in a fixed position. The cassette unit removal restricting means 4 is configured so that the cassette unit 1 is in a fixed position. In this case, the removal of the cassette body 10 from the cassette unit 1 is restricted.

  According to the above configuration, since the associating mechanism 3 regulates the operation of the cassette unit 1 so as to keep the cassette unit 1 in a fixed position, the cassette unit 1 is pulled out when the cover 2 is in the open position, thereby creating a space. Can be prevented. And when the cassette unit 1 exists in a fixed position, the cassette main body 10 cannot be removed upwards. For this reason, it is possible to prevent the cassette body 10 from being unintentionally removed, the under tablet cassette being exposed, and foreign substances and the like from entering the medicine supply device M.

  The cassette unit removal restricting means 4 can also restrict the cassette body from moving upward from the position of the cassette body at the fixed position.

  According to the present invention, since the cover can cover the space that can be formed in the portion from which the cassette unit is pulled out, it is possible to prevent foreign matters from being mixed into the apparatus when the cassette unit is pulled out.

It is the perspective view seen from the front side which abbreviate | omitted the internal mechanism of the chemical | medical agent packaging apparatus provided with the chemical | medical agent supply apparatus of this embodiment. It is a perspective view which shows the upper part of the chemical | medical agent packaging apparatus, and shows the state which has a cassette unit in a fixed position and a cover exists in a closed position. It is a perspective view which shows the upper part of the chemical | medical agent packaging apparatus, and shows the state which has a cassette unit in a drawer position and a cover in a closed position. It is a perspective view which shows the upper part of the chemical | medical agent packaging apparatus, and shows the state which has a cassette unit in a fixed position and a cover exists in an open position. It is a principal part expansion perspective view of the chemical | medical agent supply apparatus of this embodiment, and shows the state in which a cassette unit exists in a drawer position and a cover exists in a closed position. It is a principal part expansion perspective view of the chemical | medical agent supply apparatus of this embodiment, and shows the state which has a cassette unit in a fixed position and a cover exists in a closed position. It is a principal part expansion perspective view of the chemical | medical agent supply apparatus of this embodiment, and shows the state in the middle of the cassette unit being in a fixed position and the cover being opened. It is a principal part expansion perspective view of the chemical | medical agent supply apparatus of this embodiment, and shows the state which the cassette unit control means has not act | operated. It is a principal part expansion perspective view of the chemical | medical agent supply apparatus of this embodiment, and shows the state which the cassette unit control means is act | operating.

  Next, the present invention will be described by taking up one embodiment.

  The drug supply device M of the present embodiment can supply a drug in small portions. For example, as shown in FIG. 1, the medicine supply device M is used by being incorporated in a medicine packaging device. Drugs to be subdivided are drugs (except for those encapsulated in capsules) excluding those in gaseous, liquid, powder, and granular form. It has a form in which the amount (for example, the amount of one package) can be separated by hand. For example, a tablet and a capsule are mentioned.

  The medicine supply device M includes a cassette unit 1, a cover 2, and an association mechanism 3. The cassette unit 1 is movable between a fixed position (see FIGS. 2 and 4) that is a position where the medicine can be supplied to the next process and a pull-out position (see FIG. 3) that is shifted from the fixed position. Is provided. As shown in FIG. 3, a plurality of medicine dispensing tubs 11 are provided in the upper part of the cassette unit 1 in parallel in the illustrated depth direction and left-right direction. The medicine dispensing basket 11 is open at the top and bottom. An opening / closing shutter 12 is provided at the lower part of the cassette unit 1 (see FIG. 9), and the lower end of the medicine dispensing basket 11 can be opened and closed. Thereby, when the open / close shutter 12 is closed, the medicine can be temporarily kept in the medicine dispensing basket 11 in a state where the medicine is divided. When the opening / closing shutter 12 is open, the medicine can be dropped downward from the medicine dispensing basket 11 and the medicine can be supplied to an under tablet cassette (not shown) provided below the cassette unit 1. . By the way, like the conventional medicine supply device, a shutter is also provided at the bottom of this under tablet cassette, and by opening this shutter, it is divided into one package in the packaging device provided further below the under tablet cassette. The medicine can be supplied one by one (not shown). Since the cassette unit 1 is pulled out by an operator, the front side of the cassette unit 1 is cut out and a puller 13 is provided in order to make it easier for the operator to put the hand.

  The cover 2 is provided so as to be movable between a closed position (see FIGS. 2 and 3) covering the cassette unit 1 from above and an open position (see FIG. 4) where the cassette unit 1 is exposed. The cover 2 according to the present embodiment is a single plate, and is provided with a hinge on the back side (the back side in the figure) so that it can be rotated between a closed position and an open position. Yes. A handle 21 is provided at the front side end of the cover 2 so as to protrude to the front side, and an operator can rotate the cover 2 with the handle. And as shown in FIG. 4, the claw part 22 of two places protrudes in the inner surface near the front of the cover 2, and the front-end | tip of each nail | claw part 22 is bent so that it may oppose. This bent portion becomes a hooking portion 311a of the association mechanism 3 described later. When the cover 2 is in the open position, an operator such as a pharmacist can manually supply the medicine to the medicine dispensing basket 11 of the cassette unit 1.

  The cover 2 is not limited to that of the present embodiment. For example, a cover that slides horizontally, a cover that moves upward, and a hinge that can be folded back are provided. The present invention can be implemented in various forms. Further, by providing reinforcing portions such as ribs 23 shown in FIG. 4 on the front surface or the back surface, even if an object is placed on the cover 2, it may be made difficult to bend. Further, as shown in FIG. 4 and the like, the cover 2 of the present embodiment is composed of a single plate-shaped body, but is composed of a plurality of overlapping plate-shaped bodies, specifically an outer cover piece, Two inner cover pieces or a plurality of three or more cover pieces may be assembled. In this case, the prescription may be sandwiched between a plurality of cover pieces, and the prescription may be held in an easy-to-view position for the operator with the cover pieces standing.

  In addition, an operator often works while standing on the front side of the medicine packaging device. As described above, since the cassette unit 1 is provided so as to be movable between the home position and the drawer position, when the cassette unit 1 is moved to the drawer position, the distance between the operator and the cassette unit is reduced. Therefore, even if the worker is a small person, he / she can take his / her hand over all the medicine subdivision baskets 11 without difficulty, and the handwork of medicine can be facilitated. When the cassette unit 1 is in the drawer position as described above, the cassette body 10 which is a part of the cassette unit 1 can be removed, and cleaning and the like are facilitated. The cassette body 10 can be easily removed by having a handle 14 provided on the left and right sides of the cassette body 10 as shown in FIG.

  The associating mechanism 3 associates the operations of the cassette unit 1 and the cover 2. The association mechanism 3 includes a cover restricting means 31 and a cassette unit restricting means 32. The cover regulating means 31 regulates the operation of the cover 2 so as to keep the cover 2 in the closed position when the cassette unit 1 is in the drawer position. The cassette unit regulating means 32 regulates the operation of the cassette unit 1 so as to keep the cassette unit 1 at a fixed position when the cover 2 is in the open position. As a result, when the cassette unit 1 is in the drawer position, the cover 2 is in the open position, so that a space is created in the part where the cassette unit originally existed, and the under tablet cassette is exposed, and the inside of the medicine supply device M It is possible to prevent foreign matters and the like from being mixed into the surface.

  When the cover 2 is configured by a plurality of overlapping plates as described above, the association mechanism 3 restricts the operation only to the inner cover piece, and the outer cover piece and the like other than the inner cover piece are cassettes. The unit 1 may be freely opened and closed regardless of the position of the unit 1.

  The cover restricting means 31 includes a first cover restricting member 311 and a second cover restricting member 312. In the present embodiment, the first cover restricting member 311 is provided on the cover 2 and the second cover restricting member 312 is provided on the cassette unit 1. Conversely, the first cover restricting member 311 is provided on the cassette unit. 1 and the second cover regulating member 312 may be provided on the cover 2.

  The first cover regulating member 311 has a hooking portion 311a. As described above, the hook portion 311a is formed at the tip of the claw portion 22 provided on the inner surface of the cover 2.

  The second cover restricting member 312 has a hooked portion 312a provided in parallel with the drawer direction of the cassette unit 1 as a reference, and an open portion 312b that is a portion where the hooked portion 312a is not provided.

  The hooked portion 312a regulates the movement of the cover 2 to the open position by being hooked on the hooking portion 311a. Specifically, it is a portion protruding in the shape of a bowl at the left and right ends of the cassette unit 1 shown in the figure (see FIGS. 5 to 7). As a result, the hooked portion 312a is configured such that the hook 2 311a and the hooked portion 312a are hooked when the cassette unit 1 is at least in the pulling position, in other words, when the cassette unit 1 is not in the fixed position. Restrict movement to the open position.

  The opening 312b is formed with a space 312s that does not hinder relative movement with respect to the hook 311a when the cover 2 moves to the open position. Specifically, the hooked portion 312a is interrupted at the front side portion of the right and left end portions of the cassette unit 1 in the figure. In the open part 312b, the space 312s is a space extending in the vertical direction. Along with the movement of the cover 2 that moves from the closed position to the open position, the hook portion 311a that moves upward passes through the space 312s. Therefore, when the cover 2 is in the closed position and the cassette unit 1 is in the fixed position, the hooking portion 311a is in a positional relationship that coincides with the opening portion 312b as shown in FIG. Thus, the hooked portion 312a allows the cover 2 to move to the open position when the hooking portion 311a passes through the space 312s of the opening portion 312b when the cassette unit 1 is in a fixed position.

  As shown in FIGS. 8 and 9, the cassette unit restricting means 32 includes a first cassette unit restricting member 321 provided in a portion other than the cassette unit 1 of the medicine supply device M and a second cassette provided in the cassette unit 1. A unit restricting member 322.

The first cassette unit regulating member 321 is interlocked with the opening / closing operation of the cover 2.
The first cassette unit regulating member 321 of this embodiment has a shaft portion 321a, a claw portion 321b, and a pressed portion 321c. The shaft portion 321a is formed in the vertical direction, and the upper end is a pressed portion 321c. The claw portion 321b is an upward claw-like portion protruding from the lower side of the shaft portion 321a to the front side. An engaging portion 321b1 is formed on the back side of the claw portion 321b.

  As shown in FIG. 9, the second cassette unit restricting member 322 engages with the first cassette unit restricting member 321 so as to restrict the drawer of the cassette unit 1 when the cover 2 is in the open position. The second cassette unit restriction member 322 of the present embodiment is a plate-like body provided in parallel with the back surface of the cassette unit 1 and is hooked on the claw portion 321b of the first cassette unit restriction member 321.

  The shaft portion 321a of the first cassette unit regulating member 321 is always urged by a spring (not shown), and the pressed portion 321c protrudes upward as shown in FIG. When the pressed portion 321c is pressed as shown in FIG. 8 by the pressing portion 24 that is a convex portion provided on the back side of the cover 2, the shaft portion 321a moves downward. Thus, in the state where the shaft portion 321a is moved downward, the claw portion 321b is not caught by the second cassette unit restricting member 322, so that the cassette unit 1 can be moved in the drawing direction. Thereby, as shown in FIG. 8, when the cover 2 is in the closed position, the cassette unit 1 can be pulled out.

  On the other hand, as shown in FIG. 9, when the cover 2 is in the open position, the shaft portion 321a of the first cassette unit restricting member 321 returns to the upper position by the bias of the spring, so that the engaging portion of the claw portion 321b 321b1 contacts the second cassette unit restriction member 322. Since the engaging portion 321b1 of the claw portion 321b is located on the front side of the second cassette unit restricting member 322, the cassette unit 1 cannot be moved in the pull-out direction. In this way, the operation of the cassette unit 1 is restricted by the cassette unit restriction means 32 so as to keep the cassette unit 1 at a fixed position.

  As described above, the association mechanism 3 of the present embodiment physically restricts the operation of the cassette unit 1 or the cover 2 by engaging one member with the other member, but is not limited thereto. It is not a thing. For example, the cassette unit 1 or the cover 2 may be driven by a motor, and the operation of the cassette unit 1 or the cover 2 may be regulated by controlling energization to the motor. The energization control can be performed, for example, by sensing the position of the cassette unit 1 or the cover 2 with a sensor.

  Even if the operation of the cassette unit 1 or the cover 2 is physically restricted, the cover restricting means 31 and the cassette unit restricting means 32 are not separately provided as in the present embodiment. You may comprise so that both may be interlock | cooperated by etc.

  Further, in the present embodiment, the cassette unit removal restricting means 4 is provided that restricts the movement in the removal direction, which is a direction different from the movement between the fixed position and the drawer position of the cassette unit 1, by engagement. In the present embodiment, the cassette main body 10 which is a part of the cassette unit 1 is restricted from moving upward from the fixed position. This cassette unit removal restricting means 4 is as shown in FIG. 4, and the upper side of the cassette unit 1 (particularly the cassette body 10) is opposed to each of the right and left sides of the cassette unit 1 in the medicine supply device M. It is formed so as to cover it.

  When the cassette unit 1 is in a fixed position, the cassette unit removal restricting means 4 exists above the cassette unit 1 (particularly, the cassette body 10). Therefore, in this embodiment, the cassette body 10 of the cassette unit 1 is removed upward. It is possible to prevent the cassette body 10 from being unintentionally removed and the under-tablet cassette from being exposed, so that foreign matter or the like can be prevented from entering the medicine supply device M. When the cassette unit 1 is in the drawer position, the cassette unit removal restricting means 4 does not restrict the upward movement of the cassette unit 1 (particularly the cassette body 10). It can be done easily.

  Further, since the cassette body 10 can be removed and the medicine can be hand-made to the medicine dispensing basket 11 of the removed cassette body 10, the medicine supply operation can be easily performed without being limited in place. . When a plurality of cassette main bodies 10 are prepared, the medicine supply (handing) operation is completed by replacing the cassette main body 10 with the empty cassette main body 10 after dispensing the tablets. The medicine supply in the apparatus M can be performed efficiently, and the subsequent packaging work can also be performed efficiently.

  It should be noted that the present invention provides the medicine supply device M that can supply medicine in small portions, and is provided so as to be movable between a fixed position where the medicine can be supplied and a withdrawal position shifted from the fixed position. A cassette unit 1 that can be temporarily held in a state, a closed position that covers the cassette unit 1 from above when the cassette unit 1 is in a fixed position, and an open position where the cassette unit 1 is exposed. A cover 2 movably provided between the cassette unit 1 and an association mechanism 3 for associating the operations of the cassette unit 1 and the cover 2, and the association mechanism 3 is configured to cover the cover when the cassette unit 1 is in the drawer position. It is also possible to restrict the operation of the cover 2 so as to keep 2 in the closed position.

  According to the above configuration, since the association mechanism 3 regulates the operation of the cover 2 so as to keep the cover 2 in the closed position, the space formed in the portion where the cassette unit 1 is pulled out when the cassette unit 1 is in the pulling position is covered. 2 can cover.

  Further, the present invention provides a medicine supply apparatus M capable of supplying medicines in small portions, provided so as to be movable between a fixed position where the medicine can be supplied and a pulling position deviated from the fixed position. A cassette unit 1 that can be temporarily held in a closed state, a closed position that covers the cassette unit 1 from above when the cassette unit 1 is in a fixed position, and an open position where the cassette unit is exposed. A cover 2 movably provided between the cassette unit 1 and an association mechanism 3 for associating the operations of the cassette unit 1 and the cover 2, and the association mechanism 3 is configured to move the cassette 2 when the cover 2 is in the open position. The operation of the cassette unit 1 can also be restricted so as to keep the unit 1 at a fixed position.

  According to the above configuration, since the associating mechanism 3 regulates the operation of the cassette unit 1 so as to keep the cassette unit 1 in a fixed position, the cassette unit 1 is pulled out when the cover 2 is in the open position, thereby creating a space. Can be prevented.

  Further, the present invention provides a medicine supply apparatus M capable of supplying medicines in small portions, provided so as to be movable between a fixed position where the medicine can be supplied and a pulling position deviated from the fixed position. A cassette unit 1 that can be temporarily held in a closed state, a closed position that covers the cassette unit 1 from above when the cassette unit 1 is in a fixed position, and an open position where the cassette unit is exposed. A cover 2 movably provided between the cassette unit 1 and an association mechanism 3 for associating the operations of the cassette unit 1 and the cover 2, and the association mechanism 3 is configured to cover the cover when the cassette unit 1 is in the drawer position. Cover restricting means 31 for restricting the operation of the cover 2 so as to keep the cover 2 in the closed position, and the cassette 2 when the cover 2 is in the open position. The winding unit 1 can as that a cassette unit regulating means 32 for regulating the operation of the cassette unit 1 so as to maintain at a fixed position.

  According to the above configuration, since the cover restricting means 31 restricts the operation of the cover 2 so as to keep the cover 2 in the closed position, the space that can be formed in the portion where the cassette unit 1 is pulled out when the cassette unit 1 is in the pull-out position. Since the cover 2 can be covered and the operation of the cassette unit 1 is restricted so that the cassette unit restricting means 32 keeps the cassette unit 1 in a fixed position, the cassette unit 1 is pulled out when the cover 2 is in the open position. Can be prevented from forming a space.

  In the present invention, the cover regulating means 31 includes a first cover regulating member 311 provided on one of the cover side and the cassette unit side, and a second cover regulating member 312 provided on the other side, The first cover regulating member 311 has a hooking portion 311a, and the second cover regulating member 312 includes a hooked portion 312a that is a portion that can be hooked to the hooking portion 311a, and the hooked portion 312a. The cover restricting means 31 is configured such that when the cassette unit 1 is at least in the pulled-out position, the hooking portion 311a and the hooked portion 312a are hooked. The cover 2 is restricted from moving to the open position, and the cover restricting means 31 is configured so that the cassette unit 1 is positioned. When in the can and that the hook portion 311a is allowed to move to the cover 2 is opened position by passing through the opening portion 312b.

  According to the preferred configuration, the cover restricting means 31 can be configured by the hooking portion 311a, the hooked portion 312a, and the opening portion 312b, and the cover 2 is kept in the closed position so as to keep the cover 2 in the closed position. The operation can be regulated and allowed.

  In the present invention, the cassette unit restricting means 32 includes a first cassette unit restricting member 321 provided in a portion other than the cassette unit 1 and a second cassette unit restricting member 322 provided in the cassette unit 1. The first cassette unit regulating member 321 is interlocked with the opening / closing operation of the cover 2, and the second cassette unit 1 is regulated so as to regulate the drawer of the cassette unit 1 when the cover 2 is in the open position. It can also be engaged with the cassette unit regulating member 322.

  According to the preferred configuration, the cassette unit regulating means 32 can be constituted by the first cassette unit regulating member 321 and the second cassette unit regulating member 322 engaged with the first cassette unit regulating member 321, and has a relatively simple configuration. However, the operation of the cassette unit 1 can be regulated so as to keep the cassette unit 1 in a fixed position.

DESCRIPTION OF SYMBOLS 1 Cassette unit 10 Cassette main body 2 Cover 3 Association mechanism 4 Cassette unit removal control means 31 Cover control means 311 1st cover control member 311a Hook part 312 2nd cover control member 312a Hook part 312b Open part 312s Space 32 Cassette unit control means 321 First cassette unit regulating member 322 Second cassette unit regulating member M medicine supply device

Claims (3)

In a medicine supply device that can supply medicine in small portions,
It is a cassette unit that can be moved between a fixed position where the medicine can be supplied and a pull-out position shifted from the fixed position, and can be temporarily removed in the state where the medicine is subdivided. A cassette unit having a cassette body,
A cover provided so as to be movable between a closed position covering the cassette unit from above when the cassette unit is in a fixed position and an open position where the cassette unit is exposed;
An association mechanism for associating the operations of the cassette unit and the cover,
The association mechanism regulates the operation of the cover so as to keep the cover in the closed position when the cassette unit is in the drawer position;
The medicine supply device, wherein the cassette main body can be removed from the cassette unit when the cassette unit is in a pull-out position. In a medicine supply device that can supply medicine in small portions,
It is a cassette unit that can be moved between a fixed position where the medicine can be supplied and a pull-out position shifted from the fixed position, and can be temporarily removed in the state where the medicine is subdivided. A cassette unit having a cassette body,
A cover provided so as to be movable between a closed position covering the cassette unit from above when the cassette unit is in a fixed position and an open position where the cassette unit is exposed;
An association mechanism for associating operations of the cassette unit and the cover;
A cassette unit removal restricting means for restricting the cassette body from being removed from the cassette unit;
The association mechanism regulates the operation of the cassette unit so as to keep the cassette unit in a fixed position when the cover is in the open position.
The cassette unit removal restricting means restricts the removal of the cassette body from the cassette unit when the cassette unit is in a fixed position.   The medicine supply device according to claim 2, wherein the cassette unit removal restricting means restricts the cassette body from moving upward from the position of the cassette body at the fixed position.

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