JP2524687B2 - Rotary powder compression molding machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to medicines such as medicines and agricultural chemicals,
The present invention relates to a rotary powder compression molding machine for compressing and molding powder materials in the fields of foods, powder metallurgy, etc., in particular, by improving a weight adjustment trajectory for determining the weight of molded products such as tablets to be molded, The present invention relates to a rotary powder compression molding machine capable of reducing variations in the weight of molded products.

[0002]

2. Description of the Related Art In a rotary powder compression molding machine such as a rotary tableting machine for compressing and molding tablets, filling powder into a die and weighing it (filling a die hole with a predetermined amount) are performed together with a rotary disk. This is done by sliding the moved lower punch on the weight adjusting track.

That is, when the die in which the tip of the lower punch is inserted faces the powder feeder with the rotation of the turntable, the lower punch slides on the lowering device and is pulled down by the lowering device. The powder material in the powder feeder is sucked into and filled. Next, the lower pestle is provided with a slanted orbit portion having a rising slope and a horizontal orbit portion having a weight setting surface that extends horizontally from the upper end of the slant of the rising slope, and the weight is appropriately adjusted to move in the vertical direction. Slide on the adjustment track.

More specifically, the lower punch, which moves horizontally from the lowering device, collides with the ascending slope of the oblique track portion and slides along the slope to ascend, and the powder material in the die hole Surplus is discharged into the powder feeder. After that, the lower punch is slid on the setting surface, whose height position is set by the horizontal weight setting surface. And, since the scraping portion composed of the rear wall of the powder feeder is correspondingly arranged on the weight setting surface, as the lower punch slides on the weight setting surface, the scraping portion causes the upper surface of the die to move. Worn (scraped). Thereby, the filling depth of the powder material into the die hole, in other words, the weight of the molded product is determined.

By the way, if the lower punch moves in the weight adjusting track, especially on the weight setting surface, the behavior of the lower punch during the scraping is not stable, which adversely affects the weighing accuracy of the molded product. Is known.

Therefore, a technique described in Japanese Patent Publication No. 56-21520 is known as a means for solving such a problem. In this technique, a safety track is always urged downward by a coil spring on the weight adjusting track so that it can move up and down, and the pressing part of this track is engaged with the shoulder part of the track contact part of the lower punch from above, The lower punch is pressed against the weight setting surface, so that the lower punch can be prevented from rising from the horizontal weight setting surface.

[0007]

However, the safety track is effective only when the lower pestle slides on the weight setting surface, and when the lower pestle slides on the ascending slope before that. It does not hold down the punch.

By the way, the lower pestle moves horizontally from the lowering device and collides with the ascending slope of the weight adjusting track (this collision point is called the initial moving point, and from this point, the lower pestle follows the ascending slope. Then, the lower punches jump by the reaction, and thereafter, the rising slope may be slid to the upper end side of the slope while repeating the jumping operation that gradually attenuates. This behavior of the lower punch is a phenomenon called tapping. This tapping phenomenon is caused by the lower pestle causing a jumping due to its inertial force even when the lower pestle moves from the ascending slope to the horizontal weight setting plane in the weight adjusting orbit without the safety orbit. Occurs. And, such a tapping phenomenon becomes more remarkable as the rotation speed of the rotating disk increases.

The degree of tapping phenomenon of the lower punch on the weight adjusting orbit depends on the difference in resistance due to physical properties such as the adhered state of the powder material entering between the tip of the lower punch and the die hole, and the lower punch. The difference in resistance with the punch slide hole of the rotary disc that holds this up and down,
Further, due to the difference in resistance between the dust-proof rubber seal for the punch slide hole and the lower punch that penetrates the seal, the lower punch moved by the rotary disk differs.

When such a tapping phenomenon of the lower punch occurs, the density of the powder material taken into the die hole of the die into which the tip portion of the lower punch is inserted is increased depending on the degree of tapping. Therefore, even if the technique described in Japanese Patent Publication No. 56-21520 is adopted and the filling depth is kept constant, there is a problem in that the weight of the molded product varies due to the difference in the filling density among the dies. .

Incidentally, the weight adjustment orbit is determined according to the weight evaluation based on the periodic sampling of the molded product.
If necessary, it is moved up or down to adjust the powder loading in the die, so the position of the initial point of the lower punch with respect to its ascending slope is not constant. Therefore, it is impossible to apply the technique described in Japanese Patent Publication No. 56-21520 to the ascending slope. An object of the present invention is to obtain a rotary powder compression molding machine capable of reducing the weight variation of molded products.

[0012]

According to the present invention, there is provided a slanted raceway portion having an ascending slope on which a raceway contact portion having a circular cross section formed on a lower portion of a steel lower punch which is moved together with a turntable slides. ,
A milling hole of a mortar attached to the turntable by a steel weight adjusting track provided with a horizontal track part that is horizontally continuous from the upper end of the slope of the ascending slope and has a weight setting surface on which the track contact part slides. It is premised on a rotary powder compression molding machine in which the height position of the lower punch inserted into the lower punch is set to determine the filling depth of the powder material into the die.

In order to achieve the above object, the magnetic attraction means for the lower punch is provided in a range of at least the horizontal orbital portion of the weight adjusting orbital portion between the inclined orbital portion side and the inclined orbital portion. It has been installed across.

[0014]

In the present invention, the magnetic attraction means provided on the weight adjusting track attracts the track contact portion of the lower punch which slides on the weight adjusting track by its magnetic force. This magnetic attraction is performed at least in a range extending over the oblique track portion where the tapping phenomenon of the lower punch can occur and the horizontal track portion side of the horizontal track portion. As a result, the lower punch that slides on the weight adjustment track suppresses the tapping phenomenon on the weight adjustment track, and the packing density of the powder material taken into each die hole is different for each die. Prevent.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. 1 shows the structure of a rotary powder compression molding machine such as a rotary tableting machine, reference numeral 1 is a rotary disk, and a plurality of dies 2 are located on the same circle drawn around the center of rotation thereof. Installed at equal intervals.

Reference numeral 3 in FIGS. 1 and 2 denotes a lower punch which is supported by the rotary disc 1 so as to be vertically movable through a lower punch slide hole (not shown) provided in the rotary disc 1 corresponding to each mill 2. The tips of the punches are individually inserted into the die holes of each die 2 to form the bottoms of these die holes. Each lower punch 3 is made of hardened steel.

As shown in FIG. 8, each lower punch 3 is formed by providing a body portion 3c at the upper end of the track contact portion 3a via a neck portion 3b, and a punch tip portion 3d at the upper end of the body portion 3c. ing. The orbital contact portion 3a has a circular cross section in the direction perpendicular to the axis.
The upper end of the contact portion 3a is chamfered diagonally to form a neck portion 3b.
Has a shoulder portion 3a1 (see FIGS. 1 and 2) connected to the lower end thereof, and the lower end peripheral surface 3a2 is rounded and chamfered to connect to the horizontal lower end surface 3a3 of the track contact portion 3a.

Reference numeral 4 in FIG. 1 denotes an upper punch which is supported by the rotary table 1 so as to be able to move up and down through an upper punch slide hole (not shown) provided in the rotary table 1 corresponding to each mill 2. 4 has the same structure as the lower punch 3. The tip of the punch of each upper punch 4 is inserted into and removed from the die hole of the die 2 from above along with the lifting operation. In FIG. 1, 5 is a fixed powder feeder having an open lower surface, and 6 is a scraper, which are provided close to or in contact with the upper surface of the die mounting portion of the rotary disc 1.

In FIG. 1, 7 is a lower punch thrusting track, 8 is a lowering device,
Reference numeral 9 is a weight adjusting orbit that is vertically moved as necessary, 10 is a transfer orbit, and 11 is a lower punch pressure roll, and these lower punches 3 are respectively moved up and down. In FIG. 1, reference numeral 12 is an upper punch guide track, and 13 is an upper punch pressure roll, by which each upper punch 4 is moved up and down. Each of these tracks 7 to 13 is made of hardened steel that is harder than the punches 3 and 4.

Next, a weight adjusting track 9 which is an essential part of the present invention.
The configuration will be described in detail with reference to FIGS.
As shown in FIGS. 4 to 7, the weight adjusting track 9 includes a vertical track base 15 which is mounted on the upper cutout portion 14a of the track support shaft 14 which is lifted and lowered, and which is screwed and welded. An oblique track portion 16 and a horizontal track portion 17 are integrally provided so as to project laterally from the upper part of 15. The weight adjusting track 9 is actually curved along the movement path of the lower punch 3, but is not drawn as such in the figure for easy understanding.

In the weight adjusting track 9, the rear end 17b of the horizontal track part 17 on the transfer track 10 side is located behind the scraping part 5a formed by the rear wall of the powder feeder 5, in other words, the rotation of the turntable 1. Is provided as a reference and is provided on the front side in the rotation direction with respect to the scraping portion 5a.

The oblique track portion 16 is a track contact portion 3a of the lower punch 3.
The lower peripheral surface 3a2 is formed by a sloped portion having a sliding slope 16a that slides, and the horizontal orbit portion 17 is horizontally connected from the upper end of the slope of the rising slope 16a to the lower end surface 3 of the orbital contact portion 3a.
It is formed of a horizontal portion having a weight setting surface 17a on which a3 slides. The weight adjusting track 9 has a slanting track portion 1
6 is a grooved cam-like horizontal lower end portion 8 of the lowering device 8.
a (refer to FIG. 1), in other words, the ascending slope 16a is obliquely intersected with the moving direction of the lower punch 3 and is disposed between the lowering device 8 and the transfer track 10, and the horizontal track portion thereof is provided. Reference numeral 17 extends horizontally toward the transfer track 10.

As shown in FIGS. 3 and 4, the ascending slope 16a is formed such that the center portion in the width direction is low and is formed as a concave curved surface continuous in the moving direction of the lower punch 3, and each concave curved surface is formed. The radius C (see FIG. 7) of the cross section of the lower punch 3 at the position in the same direction as the direction perpendicular to the axis is the dimension r from the center of the track contact portion 3a to the contact point of the contact portion 3a with the rising slope 16a.
(See Fig. 8) or slightly larger. The concave curved surface forming the ascending slope 16a has a cutting edge formed at a portion drawn with the dimension r shown in FIG. 8, that is, a boundary 3a4 between the flat lower end surface 3a3 of the lower punch 3 and the lower end peripheral surface 3a2. The rising slope 16a of the weight adjusting track 9 is formed by cutting with a cutter.

The weight adjusting track 9 is provided with, for example, a large number of magnets 18 as magnetic attraction means. These magnets 18 include a rising slope 16a and a weight setting surface 17
The orbital contact portion 3a of the lower punch 3 is attracted to a by magnetic force,
The lower punch 3 is used to hold the lower punch 3 from being lifted from the surfaces 16a and 17a, and is provided at least in the range between the oblique track portion side of the horizontal track portion 17 and the oblique track portion 16.

In the case of this embodiment, the magnet 18
Are mounted by embedding them in the mounting holes 19 formed at predetermined intervals along the moving direction of the lower punch 3 from the lower surface side over the entire oblique orbit portion 16 and the horizontal orbit portion 17. One of these magnets 18 (indicated by reference numeral 18a as necessary to distinguish it from other magnets) is
As shown in FIG. 5, the oblique track portion 16 and the horizontal track portion 17
It is provided corresponding to the boundary part between and. As each magnet 18, a magnet whose magnetic force reaches several times the weight of the lower punch 3 is adopted.

Each of the magnets 18 has, for example, a cylindrical shape, and both ends of which the magnetic poles are formed are chamfered so that they can be easily pressed into the mounting holes 19. The end surfaces of the magnets 18 on the insertion side are in close contact with the inner surface of the mounting hole 19 corresponding to the magnet shape in order to make it easier to exert magnetism on the rising slope 16a and the weight setting surface 17a. It is preferable that the magnetic poles appearing on the insertion side end faces of the adjacent magnets 18 are the same poles in order to secure a larger magnetic flux with respect to the lower punch 3 (in other words, magnetic attraction force exerted on the lower punch 3). When increasing the magnetic force of each magnet 18 itself, the magnetic poles appearing on the end face of the insertion side may be different poles.

In the rotary tableting machine having the weight adjusting track 9 having the above-mentioned structure, when the lower punch 3 is brought to a position corresponding to the powder feeder 5 by the rotation of the turntable 1, the lower punch 3 is lowered. When passing through the lowering device 8, the lower punch 3 is lowered in accordance with the sliding of the shoulder portion 3a1 of the lower punch 3 to the lowering cam surface 8b (see FIG. 1) of the lowering device 8, so that the powder feeding is performed simultaneously with the lowering. The powder in the container 5 is sucked and filled in the mortar hole of the mortar 2. Next, the lower punch 3 passes through the weight adjusting track 9 and determines the amount of powder to be taken into the die 2.

That is, the weight adjusting orbit 9 provided at the position corresponding to the powder feeder 5 is moved up to the lowering device 8 side to the ascending slope 16a.
Therefore, the sloped surface 16a raises the lower punch 3 to discharge the excess powder in the die 2 into the powder feeder 5, and immediately after that, the scraper 5a of the powder feeder 5 moves the die. The upper surface of 2 is ground. As a result, the powder filling depth A into the die 2 is
(See FIG. 1) is regulated to determine the amount, or weight, of powder to be compressed.

Immediately after this weighing, the upper punch 4 is lowered by the descending slope 12a of the upper punch guide track 12, the tip of the punch is inserted into the powder-filled die 2, and then the upper and lower punches 3,3.
4 passes between the upper and lower pressure rolls 11 and 13. During this passage, the upper and lower punches 3 and 4 are moved so that the tips of the punches approach each other, and the powder in the die 2 is compression-molded. The molding load applied to the lower pestle 3 at the time of molding is detected by a pressure-electric converter such as a load cell, and when the detected value deviates from the set value, an elevating mechanism (not shown) is operated accordingly to support the track. The shaft 14 is raised or lowered. Thereby, the height position of the weight adjusting track 9 is adjusted, and the amount of the powder material taken into the die 2 is adjusted.

After this compression molding, the upper punch 4 is raised by the rising slope 12b of the upper punch guide track 12. A little later than this ascent, the lower punch 3 is raised by the ascending slope 7a of the lower punch thrusting track 7, so that the molded product B such as a tablet is extruded onto the upper surface of the die mounting portion of the rotary disc 1. The extruded molded product B hits the scraper 6, is peeled off from the lower punch 3, and is taken out of the turntable 1 along the scraper 6.

One molding cycle S is completed by a series of operations from the suction of the powder material into the die 2 to the removal of the molded product B from the rotary disk 1 as described above.
Is repeated.

Next, the operation when the lower punch 3 passes through the weight adjusting track 9 for weighing in the molding cycle will be described in detail. As the rotary table 1 rotates, the lower pestle 3 moves horizontally through the horizontal end portion 8a of the lowering device 8 and toward the rising slope 16a of the weight adjusting track 9 facing the lower pestle 3. The boundary 3a4 between the lower end peripheral surface 3a2 and the lower end surface 3a3 of the orbital contact portion 3a collides with the ascending slope 16a. Therefore, due to the reaction of this collision, the lower punch 16a may jump up from the collision point (initial movement point) as a starting point to start the tapping operation.

However, a plurality of magnets 18 are embedded in the slanting track portion 16 having the rising slope 16a,
Since these magnetic forces reach the ascending slope 16a, the orbital contact portion 3a of the lower punch 3 is attracted to the ascending slope 16a by the magnetic attraction force. As a result, the jumping of the lower punch 3 at the initial movement point can be suppressed to a small level, or the jumping can be eliminated to prevent the tapping phenomenon of the lower punch 3 on the ascending slope 16a.

Further, when the lower punch 3 goes up the ascending slope 16a, it may jump up from the upper end of the slope of the ascending slope 16a due to its inertia, and on the basis of this, it may try to start the tapping operation on the horizontal weight setting surface 17a. However, since the magnet 18a is embedded in the boundary portion between the slanted orbit portion 16 and the horizontal orbit portion 17, the magnetic sticking force suppresses the lower punch 3 from jumping up from the inclined upper end, and the horizontal orbit. By the magnetic attraction force of the other magnet 18 embedded in the portion 17, the orbital contact portion 3 of the lower punch 3
a is sucked onto the horizontal weight setting surface 17a. Thereby, the tapping phenomenon of the lower punch 3 on the weight setting surface 17a can also be prevented.

As described above, the tapping phenomenon of the lower punch 3 on the ascending slope 16a and the weight setting surface 17a is prevented by the magnetic attraction force of each magnet 18, so that the powder material taken into the die 2 die hole is formed. It is possible to prevent the packing density of V from changing. Therefore, the weighing accuracy of the powder material on the weight adjusting track 9 is improved, and the weight variation of the molded product B can be reduced.

Moreover, the ascending slope 16a of this embodiment is a concave curved surface which is low in the widthwise central portion of the weight adjusting track 9 and which is continuous in the longitudinal direction of the track 9, and the axis of the lower punch 3 at this concave curved surface. The radius in the same direction as the right angle is the orbital contact portion 3a.
Since the radius r of the boundary 3a4 is substantially equal to the radius r of the boundary 3a4, the collision at the initial movement point is not concentrated at one point but is performed with line contact. Of course, following this collision, the lower punch 3 is pushed up by the ascending slope 16a while maintaining the line contact.

In this way, the lower punch 3 is attached to the ascending slope 16a.
Since the orbital contact portion 3a of the magnet comes into line contact, the magnet 1
8 has a large effect of sucking the lower punch 3 to the ascending slope 16a, and therefore has a large effect of preventing the tapping phenomenon of the lower punch 3 on the ascending slope 16a described above.

By the line contact, the ascending slope 16a
The impact force at the initial moving point of the lower punch 3 against the ascending slope 16a
Can be dispersed in a wide range, for example, in the entire width direction.
Therefore, the ascending slope 16a can be less likely to be gouged from the initial moving point of the lower punch 3 during long-term use, and it is not necessary to embed the super steel that reinforces the ascending slope 16a. Steel weight adjustment track 9
Can improve the service life of.

Further, in the case of this embodiment, the magnet 18 is not limited to the entire area of the slanted track portion 16 but the horizontal track portion 1.
Even when the scraping portion 5a of the powder feeder 5 scrapes the powder on the upper surface of the die 2, the lower blade 3 is sucked onto the weight setting surface 17a by the magnetic attraction force of the magnet 18 even when it is scraped off on the upper surface of the die 2. Can hold

Therefore, the behavior of the lower punch 3 at the time of scraping is stable, so that the weighing accuracy of the molded product B can be improved. Since the weighing accuracy can be improved in this way, in this embodiment, in order to stabilize the behavior of the lower punch 3 on the weight setting surface 17a, the lower punch 3 is moved to the weight setting surface 17a by the force of the spring. The structure corresponding to the safety track to be pressed can be eliminated. Therefore, the structure around the weight adjusting track can be simplified and the assembling thereof can be facilitated.

However, in the present invention, the horizontal track portion 1
It is not indispensable to provide the magnets 18 over the entire area of 7, so that, for example, the horizontal orbit portion 17 is not provided with magnets other than the oblique orbit portion side,
Therefore, when the magnetic attraction force to the lower punch 3 by the magnet is weak or weak at the time of the scraping, it is safe to press the lower punch 3 against the weight setting surface 17a by the force of the spring at the time of the scraping. A track may be provided. Further, in order to more reliably obtain the improvement of the weighing accuracy, even when the magnet 18 is provided over the entire area of the horizontal track portion 17 as in the present embodiment, the magnet 18 is not removed during the scraping. A safety track for pressing the punch 3 against the weight setting surface 17a by the force of the spring may be provided.

9 and 10 show the essential parts of the second embodiment of the present invention. The second embodiment is different from the first embodiment only in the structure of the magnet of the weight adjusting track, and the other structures are shown in FIGS. 1 to 8 including parts not shown in FIGS. 9 and 10. Since it has the same structure as the rotary tableting machine of the first embodiment, the structure not shown is substituted by FIGS. 1 to 8, and the same components as shown are designated by the same reference numerals as those of the first embodiment. Although the description of those configurations and the description of the functions and effects based thereon will be omitted, these same portions also form a part of the configuration of the apparatus of this embodiment.

The magnet 28 as the magnetic attraction means
The weight adjusting track 29 has a thick plate shape following the oblique track section 16 and the horizontal track section 17, and is magnetized in the thickness direction. The magnet 28 has its magnetic pole surface closely attached to the lower surfaces of the slanted track portion 16 and the horizontal track portion 17, and is attached by adhesion, screwing, or the like. In addition,
The configuration other than this point is the same as that of the first embodiment.

Also in the structure of the second embodiment, the magnet 28 is provided on the weight adjusting track 29, and the lower punch 3 sliding on the ascending slope 16a and the weight setting surface 17a by the magnetic force thereof is attached to these surfaces 16a, Since it can be sucked onto 17a, the same effect as in the first embodiment can be obtained and the intended purpose of the present invention can be achieved. Moreover, since only one magnet 28 is required in the second embodiment, there is an effect that it is possible to easily attach the magnet 28 to the weight adjusting track 29. In the second embodiment, the magnet 28 may be attached only within the range between the oblique track portion 16 of the horizontal track portion 17 and the oblique track portion 16.

11 and 12 show the essential parts of a third embodiment of the present invention. The third embodiment differs from the first embodiment only in the structure of the magnet of the weight adjusting track.
Other configurations are the same as those of the rotary tabletting machine of the first embodiment shown in FIGS. 1 to 8 including the portions not shown in FIGS. 11 and 12, and therefore the configurations not shown in FIG. 8 is used as a substitute, the same components as those shown in the drawings are designated by the same reference numerals as those in the first embodiment, and a description of those components and a description of their function and effect based thereon will be omitted. The parts also form part of the configuration of the apparatus of this embodiment. The structure other than this point is the same as that of the first embodiment.

In the third embodiment, the magnet serving as the magnetic attraction means is also used as the slanted track portion 36 and the horizontal track portion 37 in the weight adjusting track 39. That is, the slanted orbital portion 36 and the horizontal orbital portion 37 are magnetized as a whole by being magnetized in the thickness direction. These track portions 36 and 37 correspond to the oblique track portion and the horizontal track portion of the first embodiment. In the third embodiment, the magnetization may be performed only within the horizontal orbital portion 37 on the side of the orbital orbital portion and the area of the orbital orbital portion 36.

Also in the structure of the third embodiment, the magnetic force of the slanted track portion 36 forming the magnet of the weight adjusting track 39 and the horizontal track portion 17 slides on the ascending slope 16a and the weight setting surface 17a. Lower punch 3 with these faces 1
Since it can be sucked onto 6a and 17a, the same effect as the first embodiment can be obtained, and the intended purpose of the present invention can be achieved. Moreover, in this third embodiment, the oblique track portion 3
Since 6 and the horizontal orbit portion 37 also serve as a magnet,
The number of parts of the weight adjusting track 39 is the minimum, and there is an effect that the structure can be simplified.

13 to 15 show the essential parts of the fourth embodiment of the present invention. The fourth embodiment is different from the first embodiment only in the structure of the orbital contact portion of the lower pestle, and the other structures are shown in FIGS. 1 to 1 including parts not shown in FIGS.
Since the rotary tablet press of the first embodiment shown in FIG. 8 has the same configuration, the configuration not shown is substituted by FIGS. 1 to 8, and the same components shown in FIG. Although the same reference numerals are given and the description of the configuration and the description of the action and effect based thereon are omitted, these same portions also form a part of the configuration of the apparatus of the present embodiment.

In the fourth embodiment, the auxiliary magnet 41 exposed at the lower end surface 3a3 is embedded in the orbital contact portion 3a of each lower punch 3. The magnetic pole exposed on the lower end surface 3a3 of the magnet 41 has a polarity different from the polarities of the rising slope 16a and the weight setting surface 17a of the weight adjusting track 9. The polarities of the rising slope 16a and the weight setting surface 17a provided by the magnet 18 are the same. The structure other than this point is the same as that of the first embodiment.

Also in the structure of the fourth embodiment, by providing the magnet 18 on the weight adjusting track 9, the same effect as that of the first embodiment can be obtained, and the intended object of the present invention can be achieved. . Moreover, since the auxiliary magnet 41 is attached to the lower punch 3, the magnetic attraction between the lower punch 3 and the rising slope 16a and the weight setting surface 17a can be further increased. In addition, the lower punch 3 sliding on it can be more surely sucked.

[0051]

As described above in detail, according to the rotary powder compression molding machine of the present invention, the magnetic attraction means for attracting the track contact portion of the lower punch which slides on the weight adjusting track to the weight adjusting track by magnetic force. Is provided at least in a range where the tapping phenomenon of the lower punch can occur to suppress the lower punch from causing the tapping phenomenon on the weight adjusting track, and the packing density of the powder material taken into each die hole changes. Since this is prevented, the weighing accuracy of the powder material is improved and the weight variation of the molded product can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a rotary tableting machine according to a first embodiment of the present invention, which is developed along a movement path of a punch.

FIG. 2 is a partial cross-sectional view showing the structure around a weight adjusting track of the rotary tableting machine according to the first embodiment.

FIG. 3 is a perspective view showing a configuration of a weight adjusting track of the rotary tableting machine according to the first embodiment.

FIG. 4 is a front view showing a configuration of a weight adjusting track according to the first embodiment.

FIG. 5 is a cross-sectional view of the weight adjusting track taken along line ZZ in FIG.

FIG. 6 is a cross-sectional view of the weight adjusting track taken along the line YY in FIG.

FIG. 7 is a cross-sectional view of the weight adjusting track taken along line XX in FIG.

FIG. 8 is a perspective view showing a configuration of a lower punch of the rotary tableting machine according to the first embodiment.

FIG. 9 is a perspective view showing a configuration of a weight adjusting track of a rotary tableting machine according to a second embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a configuration of a weight adjusting track according to the second embodiment.

FIG. 11 is a perspective view showing a configuration of a weight adjusting track of a rotary tableting machine according to a third embodiment of the present invention.

FIG. 12 is a sectional view showing the structure of a weight adjusting track according to the third embodiment.

FIG. 13 is a partial cross-sectional view showing the structure around a weight adjusting track of a rotary tableting machine according to the fourth embodiment.

FIG. 14 is a cross-sectional view of the weight adjusting track taken along line WW in FIG.

FIG. 15 is a perspective view showing a configuration of a lower punch of the rotary tableting machine according to the fourth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotating disk, 2 ... Mortar, 3 ... Lower punch, 3a ... Orbital contact part of lower punch, 9, 29, 39 ... Weight adjustment track, 16 ... Oblique track part, 16a ... Ascending slope, 17 ... Horizontal track part , 17a ... Weight setting surface, 18, 28 ... Magnet (magnetic attracting means), 36 ... Oblique orbital portion (magnetic attracting means) also serving as magnet, 37 ... Horizontal orbital portion (magnetic attracting means) also serving as magnet.

Claims (1)

(57) [Claims] 1. A slanted raceway portion having a slanting slope on which a raceway contact portion having a circular cross section formed on the lower part of a steel lower punch moved together with a rotating disk slides; With a steel weight adjusting track having a horizontal track part having a weight setting surface in which the track contact part slides horizontally and slides,
A rotary powder in which the height position of the lower punch inserted from below into the die hole of the die attached to the rotating plate is set so that the filling depth of the powder material into the die is determined. In the compression molding machine, the magnetic attraction means for the lower punch is provided over at least the range of the slanted track portion side and the slanted track portion of the horizontal track portion in the weight adjusting track. A rotary powder compression molding machine.