Abstract:
A powder grain material control unit has a cylindrically formed filter and a negative pressure chamber formed at the outer periphery of the filter. As powder grain material is discharged from an outflow portion of the powder grain material control unit, the inner peripheral portion side of the cylindrical filter is negatively pressurized so as to absorb and maintain the powder grain material of this part on the cylindrical filter side and so as to stop the discharge of the powder grain material flowing on the inner peripheral portion side of the cylindrical filter. The control unit may be used in combination with a powder grain filling unit that includes material carrying means which may be an auger having a spiral blade provided with a central axis of rotation.

Description:
BACKGROUND OF THE INVENTION 
     This invention relates to a powder grain material control unit for stopping the discharge of the powder grain material and a powder grain material filling unit providing this unit with the powder grain material outflow portion for filling with powder grain material. 
     In medicines and foodstuff, powder or grain (called “powder grain material” in a general term) is existent in the past. Generally, in many cases, the powder grain material is dealt with by packing in a bag or a container. 
     A powder grain material filling unit as shown in FIG. 10 is one instance of the unit for filling a bag with the powder grain material. 
     This powder grain material filling unit  20  has a hopper  22  in the shape of a cone provided with a support frame  21  for storing the powder grain material, a drop guide cylinder  23  provided with the lower portion of the hopper  22  for guiding the drop of the powder grain material, a rotatable auger (another name is a screw)  25  connected with a driving motor  24  positioning on the upper portion of the hopper  22  and stored in the drop guide cylinder, and a powder grain material control unit  26  provided with the drop guide cylinder  23  for stopping the discharge of the powder grain material from the drop guide cylinder  23 . 
     The powder grain material control unit  26  has a pair of plungers  27 ,  27  provided with the drop guide cylinder  23 , and a switch valve  28  in the shape of a cone made of resin, for opening and closing a powder grain material outflow portion  23   a  of the drop guide cylinder  23 , going up and down by these plungers  27 . 
     When the driving motor  24  is started to operate so as to rotate the auger  25  after the powder grain material is entered in the hopper  22 , the powder grain material in the hopper flows in the drop guide cylinder  23 . But, the drop of the powder grain material is adjusted so as to transfer to the lower hand by the rotating auger  25 . 
     When the plungers  27  of the powder grain material control unit  26  are not operated, the switch valve  28  opens the powder grain material outflow portion  23   a  of the drop guide cylinder  23 , being away from the lower portion of the drop guide cylinder  23 . The powder grain material P drops in a transparent vinyl bag  29 , for instance, receiving the lower portion of the drop guide cylinder  23 . 
     When a predetermined quantity of the powder grain material drops in a vinyl bag, the plungers  27  are operated so as to pick up the switch valve  28 . The switch valve  28  adheres to the powder grain material outflow portion  23   a  of the drop guide cylinder  23  and closes the powder grain material outflow portion  23   a  so as to stop the discharge of the powder grain material. 
     Lastly, a pair of bag closing pieces  30  (seen as one in FIG. 10 since they overlap each other) approach each other from the front and the back of the vinyl bag  29  (the direction of the inside and the outside of the paper) so as to hold the upper portion of the vinyl bag  29 . A pair of the bag closing pieces  30  are heated and the vinyl bag  29  is sealed by melting and adhering the vinyl to each other. 
     On this occasion, the vinyl bag is formed by closing the vinyl cylinder supplied enclosing the powder grain material control unit with the bag closing pieces  30 . 
     But, the following problems are existent since the conventional powder grain material control unit  26  stops the discharge of the powder grain material by adhering the switch valve  28  in the shape of a cone to the powder grain material outflow portion  23   a.    
     That is, the powder grain material is held between the switch valve  28  and the powder grain material outflow portion  23   a,  then the space generates, then, the discharge of the powder grain material can not be completely stopped since the powder grain material continues to slightly flow from the space. 
     If it is used for a long time, wear and tear generate at the portion of the switch valve made of resin contacting the powder grain material outflow portion  23   a.  Then, the powder grain material outflow portion  23   a  can not be certainly sealed by the switch valve  28 , so it is necessary to change the switch valve. 
     The sound of operating a pair of plungers  27  is the origin of noise. 
     The switch valve  28  and the powder grain material outflow portion  23   a  vibrate by the vibration of a pair of plungers  27  at the time of operating, and the portion contacting the switch valve  28  and the powder grain material outflow portion  23   a  with each other is shifted from each other so as to generate a space. Then, the powder grain material may drop from the space. 
     It is difficult to make the switch valve  28  the smaller since it is provided with a switch valve support plate  31  interlocking the plungers  27 . 
     Besides, the powder grain material filling unit having the above-mentioned conventional powder grain material control unit which can not certainly stop the discharge of the powder grain material has the following problems. 
     The quantity of filling the powder grain material varies widely and the accuracy of filling is bad. 
     It is impossible to make the minimum size of a bag small since the switch valve support plate  31  interlocking the plungers  27 , supporting the switch valve  28  is entered in the bag. 
     Since the powder grain material discharged from the powder grain material outflow portion  23   a  drops, hitting the switch valve  28  and the switch valve support plate  31  crossing the lower hand of the powder grain material outflow portion  23   a,  it is blown up in the bag in case of a transparent bag, so the degree of transparency in the bag  29  is reduced. Then, it is difficult to confirm the filling state in the bag  29  from the outside. 
     In case of a vinyl bag, the powder grain material being blown up in the vinyl bag  29  also adheres to the upper portion of the inside of the vinyl bag  29 . When the vinyl bag  29  is sealed by melting and adhering the upper portion of the vinyl bag  29  with a pair of bag closing pieces  30  heated, it is hard to adhere vinyl to each other. Then, it is difficult to completely seal the vinyl bag  29 . 
     For instance, the measuring accuracy of the weight measuring means for measuring the weight of the powder grain material is reduced by the vibration of a pair of plungers  27  at the time of operating, so it is difficult to improve the filling accuracy. 
     Then, there is the unit having a butterfly valve (not shown) for opening and closing the powder grain material outflow portion by a rotatable switch valve as the powder grain material control unit wherein vibration is few. 
     In this powder grain material control unit, the switch valve rotates and vibration is few, but the powder grain material is held between the switch valve and the inner wall of the powder grain material outflow portion. Then, a space generates, and the powder grain material may drop out from the space. 
     Besides, when the powder grain material is held between the switch valve and the inner wall of the powder grain material outflow portion, the switch valve may not be opened thereafter. 
     Anyway, the conventional powder grain material control unit may not certainly and speedily stop the discharge of the powder grain material since the discharge of the powder grain material is stopped with mechanical operation by adhering the parts to each other and then, a space generates between the parts for stopping the discharge of the powder grain material. 
     SUMMARY OF THE INVENTION 
     The object of the present invention is to provide the powder grain material control unit for certainly and speedily stopping the discharge of the powder grain material with no mechanical operation by adhering the parts to each other. 
     Besides, the object of the present invention is to provide the powder grain material control unit having few necessity of changing the parts by making it such a structure that no wear and tear generates on the parts after using for a long time. 
     Besides, the object of the present invention is to provide the powder grain material control unit having few vibration and noise by making it such a structure that there is few vibration. 
     Besides, the object of the present invention is to provide the small-sized powder grain material control unit with no member crossing the lower hand of the powder grain material outflow portion. 
     Besides, the object of the present invention is to provide the powder grain material control unit having no non-operable state by making it such a structure that the powder grain material is not held. 
     Besides, the object of the present invention is to provide the powder grain material filling unit wherein filling quantity does not widely vary and filling accuracy is high having the above-mentioned powder grain material control unit for certainly stopping the discharge of the powder grain material. 
     Besides, the object of the present invention is to provide the powder grain material filling unit wherein the minimum size of a bag can be smaller, having the above-mentioned small-sized powder grain material control unit. 
     Besides, the object of the present invention is to provide the powder grain material filling unit wherein the powder grain material is not hard blown up in the bag and the filling state in the bag is easily confirmed from the outside in case of a transparent bag, having the above-mentioned powder grain material control unit having no parts on which the powder grain material discharged from the powder grain material outflow portion hits during dropping. 
     Besides, the object of the present invention is to provide the powder grain material filling unit wherein the powder grain material is not hard blown up in the vinyl bag in case of a vinyl bag, then the degree of melting and adhering the vinyl to each other is increased so as to completely seal the vinyl bag, having the above-mentioned powder grain material control unit having no parts on which the powder grain material discharged from the powder grain material outflow portion hits during dropping. 
     Besides, the object of the present invention is to provide the powder grain material filling unit wherein the measuring accuracy of the weight measuring means for measuring the weight of the powder grain material is improved, for instance, so as to improve the filling accuracy, having the above-mentioned powder grain material control unit wherein vibration is few. 
     The powder grain material control unit of the present invention has a cylindrical filter cylindrically formed and a negative pressure chamber formed at the outer periphery of the cylindrical filter, having such a characteristic that the air in the negative pressure chamber is absorbed, and the inner peripheral portion side of the cylindrical filter is made more negative pressure than a predetermined so as to stop the discharge of the powder grain material flowing in the inner peripheral portion of the cylindrical filter by attaching the cylindrical filter and the negative pressure chamber to the powder grain material outflow portion from which the powder grain material discharges. 
     The powder grain material control unit of the above-mentioned present invention is used by attaching to the powder grain material outflow portion. The powder grain material goes out from the powder grain material outflow portion and is discharged passing through the inside of the inner peripheral portion of the cylindrical filter. 
     In order to stop the discharge of the powder grain material, the air in the negative pressure chamber is absorbed so as to make the inside of the inner peripheral portion of the cylindrical filter negative pressure than a predetermined. The powder grain material is absorbed on the inner wall of the cylindrical filter so as to make a secondary filter layer by the powder grain material. The air of the powder grain material in the inner peripheral portion of the cylindrical filter passes through the secondary filter layer by the powder grain material and the cylindrical filter so as to absorbed in, thereby the powder grain material is absorbed and maintained on the cylindrical filter side. 
     The secondary filter layer is the fixed layer of the powder grain material made at the inner periphery of the cylindrical filter, and the quantity of its airflow, that is, the powder of absorbing and maintaining the powder grain material can be adjustable by the quantity of absorbing air in the negative pressure chamber. Besides, the cylindrical filter is not directly contacted with the powder grain material inside the secondary filter layer by the secondary filter layer itself, and blocking does not generate as long as the airflow of the secondary filter layer lasts. Accordingly, the secondary filter layer is not the layer made by the blocking of the filter cylinder, but it prevents the fine grain of the powder grain material inside the secondary filter layer from reaching the filter cylinder so as to prevent the blocking of the filter cylinder and to improve the efficiency of absorbing air. 
     With the absorption of air, the powder grain material inside the inner peripheral portion of the cylindrical filter is blocked at the inner hand of the cylindrical filter in a hardened state and high density state so as to stop the discharge. 
     That is, the powder grain material can stop the discharge and the powder grain material itself serves as a valve for stopping the flow of the powder grain material so as to stop the discharge of the powder grain material thereafter. 
     As mentioned above, the powder grain material control unit of the above-mentioned invention does not stop the discharge of the powder grain material by adhering the parts to each other, but stops the discharge of the powder grain material by making the inside of the cylindrical filter negative pressure, and besides, it makes the powder grain material, to which the discharge is stopped, do the role of a valve for stopping further discharge of the powder grain material so as to stop the discharge of the powder grain material with no mechanical operation, correctly and speedily. 
     In the powder grain material control unit of the present invention, the powder grain material outflow portion faces downwardly, the inner peripheral portion side of the cylindrical filter is made negative pressure rather than the predetermined so as to stop the flow of the powder grain material flowing in the inner peripheral portion of the cylindrical filter, and it is made pressure which does not exceed the predetermined negative pressure so as to discharge the powder grain material in the cylindrical filter. 
     The powder grain material control unit of the present invention can stop the discharge of the powder grain material flowing in the inner peripheral portion of the cylindrical filter when the inner peripheral portion side of the cylindrical filter is made negative pressure rather than the predetermined. And, the powder grain material in the cylindrical filter is discharged since the absorption with respect to the cylindrical filter is released when the inner peripheral portion side of the cylindrical filter is made the pressure which does not exceed the predetermined negative pressure. 
     In the powder grain material control unit of the present invention, by providing the powder grain material carrying means for pushing out the powder grain in the guide cylinder which guides the powder grain material and making the top end of the guide cylinder the powder grain material outflow portion, the powder grain material control unit of the present invention discharges the powder grain material by the operation of the powder grain material carrying means and stops the discharge of the powder grain material by stopping the operation of the powder grain material carrying means in such a state that the inner peripheral portion side of the cylindrical filter is made the negative pressure rather than the predetermined. 
     The powder grain material control unit of the present invention is attached to the powder grain material outflow portion of the top end of the guide cylinder. The powder grain material is carried in the guide cylinder by the powder grain material carrying means and is entered in the cylindrical filter. On the other hand, the inner peripheral portion side of the cylindrical filter is made the negative pressure rather than the predetermined. 
     The powder grain material carried in the cylindrical filter is always maintained at the inner peripheral portion side of the cylindrical filter in a hardened and high density state. 
     When the operation of the powder grain material carrying means is stopped, the powder grain material is still maintained inside the cylindrical filter in blocking state by the negative pressure so as to stop the flow. 
     When the powder grain material carrying means is operated, the powder grain material is carried and discharged. When the powder grain material blocking in the cylindrical filter is discharged, new powder grain material is entered in the cylindrical filter so as to maintain in this filter. 
     Then, the powder grain material control unit of the above-mentioned invention discharges the powder grain material held by the cylindrical filter by the operation of the powder grain material carrying means. 
     In order to discharge the powder grain material, the absorption of air may be stopped so as to release the negative pressure of the inner peripheral portion side of the cylindrical filter and the absorption of air may be reopened just before stopping the discharge of the powder grain material so as to make the inner peripheral portion side of the cylindrical filter negative pressure. In this case, the change of the negative pressure helps the discharge of the powder grain material by the powder grain material carrying means. 
     The cylindrical filter of the powder grain material control unit of the present invention has the filter cylinder in the shape of cylinder, and the inside and the outside porous cylinders in the shape of a cylinder for respectively holding the inner periphery and the outer periphery of the filter cylinder through the gauze cylinders in the shape of a cylinder, and many air passage pores through which air passes are formed at the gauze cylinders and the inside and the outside porous cylinders. 
     The negative pressure chamber of the powder grain material control unit of the present invention is formed between the inner periphery of the casing which both ends of the cylindrical filter are fixed in a sealed state and the outer periphery of the cylindrical filter. 
     In the powder grain material control unit of the above-mentioned invention, the secondary filter layer generating on the cylindrical filter generates as the fixed layer of the powder grain material made in the space in the pores of the inside porous cylinder and the space between the outer periphery of the powder grain material carrying means and the inner porous cylinder, and the quantity of air passage can be adjusted by the quantity of absorbing air in the negative pressure chamber. Besides, the filter cylinder in the shape of a cylinder is not directly contacted with the powder grain material inside the secondary filter layer by the secondary filter layer itself, and blocking does not generate as long as the air passage of the secondary filter layer lasts. 
     The negative pressure chamber is formed between the inner periphery of the casing which both ends of the cylindrical filter are fixed in a sealed state and the outer periphery of the cylindrical filter. Then, when air is absorbed, the negative pressure chamber is made negative pressure. With this, the air in the cylindrical filter passes through the passage pores so as to enter in the negative pressure chamber. Then, the inner space of the cylindrical filter is also made negative pressure. In the result, the powder grain material is absorbed in the cylindrical filter so as to maintain. 
     The powder grain material carrying means projects from the powder grain material outflow portion in the discharge direction of the powder grain material a predetermined quantity. 
     The powder grain material carrying means projects in the discharge direction of the powder grain material and is entered in the powder grain material control unit provided with the powder grain material outflow portion. For this reason, the powder grain material carrying means certainly discharges the powder grain material maintained in the cylindrical filter of the powder grain material control unit. 
     The above-mentioned powder grain material carrying means operates with low speed at the first and the last stages of the discharge of the powder grain material, and operates with high speed during discharging. 
     The powder grain material carrying means improves the efficiency of discharging the powder grain material by operating with high speed during the discharge of the powder grain material. 
     The above-mentioned powder grain material carrying means is the auger having the spiral blade formed at the central axis of the rotation. 
     The auger carries the powder grain material by the rotation of the spiral blade. 
     The powder grain material filling unit of the present invention has the powder grain material storing means for storing the powder grain material, and any one of the above-mentioned powder grain material control units for filling the powder grain material storing body with the powder grain material supplied from the powder grain material storing means. 
     The above-mentioned powder grain material storing body is the vinyl bag formed in such a manner that the intermediate portion of the cylindrical vinyl cylinder supplied, enclosing the powder grain material control unit, is closed by the bag forming means to be closed by heat, and the vinyl cylinder goes down, filling with the powder grain material by the powder grain material control unit, and the upper portion rather than the intermediate portion is closed by the bag forming means. 
     The powder grain material control unit of the present invention does not stop the discharge of the powder grain material by adhering the parts to each other, but stops the discharge of the powder grain material by making the inside of the cylindrical filter negative pressure, and it makes the powder grain material which is stopped the discharge do the role of the valve for stopping the discharge of the powder grain material thereafter. Then, the following effects are exercised. 
     The discharge of the powder grain material can be certainly and speedily stopped. 
     Few vibration and noise generates. 
     The powder grain material is not held in the valve and there is no non-operable state. 
     Besides, in the powder grain material control unit of the present invention, it is not necessary to change parts since there is no parts on which wear and tear generates if it is used for a long time. 
     Furthermore, the powder grain material control unit of the present invention can be made small since there is no member crossing the lower hand of the powder grain material outflow portion. 
     Besides, when there is no member crossing the lower hand of the powder grain material outflow portion, the powder grain material does not hard blown up in the bag in case where the powder grain material storing body is a bag. Besides, in case of a transparent bag, the filling state in the bag can be easily confirmed from the outside. 
     Furthermore, if the powder grain material held by the cylindrical filter is discharged by the powder grain material carrying means, the powder grain material can be certainly and speedily stopped when the powder grain material carrying means is stopped. 
     Besides, if the powder grain material carrying means projects from the powder grain material outflow portion, it enters in the cylindrical filter so as to certainly discharge the powder grain material held in the cylindrical filter. 
     Furthermore, the discharge efficiency can be improved when the powder grain material carrying means is operated with high speed during the discharge of the powder grain material. 
     Since the powder grain material filling unit of the present invention has the above-mentioned powder grain material control unit for certainly stopping the discharge of the powder grain material, the quantity of filling is not widely changed and the accuracy of filling can be improved. 
     The powder grain material filling unit of the present invention can make the minimum size of the bag small by providing the above-mentioned small-sized powder grain material control unit. 
     Since the powder grain material filling unit of the present invention has no member crossing the lower hand of the powder grain material outflow portion, the powder grain material is not hard blown up in the bag. In case of a transparent bag, the filling state in the bag can be easily confirmed from the outside. Besides, in case where the bag is a vinyl bag, the powder grain material is not hard blown up in the vinyl bag, and the degree of melting and adhering the vinyl to each other can be improved and the vinyl bag can be completely sealed. 
     Since the powder grain material filling unit of the present invention has the above-mentioned powder grain material control unit having few vibration, the accuracy of measuring a weight measuring means, for measuring the weight of the powder grain material, for instance, can be improved so as to improve the accuracy of filling the powder grain material. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a front view of a powder grain material filling unit providing a powder grain material control unit which is one of the embodiment forms of the present invention; 
     FIG. 2 is a left side view of FIG. 1; 
     FIG. 3 is a plan view of FIG. 1; 
     FIG. 4 are a view obliquely seen a powder grain material outflow portion of the powder grain material filling unit and a view obliquely seen a powder grain material control unit disassembled; 
     FIG. 5 is a front sectional view showing the powder grain material outflow portion of the powder grain material filling unit and the powder grain material control unit; 
     FIG. 6 is a sectional view seen from arrows  6 — 6  in FIG. 5; 
     FIG. 7 is a plan view of a powder grain material distributing ring; 
     FIG. 8 is a front sectional view showing the powder grain material control unit in such a state that powder grain material is discharged and the powder grain material outflow portion of the powder grain material filling unit; 
     FIG. 9 is a front view showing the powder grain material filling unit of another embodiment form; and 
     FIG. 10 is a front view showing the powder grain material filling unit providing a conventional powder grain material control unit. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A powder grain material control unit and a powder grain material filling unit providing this unit of the embodiment forms of the present invention will now be explained hereinafter with respect to the accompanying drawings FIG.  1  through FIG.  9 . 
     (Composition of the powder grain material filling unit and the powder grain control unit) 
     As shown in FIG.  1  through FIG. 3, with a powder grain material filling unit  120 , a fixed leg  121 , a climbing leg  122  provided with the fixed leg  121  so as to be adjustable in its height position, a hopper  124  in the shape of a cone, for storing powder grain material, provided with a support frame  123  being united with the climbing leg  122 , a drop guide shaft  125  for guiding the drop of powder grain material, provided with the lower portion of the hopper  124 , a rotatable auger  127  (another name is a screw) stored in the drop guide shaft  125 , connected with a driving motor  126  provided with the upper portion of the climbing leg  122 , a powder grain material control unit  130  for stopping the discharge of powder grain material from the drop guide shaft  125 , attachably and detachably provided with the drop guide shaft  125 , and a powder grain material distributing ring  131  screwed down the lower portion of the powder grain material control unit  130 , are provided. 
     On the upper portion of the hopper  124 , an opening  132  for throwing powder grain material in, and a detection sensor  133  for detecting storage over of powder grain material in the hopper  124  are provided. 
     As shown in FIG. 4, a spiral blade  129  is provided with a rotation central axis  128  of the auger  127  so as to control the drop of the powder grain material in the drop guide shaft  125 . 
     The powder grain material control unit  130  has a filter layer  140  cylindrically formed, a casing  141  enclosing the outer periphery of the filter layer  140 , opening the inner periphery of the filter layer  140 , provided with a powder grain material outflow portion  125   a  of the drop guide shaft  125 , and a suction cap  142  provided with the upper portion of the casing  141 . 
     As shown in FIG. 5, the casing  141  has an upper flange  143  in the shape of a disc, an lower flange  144  providing a flange  145  with a cylindrical member, and an outside ring  146  uniting both flanges  143  and  144  with each other, in the shape of a cylinder. 
     The suction cap  142  is screwed on the upper flange  143  so as to form a suction pore  147  communicating with the suction cap  142 . A female screw  149  to be screwed on a screw  148  formed on the lower portion of the drop guide shaft  125  is formed on the inner periphery of the upper flange  143 . Furthermore, an annular projecting piece  150 , engaging with the upper inner periphery of the filter layer  140  is provided with the lower portion of the upper flange  143  so as to project for the lower direction. 
     A screw  152  to be screwed on a female screw  151  of the powder grain material distributing ring  131  is provided with the lower flange  144 . Furthermore, an annular projecting piece  153 , engaging with the lower inner periphery of the filter layer  140  is provided with the upper portion of the lower flange  144  so as to project for the upper direction. 
     The outside ring  146  is united with the upper flange  143  by welding, and is united with the lower flange  144  by a screw  154 . The connecting portion between the outside ring  146  and the lower flange  144  has no space by an O-ring  155  installed on the outer periphery of the lower flange  144 . 
     As shown in FIG. 6, with the filter layer  140 , an inside porous cylinder  160  in the shape of a cylinder, an inside gauze cylinder  161 , a filter cylinder  162 , and an outside gauze cylinder  163  are provided, layering in order from the inside, and an outside porous cylinder  164  is provided with the outermost side thereof. The outside porous cylinder  164  tight binds the whole filter layer  140  by tight binding the end portions of porous cylinder pieces  165 ,  165  divided in two in the shape of a semicircle by a bolt  166 . Besides, the inside porous cylinder  160  and the outside porous cylinder  164  prevents the deformation of the filter cylinder  162  through the inside gauze cylinder  161  and the outside gauze cylinder  163 , and many pores  167 ,  170  are formed. These pores  167  and  170  are formed at the position corresponding with each other so as to pass air through. The occupied area of the respective pores  167 ,  170  is about half of the outer peripheral area of the outside porous cylinder  164  or the inner peripheral area of the inside porous cylinder  160 . Besides, the air in powder grain material can be sucked into the pore  167  through a secondary filter layer described hereinafter. On this occasion, the gauze cylinder may be a gauze cylinder made of resin as well as metal. 
     The filter of the filter cylinder  162  having various kinds of structures can be used. But, in case where the grain size of the powder grain material is 5 micron or so, the finer mesh filter, for instance, the mesh filter having the size of 0.5 micron or so is preferable. As this filter, sintered type filter material molding and sintering metallic or non-metallic fiber or ceramic powder body, for instance, is used in view of filter accuracy and manufacturing accuracy. Besides, the inside gauze cylinder  161  and the outside gauze cylinder  163  reinforce the filter cylinder  162 , and are protecting layers for providing blocking of these surface. 
     In the powder grain control unit  130 , the upper and lower flanges  143 ,  144  and the outside ring  146  are united one another in such a manner that the filter layer  140  is installed on the annular projecting pieces  150 ,  153  of the upper and lower flanges  143 ,  144 , thereafter the outside ring  146  is installed on the upper and lower flanges  143 ,  144  so as to weld the upper flange  143  and the outside ring  146 , the lower flange  144  and the outside ring  146  are fastened by the screw  154 . Between the upper and lower flanges  143 ,  144  and the lower and upper ends of the filter layer  140 , gauze cylinders  177 ,  177  in the shape of a donut exist, and the upper and the lower ends of the filter layer  140  are sealed. 
     With the powder grain material distributing ring  131 , the female screw  151  to be screwed on the screw  152  formed at the lower portion of the powder grain material control unit  130  and a plurality of radial bars  171  are provided. 
     (Operation of the powder grain material filling unit and the powder grain material control unit) 
     The powder grain material control unit  130  is attached to the drop guide shaft  125  by screwing the female screw  149  of the upper flange  143  on the lower screw  148  of the drop guide shaft  125 . 
     As shown in FIG. 2, a bag  172  is stood by at the lower portion of the drop guide shaft  125 , the powder grain material is entered from the opening  132  of the hopper  124 , the driving motor  126  is started to drive, and the auger  127  is rotated so as to drop the powder grain material in the drop guide shaft  125  from the hopper  124  by its dead weight and the rotation of the auger  127 . Thereafter, the auger  127  is stopped. 
     And, when the air in a negative pressure chamber  176  between the outer periphery of the filter layer  140  and the inner periphery of the casing  141  is sucked by a pipe  173  connected with the suction cap  142 , the air of the inner peripheral portion IP side of the filter layer  140  in the state of being filled with the powder grain material, as shown in FIG. 8 is sucked, passing through the respective pores  167 ,  170  of the inside porous cylinder  160  and the outside porous cylinder  164 , the inside gauze cylinder  161 , the outside gauze cylinder  163  and the filter cylinder  162 . 
     On this occasion, the powder grain material at the position adjacent to the inner peripheral face of the filter layer  140  of the powder grain material of the inner peripheral portion IP side of the filter layer  140  is absorbed on the inner wall of the filter layer  140 , and is fastened and hardened, as shown in FIG. 8 so as to form a secondary filter layer  174  having a predetermined thickness by the powder grain material in the shape of a cylinder. This secondary filter layer  174  is the fixed layer of the powder grain material made in the space in the pore  167  of the inside porous cylinder  160  and the space between the outer periphery of the blade  129  and the inside porous cylinder  160 , and its air passing quantity is adjustable by the air absorbing quantity in the negative pressure chamber  176 . Besides, the filter layer  140  is not directly contacted with the powder grain material inside the secondary filter layer  174  by forming the secondary filter layer  174  in the state of being fastened and hardened, and is not blocked as long as air continues to pass through the secondary filter layer  174 . That is, the secondary filter layer  174  is not the layer made by blocking the filter cylinder  162 , but when the powder grain material inside the secondary filter layer  174  is absorbed in the filter layer  140  side, the secondary filter layer  174  fastened and hardened at relatively high density prevents the particle of the powder grain material from reaching the filter layer  140  so as to save blocking the filter cylinder  162  and so as to improve air absorbing efficiency. 
     In this state, the powder grain material P of the inner peripheral side of the filter layer  140  is maintained in the state of being fastened on the inner peripheral portion IP side of the filter layer  140  and in the state of high bulk density by absorbing air so as to stop the outflow on the lower hand. 
     That is, the powder grain material is stopped discharging, and stops further discharging the powder grain material by serving as a valve for stopping the flow of the powder grain material by the powder grain material itself. 
     In order to discharge the powder grain material, the auger  127  is rotated so as to compulsorily discharge the powder grain material filled inside the filter layer  140 . When the rotation of the auger  127  is stopped after a predetermined quantity of the powder grain material drops in the vinyl bag  172 , the powder grain material is not discharged while being absorbed and maintained for the inner periphery side of the filter layer  140 . 
     In order to quickly discharge the powder grain material and correctly discharge it a predetermined quantity in the vinyl bag, almost  90  percent of the predetermined quantity of the powder grain material may be discharged after starting the auger  127  by making its rotation quickly, and then the remaining almost 10 percent may be discharged by slowly rotating. 
     Besides, the powder grain body may be easily discharged in such a manner that the inside of the filter layer  140  is made a predetermined negative pressure when the flow of the powder grain material is stopped and is made atmospheric pressure or negative pressure near to the atmospheric pressure rather than a predetermined negative pressure at the time of stopping the discharge of the powder grain material when the powder grain body is flowed so as to help the discharge by the auger  127 . 
     Such a fear that the powder grain material drops in the vinyl bag  172  in a being hardened state since it is exhausted in a pressed and bulky state by the powder grain material control unit  130  when it drops in the vinyl bag  172  may be entertained. But, the powder grain material equally drops in the vinyl bag without being blown up in a powder state since it is dispersed as an appropriate sized lump by the bars  171  of the powder grain material distributing ring  131  provided with the lower portion of the powder grain material control unit  130 . 
     When the powder grain material drops in the vinyl bag a predetermined quantity, the vinyl bag  172  is closed by a heated bag closing piece  175 , as shown in FIG.  2 . 
     The vinyl bag is formed in such a manner that the intermediate portion of the vinyl cylinder in the shape of a cylinder supplied from the upper hand, enclosing the powder grain material control unit, is closed by the bag closing piece  175 , the vinyl cylinder goes down, being filled with the powder grain material by the powder grain material control unit, and the upper portion rather than the intermediate portion is closed again by the bag closing piece  175 . 
     The filter cylinder  162  can be changed by detaching the screw  154  of the lower flange  144  and pulling the lower flange  144  and the filter layer  140  out of the upper flange  143  and the outside ring  146 . 
     Besides, the choking of the filter may be solved by entering highly pressured air from the suction cap  142 , and its maintenance is easy. 
     Furthermore, the above-mentioned powder grain material filling unit  120  has the drop guide cylinder  125  and the auger  127  having almost the same length as one of this drop guide cylinder  125 . But, as a powder grain material filling unit  220  as shown in FIG. 9, the drop guide cylinder may be omitted, the length of an auger  227  may be made short and a roll of a blade  229  having spiral shape may be formed. 
     Besides, it is not always necessary to enter the lower end of the augers  127 ,  227  of the powder grain material filling units  120 ,  220  in the above-mentioned two embodiments in the powder grain material control unit  130  although in fact, the end is entered in. The length of the augers  127 ,  227  may be the length to almost the upper end of the powder grain material control unit  130 . 
     When it is not necessary to fill with so correct quantity, the augers  127 ,  227  are not always necessary. In this case, in order to stop the discharge of the powder grain material, air is sucked so as to make the inner peripheral side of the filter layer  140  more negative pressure than predetermined, and then, the powder grain material is absorbed in the inner peripheral side of the filter layer  140  so as to prevent the discharge. In order to discharge, the suction of air is stopped so as to return the pressure of the inner peripheral side of the filter layer to an atmospheric pressure, or so as to make the negative pressure to such a degree that the powder grain material discharges. Then, the powder grain material is dropped and discharged by its dead weight. 
     Accordingly, the above-mentioned powder grain material control unit  120  does not stop the discharge of the powder grain material by closely contacting the parts with each other, but by making the inner peripheral side of the filter layer  140  negative pressure. Besides, the powder grain material can be correctly and speedily stopped since the discharge of the powder grain material is stopped by making the inner peripheral side of the filter layer  140  negative pressure and by getting the powder grain material which is stopped to discharge act as a valve to stop the discharge of the powder grain material thereafter without no mechanical operation. 
     The embodiments which are described in the present specification are illustrative and not limiting. The scope of the invention is designated by the accompanying claims and is not restricted by the descriptions of the specific embodiments. Accordingly, all the transformations and changes belonging to the claims are included in the scope of the present invention.