Abstract:
The present invention intends to let the medicine fall regularly, by eliminating the static electricity charged on the medicine in the medicine case. A medicine case comprising a medicine case portion for containing medicine in the upper part and a mechanism unit in the lower part, the mechanism unit having a inflow passage where inflows medicine in the medicine case section and a guide face for guiding medicine into this inflow passage, an alignment body rotated or shaken by a driving unit and a fixing plate having a partition interposed in the way between a medicine chute passage communicating with the inflow passage and the inflow passage, wherein a self-dischargeable cloth having an area opposed at least to the slide area due to the shake, or, rotation of the alignment body is arranged, outside this medicine case, prevents this alignment body, the medicine and the portion of the medicine case section susceptible to be charged by mutual rubbing from being charged, and in case they are charged, they discharge and, therefore a failed discharge where the medicine is not discharged can be prevented as far as possible.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention concerns a medicine packing apparatus, in a hospital or other institutions, for filling a container (bottle, bag and so on) with medicines contained in the container (hereinafter, the medicine shall include all preparations in solidified form such as tablets, capsules, pills, troches) by a quantity indicated on a prescription.  
           [0003]    2. Detailed Description of the Prior Art  
           [0004]    Conventionally, in the hospital or preparation pharmacy, tablets prescribed by a doctor are dispensed to the patient, using a medicine dispenser described in Utility Model Publication No. 1982-7660 (B65D83/04), for instance. Such a method consisted in discharging tablets (medicine) of the quantity described in the prescription one by one from a discharge drum (called alignment table in the Publication) in a tablet case (medicine case). Then the tablets are collected by means of hopper or conveyer or the like and packed.  
           [0005]    In this case, a plurality of ditches (alignment holes) are formed up and down on the side face of the discharge drum in the tablet case and, medicines that are solidified preparations such as tablets, capsules, pills, troches enter in these respective ditches in a line vertically. Then, if the discharge drum is rotated in this state, the medicine falls from a ditch mating with the outlet (chute hole) and, at the same time, fallen medicines were counted one by one by a discharge count means disposed in the vicinity of the outlet.  
           [0006]    By the way, these tablet case, discharge drum and others are ordinary molded with synthetic resin in consideration of not only security and hygiene, but also complexity of manufacturing, prevention of medicines&#39; damage and so on. In addition, as many medicines are encapsulated, static electricity has been generated and charged on the medicine due to friction between the rotating discharge drum and the medicine, or friction between medicines each other, or friction between the tablet case and medicines, when the discharge drum is rotated.  
           [0007]    Thus, when the electrostatic charge is generated on medicines in a tablet case, since the medicines are very light, they are absorbed to the inner face of the tablet case or the discharge drum and do not fall even if the discharge drum is rotated.  
           [0008]    As an invention to reduce the electrostatic charge, the one disclosed in Laid-Open Japanese Patent Publication No. 1997-95312 is known. The invention has certain effect of reducing the electrostatic charge, but it cannot completely eliminate the electrostatic charge and, therefore, it is not satisfactory.  
           [0009]    The present invention has been devised in order to solve such technical problems of the prior art and provides a medicine packing apparatus that can let a medicine fall smoothly, by eliminating the static electricity charged on medicines in a medicine case.  
         SUMMARY OF THE INVENTION  
         [0010]    The medicine packing apparatus of the present invention is a medicine case comprising a medicine case portion for containing medicine in the upper part and a mechanism unit in the lower part, the mechanism unit having an inflow passage where inflows medicine in the medicine case portion and a guide face for guiding medicine into this inflow passage, an alignment body rotated or shaken by a driving unit and a fixing plate having a partition interposed in the way between a medicine chute passage communicating with the inflow passage and the inflow passage, wherein a self-dischargeable cloth having an area opposed at least to the slide area of the alignment body is arranged, outside this medicine case.  
           [0011]    Moreover, a medicine case, wherein a self-dischargeable cloth having a breadth of at least 20 mm in the upper part of the inflow passage, or, at least five tablets of the medicine is arranged all around the outside of the medicine case.  
           [0012]    In addition, a medicine case, in which a self-dischargeable cloth having an area opposing at least to the slide area of the alignment body, and having a breadth of at least 20 mm in the upper part of the inflow passage or at least five tablets of the medicine is arranged, outside this medicine case.  
           [0013]    Further, the one wherein the self-dischargeable cloth is pasted to the medicine case with an electroconductive two-sided tape from outside.  
           [0014]    Moreover, a medicine packing apparatus, comprising the medicine case of any of those described above. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0015]    [0015]FIG. 1 is a perspective view of a medicine case at the interposed position of the partition of the alignment body;  
         [0016]    [0016]FIG. 2 is a perspective view of a medicine case at the released position of the partition of the alignment body;  
         [0017]    [0017]FIG. 3 is an exploded view of the medicine case;  
         [0018]    [0018]FIG. 4 is a perspective view of a tablet packing machine; and  
         [0019]    [0019]FIG. 5 is an illustrative drawing showing the comparative test of the present invention. 
     
    
     DESCRIPTION OF SYMBOLS  
       [0020]    [0020] 1  Medicine packing machine (medicine packing apparatus)  
         [0021]    [0021] 6  Medicine case  
         [0022]    [0022] 12  Medicine case portion  
         [0023]    [0023] 13  Mechanism unit  
         [0024]    [0024] 59  Alignment body  
         [0025]    [0025] 60  Ditch (inflow passage, chute passage)  
         [0026]    [0026] 61  Guide face  
         [0027]    [0027] 62  Alignment member  
         [0028]    [0028] 63  Notch  
         [0029]    [0029] 64  Slit  
         [0030]    [0030] 65  Partition  
         [0031]    [0031] 66  Fixing plate  
         [0032]    [0032] 70  Driving unit  
         [0033]    A 2 , A 3 , A 4  Self-discharge cloth (self-dischargeable cloth)  
       DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0034]    Now, an embodiment of the present invention shall be described based on the drawing.  
         [0035]    [0035] 1  is a tablet packing machine (medicine packing apparatus) for tablets among medicines. This packing machine comprises a casing having a medicine containing portion  2  on the upper part thereof and a packing machine portion  3  on the lower part thereof, a plurality of medicine cases arranged flatly by inserting into a lattice-like partition  5  of the medicine containing portion  2 , and formed in a vertically elongated form, a dispensing mechanism  7  for taking out a predetermined number of tablets from the lower part of those selected from these medicine cases and batch dispensing into a packing bag, and a control unit  8  for controlling the tablet pick-up operation of the medicine case and the tablet dispensing operation or others of the dispensing mechanism, for seal-package the packing bag where tablets are dispensed.  
         [0036]    A sliding door  9  is mounted to the top face of the casing  4 , and the top face opens by sliding the door, to expose the lattice-like partition  5  and the upper part of the medicine case  6  arranged between the partitions. The partitions are disposed in 12 rows in the depth direction, and composed as a module by 10 lines per unit. (, where these rows and lines are not limited to this) Consequently, 1 module corresponding to 120 tablets can contain 120 kinds of tablets, namely, 120 medicine cases  6 , and a composition for containing 120, 240, 360, 480 kinds and so on can be realized by linking a plurality of the modules. A step-like bottom plate  10  depressed in the center is disposed under the lattice-like partition  5 , and an electric connector  11  is mounted to a portion of the bottom plate where the medicine case  6  contacts.  
         [0037]    There, the medicine case  6  is electrically connected with the control unit  8  by inserting into the electric connector  11 , for receiving and delivering driving signal or detection signal.  
         [0038]    It should be noted that, as the bottom plate  10  is formed into a step shape, it can contain two kinds of medicine case  6 A and  6 B, different in length as shown by chained line in FIG. 4, and it is so made to be able to contain an appropriate number of tablet even when the size of tablet is different.  
         [0039]    The medicine case  6  is formed into a vertically elongated pillar shape (300 mm in length) as mentioned above, a cylindrical (ø 46 mm) transparent medicine case portion  12  for containing tablets is formed on the upper part and a square pillar shape mechanism unit  13  is formed detachably on the lower part.  
         [0040]    The mechanism unit  13  is comprised of an alignment body  59  having a guide face  61  inclined with a downward slope toward a ditch { 60 } (inflow passage, chute passage) for vertically aligning a plurality of tablets in one place on the side part and an alignment member  62  protruding circularly on the guide face  61  in a way to define an tablet passage around the outer circumference, bearing body  98  having a semicircular plate shape mounted to the case so as to bear a driving shaft  99  of this alignment body, a disk shape fixing plate  66  having a notch  63  for dropping tablets in a portion of the outer periphery in which a partition  65  interposing in a slit  64  formed in the middle of the ditch  60  is fitted, a support base  67  having a square pillar shape, a linkage frame  100  for linking this support base and the medicine case portion  12 , an shake mechanism  68  for shaking the alignment body  59  between a position where the partition  65  interposes in the ditch  60  (position shown in FIG. 1) and a position where it does not interpose (position shown in FIG. 2) taking the driving shaft  99  installed at the center of the alignment body as a fulcrum, and a driving unit  70  comprising a gear reducer (not shown) built in the support base  67  in order to drive this shake mechanism  68  and a DC motor  69 . It should be noted that the shake angle of the alignment body  59  is about 90 degrees.  
         [0041]    The partition  65  attached on the fixing plate  66  is supported by a support  72  through a long hole  71  and, at the same time, biased to a direction shown by the arrow in FIG. 2 by a spring  73  at all times.  
         [0042]    The shake mechanism  68  is comprised of an eccentric pin  74  linked to the DC motor  69  via the gear reducer, an shake plate  79  supported by the support  76  at one end for engaging the eccentric pin  74  in a long ditch  77  provided on the middle bottom face and at the same time having a shake pin  78  (vertically expandable) protruded on the top face of the other end, a sector-formed connecting piece  84  for engaging a kerf ditch  80  formed on one end with the shaking pin  78  and at the same time linking a support  81  protruded on the top face of other end to a driving shaft  99  of the alignment body  59 .  
         [0043]    [0043] 85  is a detector mounted detachably to the top face of the support base  67  in connection with a tablet chute passage  86  provided on the side face of the support base  67 , having a structure wherein a light emission element  88  and a light-receiving element  89  are opposed in a central concave  87  and a signal is generated by a tablet passing through the recess  87  and interrupting the light.  
         [0044]    The alignment body  59  constituting the mechanism unit  13  and the fixing plate  66  are mounted in the medicine case portion  12 , presenting a structure wherein components above the connecting piece  84  and components below the shaking plate  79  in FIG. 3 are further separated by the linkage frame  100 .  
         [0045]    In thus composed medicine case  6 , when a tablet pickup signal from the control unit  8  is dispensed, the DC motor  69  constituting the driving unit  70  rotates, and the rotation movement shall be converted into the shake movement by the eccentric pin  74  and the shaking plate  79 . This shake movement is transmitted to the alignment body  59  through the connecting piece  84 , and the alignment body  59  shakes horizontally between the position where the partition  65  interposes in the ditch  60  (position shown in FIG. 1) and the position where it does not interpose (position shown in FIG. 2) taking the driving shaft  99  of the alignment body as a fulcrum.  
         [0046]    The tablet contained in the medicine case portion  12  enters in the ditch  60  by the guide face  61 , but remains here because there is the partition  65  in the middle of the ditch  60  while the alignment body  59  is at the position of FIG. 1.  
         [0047]    Thereafter, when the alignment body  59  shakes and comes to the position of FIG. 2, the partition  65  will be absent in the ditch  60 , and the tablet in the lowest part stopped at the partition  65  falls on the fixing plate  66 . Then, the alignment body  59  starts to shakes again towards the position of FIG. 1, one tablet fallen on the fixing plate  66  is returned to the ditch  60  under the partition  65  and discharged through a notch  63  and the chute passage  86 .  
         [0048]    There, the falling tablet passes through the concave  87  of the detector  85 , a signal indicating that one tablet was discharged from the medicine case  6  is detected and the signal is sent to the control unit  8 .  
         [0049]    Here, the gear reducer in the support base  67  is set to reduce the revolution of the DC motor to the order of 1/100, the shaking plate  79  makes one round shake (movement from the position of FIG. 1 back to the position of FIG. 1 through the position of FIG. 2) by one revolution of the eccentric pin  74  and discharges one tablet. Time necessary for one round shake is 0.4 to 0.5 seconds, and tablets aligned in the ditch  60  and contained on the partition  65  fall instantaneously on the fixing plate  66 , and are separated by the partition  65  and let fall down.  
         [0050]    Besides, an alignment member  62  defining a tablet alignment ditch  102  between the peripheral face thereof and the medicine case  12  is mounted detachably on the guide face  61  of the alignment body  59 . In short, the alignment member  62  is mounted by engaging a leg  103  protruding on the bottom face in a hole  101  of the guide face  61 .  
         [0051]    The basic composition of the tablet packing machine (medicine packing apparatus) of the present invention is as mentioned above, and in the one according the present invention, furthermore, a self-dischargeable cloth (“self-discharge cloth”, hereinafter) is pasted to the medicine case. Several kinds of tests for confirming an appropriate discharge of medicine has been executed by changing the position and size of this self-discharge cloth, as described below.  
         [0052]    First of all, the medicine discharge test (discharge test  1 ) has been performed for a non countermeasure medicine case for which no countermeasure has been taken (sample 1), a medicine case wherein a JIS standard steel plate (SUS) is applied to the inside of the case inside (sample 2) and a medicine case in which a self-discharge cloth is applied from the outside of the case (sample 3).  
         [0053]    The self-dischargable cloth is a woven fabric blends stainless short fibers (electroconductive fiber) in polyester filament yarn having a characteristic of provoking a weak corona discharge between fine lines and electro static charges, when the electroconductive fiber (line diameter around 10 μm) approaches a charged body (charged case or medicine), which obtains a static eliminating ability of static electricity, and eliminates static electricity of the charged object.  
         [0054]    In this test, the number of failed discharge of the samples 1, 2, 3, namely the number of medicines not discharged by one swing of the alignment body  59  was measured. It should be noted that the number of swings was set to 3600.  
         [0055]    If the number of failed discharges for the sample 1 is set to 100%, the number of failed discharge for the sample 2 was about 52%, and about 34% for the sample 3.  
         [0056]    According to this result, it was found that the sample 2 and the sample 3 have, though insufficient, an effect of reducing the failed discharge.  
         [0057]    The Inventor has estimated that it would be possible to reduce furthermore the number of failed discharges by devising the position or area of application of the self-discharge cloth, for the sample 3 which has presented the best results, and performed the following test.  
         [0058]    It should be noted that an electroconductive two-sided tape was used to paste the self-dischargable cloth of the sample 1. This is because it could be confirmed that the self-discharge does not occur in case of using a commercialized non-electroconductive two-sided tape, by measuring the electric potential. Consequently, an electroconductive two-sided tape is used for all of applications of the self-discharge cloth.  
         [0059]    The sample 4 is the one wherein the medicine case is covered with a self-discharge cloth A 1  for about one third round (about 120 degrees) of the upper part from the ditch (inflow passage).  
         [0060]    The sample 5 is the one in which a portion opposed to the sliding area (area which shakes) of the alignment body  59  of the medicine case is covered with a self-discharge cloth A 2 , about one third of a round (about 120 degrees) . This portion is covered relatively largely to cover it securely, because the shake angle of the alignment body  59  is about 90 degrees.  
         [0061]    For the sample 6, the height position for pasting the self-dischargable cloth is same as the sample 5, but one round (full circle, 360 degrees) is covered.  
         [0062]    In the sample 7, positions of the sample 4 and the sample 5 are covered with a single self-discharge cloth A 4 , about one third round (about 120 degrees).  
         [0063]    It should be noted that the height dimension L is substantially equal to the dimension of the ditch  60  and, substantially equal to the height dimension of the alignment body  59 . Besides, the height dimension M is set to 50 mm and, at least the upper part of the ditch (inflow passage)  60  is set to 20 mm or more, or to a dimension relatively larger than the height dimension of at least five or more tablets of the medicine.  
         [0064]    The number of failed discharge, namely the number of times where a single medicine was not discharged by one swing of the alignment body  59 , was measured by using the samples 4, 5, 6, 7.  
         [0065]    In short, a test  2  for controlling to discharge 1200 tablets in total by repeating a cycle of filling the case with 1250 tablets, discharging 100 tablets, taking an interval of 60 sec, discharging again 100 tablets, . . . was executed.  
         [0066]    The number of failed discharge in the test  2  was, respectively, 248 tablets for the sample 4, 272 tablets for the sample 5, 25 tablets for the specimen  6  and 0 tablet for the sample 7.  
         [0067]    Consequently, it can be understood that the sample 7 is the best, and the number of failed discharge is substantially low for the sample 6.  
         [0068]    Next, using the samples 4, 6, 7, a test  3  consisting in discharging continuously 1200 tablets, without the interval, was executed. Note that the sample 5 was eliminated from the test, because the result of the test  2  was the worst.  
         [0069]    The number of failed discharged in this test  3  was respectively,  439  tablets for the sample 4, 25 tablets for the sample 6 and 0 tablet for the sample 7.  
         [0070]    Consequently, it can be understood that the sample 7 had no failed discharge and the sample 7 is the best embodiment. It is supposed that this is because the sliding portion of the alignment body  59 , and the portion where the mutual friction of tablets is maximum (upper part of the ditch  60 ) are covered with a self-discharge cloth to prevent this portion from being charged, and in case of static build-up, it was discharged.  
         [0071]    Moreover, it is found that the sample 6 has quite small number failed discharge and can considerably reduce the number of the failed discharge, although it cannot be the as the best one. It is supposed that this is because the portion where tablets rub each other is covered with a self-discharge cloth, all around the cartridge, to prevent this portion from being charged, and if charged, it was discharged.  
         [0072]    Though in the embodiment, the one in which the alignment body  59  shakes has been described, it may be applied to those wherein the discharge drum (alignment body) rotates, as the one described in Japanese Patent Laid-Open Publication No. 1997-95312. In this case, a large cloth is required, because it is necessary to paste a self-dischargeable cloth to the area corresponding to the revolution area of the discharge drum (full circle), at least 20 mm of the upper part of the inflow passage, or, the area of the full circle of the height corresponding to at least five medicines.  
         [0073]    As mentioned hereinabove, according to the invention of claim 1, as the portion of shake of the alignment body is prevented from being charged, and if charged, it can be discharged, medicines can be prevented from being stuck to and not discharged.  
         [0074]    Moreover, according to the invention of claim 2, the portion-the portion at least 20 mm in the upper part of the inflow passage, or in the height of at least five tablets of medicine-where medicines rub each other to be easily charged is prevented from being charged, and even if charged, it can be discharged. As a result, medicines can be prevented from being stuck to and not discharged.  
         [0075]    In addition, according to the invention of claim 3, both the portion where the alignment body shakes and the portion where medicines rub each other to the maximum are prevented from being charged, and even if charged, they can be discharged. Therefore, medicines can be prevented from being stuck to and not discharged.  
         [0076]    Further, according to the invention of claim 4, as a self-dischargeable cloth is pasted by an electroconductive two-sided tape, antistatic function or electric discharge function are not inhibited, it is prevented from being charged, and if charged, they can be discharged, and therefore, medicines can be prevented from being agglomerated and not discharged.  
         [0077]    Moreover, according to the invention of claim 5, the medicine case of any one of claims 1 to 4 being provided, medicines can be prevented from being not discharged and time for packing medicine can be shortened.