A rotary powder compression molding machine configured to compression-mold powder filled in a die bore of a die mounted on a turret between a lower end face of an upper punch and an upper end face of a lower punch, is provided including powder lubricant jet means for jetting powder lubricant, the po
A rotary powder compression molding machine configured to compression-mold powder filled in a die bore of a die mounted on a turret between a lower end face of an upper punch and an upper end face of a lower punch, is provided including powder lubricant jet means for jetting powder lubricant, the powder lubricant jet means including: jet nozzles, each of which has a concave surface, faces a respective one of end faces of the upper and lower punches at a respective powder lubricant jet position, and is configured to guide the powder lubricant along the concave surface and jet the powder lubricant in substantially one direction; an air stream providing mechanism configured to jet an air stream to adjacent the lower end face of the upper punch for preventing the powder lubricant jetted from the jet nozzles from scattering upwardly; and a charger device configured to charge the powder lubricant electrostatically upon jetting from the jet nozzles.
대표청구항▼
The invention claimed is: 1. A rotary powder compression molding machine, comprising: a turret which is rotatably mounted in a frame via a vertical shaft; dies, each having a die bore, which are mounted on the turret; an upper punch and a lower punch which are vertically slidably held above and bel
The invention claimed is: 1. A rotary powder compression molding machine, comprising: a turret which is rotatably mounted in a frame via a vertical shaft; dies, each having a die bore, which are mounted on the turret; an upper punch and a lower punch which are vertically slidably held above and below each of the dies, tips of the upper and lower punches being insertable in the die bore, the upper and lower punches being pressable and movable toward each other to compression-mold powder filled in the die bore between a lower end face of the upper punch and an upper end face of the lower punch, and powder lubricant jet means for jetting powder lubricant against the end faces of respective of the upper and lower punches and against the die bore prior to filling of the powder into the die bore, the powder lubricant jet means including a first jet nozzle configured to jet the powder lubricant placed at a powder lubricant jet position substantially toward the end face of the upper punch; a second jet nozzle configured to jet the powder lubricant placed at a powder lubricant jet position substantially toward the end face of the lower punch; and a charger device including first and second electrodes for producing first and second electric fields, respectively, through which the powder lubricant to be jetted from the first jet nozzle and the powder lubricant to be jetted from the second jet nozzle pass respectively, the charger device being capable of rendering the powder lubricant to be jetted against each of the lower punch and the die different from the powder lubricant to be jetted against the upper punch in electrostatically charged condition, wherein the charger device comprises first voltage application means for applying a first voltage to the first electrode, and second voltage application means for applying a second voltage to the second electrode, the second voltage being higher than the first voltage. 2. The rotary powder compression molding machine according to claim 1, further comprising a powder lubricant jet device configured to pressure-feed the powder lubricant to the powder lubricant jet means, wherein the powder lubricant jet device and the powder lubricant jet means being in communication with each other via a feed pipeline from which influence of static electricity is eliminated. 3. The rotary powder compression molding machine according to claim 2, wherein the feed pipeline comprises an inner pipe formed from an insulating material for allowing the powder lubricant to pass therethrough, and an electrically conductive member for inhibiting the inner pipe from being electrostatically charged, the electrically conductive member being grounded. 4. The rotary powder compression molding machine according to claim 1, which is provided with an air delivery hole for feeding a destaticizing air flow to the upper surface of the turret to destaticize residual powder lubricant on the upper surface of the die, and a suction hole for sucking in the residual powder lubricant destaticized. 5. The rotary powder compression molding machine according to claim 1, further comprising an air stream providing mechanism configured to jet air to adjacent the lower end face of the upper punch for preventing the powder lubricant jetted from the first jet nozzle from scattering upwardly, wherein the powder lubricant jet means further comprises a powder sucking mechanism configured to suck in the powder lubricant that is prevented from moving upwardly by the air stream providing mechanism. 6. A rotary powder compression molding machine, comprising: a turret which is rotatably mounted in a frame via a vertical shaft; dies, each having a die bore, which are mounted on the turret; an upper punch and a lower punch which are vertically slidably held above and below each of the dies, tips of the upper and lower punches being insertable in the die bore, the upper and lower punches being pressable and movable toward each other to compression-mold powder filled in the die bore between a lower end face of the upper punch and an upper end face of the lower punch, and powder lubricant jet means for jetting powder lubricant against the end faces of respective of the upper and lower punches and against the die bore prior to filling of the powder into the die bore, the powder lubricant jet means including a first jet nozzle configured to jet the powder lubricant placed at a powder lubricant jet position substantially toward the end face of the upper punch; a second jet nozzle configured to jet the powder lubricant placed at a powder lubricant jet position substantially toward the end face of the lower punch; and a charger device including first and second electrodes for producing first and second electric fields, respectively, through which the powder lubricant to be jetted from the first jet nozzle and the powder lubricant to be jetted from the second jet nozzle pass respectively, the charger device being capable of rendering the powder lubricant to be jetted against each of the lower punch and the die different from the powder lubricant to be jetted against the upper punch in electrostatically charged condition, wherein the charger device comprises first voltage application means for applying a first voltage to the first electrode, and second voltage application means for applying a second voltage to the second electrode, the second voltage being higher than the first voltage, and wherein the first and second jet nozzles each have a concave surface facing the end face of a respective one of the punches for guiding the powder lubricant before jetting, the concave surface of the first jet nozzle defining a space for the first electric field to be produced therein, the concave surface of the second jet nozzle defining a space for the second electric field to be produced therein. 7. The rotary powder compression molding machine according to claim 6, further comprising a powder lubricant jet device configured to pressure-feed the powder lubricant to the powder lubricant jet means, wherein the powder lubricant jet device and the powder lubricant jet means being in communication with each other via a feed pipeline from which influence of static electricity is eliminated. 8. The rotary powder compression molding machine according to claim 6, which is provided with an air delivery hole for feeding a destaticizing air flow to the upper surface of the turret to destaticize residual powder lubricant on the upper surface of the die, and a suction hole for sucking in the residual powder lubricant destaticized. 9. The rotary powder compression molding machine according to claim 8, wherein the powder lubricant jet means further comprises a box member enclosing the powder lubricant jet position, wherein: the concave surfaces of respective of the first and second jet nozzles are located within the box member; and the powder sucking mechanism sucks in an excess of the powder lubricant scattering from the box member through the box member in cooperation with the air stream provided by the air stream providing mechanism. 10. The rotary powder compression molding machine according to claim 6, further comprising an air stream providing mechanism configured to jet air to adjacent the lower end face of the upper punch for preventing the powder lubricant jetted from the first jet nozzle from scattering upwardly, wherein the powder lubricant jet means further comprises a powder sucking mechanism configured to suck in the powder lubricant that is prevented from moving upwardly by the air stream providing mechanism. 11. The rotary powder compression molding machine according to claim 6, wherein the concave surface of each of the jet nozzles is shaped into a three-dimensional curved surface. 12. The rotary powder compression molding machine according to claim 10, wherein the powder lubricant jet means further comprises a box member enclosing the powder lubricant jet position, wherein: the concave surfaces of respective of the first and second jet nozzles are located within the box member; and the powder sucking mechanism sucks in an excess of the powder lubricant scattering from the box member through the box member in cooperation with the air stream provided by the air stream providing mechanism.
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이 특허에 인용된 특허 (3)
Schmitz Guido,DEX ; Schmitz Hans-Dieter,DEX ; Kurka Peter,DEX ; Maasz Joachim, Device for the controlled spraying of pulverulent lubricants onto punches and dies of tableting presses.
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