JPH11207500A - Rotary type powder compression molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a rotary type powder compression molding machine capable of performing original function of a track arranged before a roll notwithstanding a packing depth and preventing galling or damage of the track and a lower pestle. SOLUTION: This rotary type powder compression molding machine is provided with a means for detecting a compression molding load on a pestle 69, when a mortar 65 mounted on a rotary table 61 passes through a space between rolls 34, 44 for pressing upper and lower pestles, based on the detected information, a weight regulating track 71 is moved up and down by a weight regulating track ascending/descending part 75 and for changing packing depth of a powdery material in the mortar, and a track 72 arranged before a roll with an upward slope toward a lower pestle pressing roll 34 is arranged so as to interpose between the track 71 and the roll 34. The track 72 arranged before the roll is provided so as to be ascendable/descendable independently of the weight regulating track 71. According to a set height of the track 71 based on the ascending/descending of the track 71, an ascending/descending part 76 to ascend/ descend the track 72 arranged before the roll in parallel at a prescribed ratio is provided, which is linked to the ascending/descending part 75.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type in which a powder material weighed and filled in a die mounted on a turntable is compressed by an upper punch and a lower punch in the die to form a tablet or the like. The present invention relates to a rotary powder compression molding machine such as a tableting machine.

[0002]

2. Description of the Related Art In a rotary tableting machine having no roll front track on the front side of a lower punch press roll, when the lower punch passes through a weight adjustment track and reaches the lower punch press roll, a lower punch is used. Reaches the lower punch pressure roll without changing its height position while sliding on the weight adjustment track, and is raised according to the compression amount of the powder material in the die from the time of contact with this roll. . Due to the relationship between the amount of powder material sucked into the mortar (filling depth) and the amount of compression, and the amount of the upper punch entering the mortar during pressurization, the lower punch is more likely to be in contact with the upper punch pressure roll. It also reaches the lower punch compression roll sooner. As described above, when the lower punch directly reaches the lower punch pressure roll, the deeper the filling depth, the more the lower punch reaches the lower punch pressure roll (referred to as the initial movement point) and the center of the lower punch pressure roll. Since a sharp contact angle sandwiched between the passing vertical lines is large, the collision sound is loud, and an unnecessary lateral force is applied to the lower punch and the lower punch pressure roll.

Therefore, in order to improve such a point, as shown in FIGS. 10 (A) and 11 (A) to 11 (C), a roll front trajectory having a rising gradient toward the lower punch pressure roll 1. 2. Description of the Related Art There is known a rotary tableting machine which is provided so as to extend over a weight adjusting track 3 and a lower punch pressure roll 1. The pre-roll trajectory 2 is a rear end of the weight adjustment trajectory 3 (in other words,
The end of the lower punch that passes through the weight adjustment track 3 is connected to the lower end via a pivot 4 that extends in the radial direction of the turntable so as to be rotatable in the vertical direction. The end on the side of the pressure roll 1 is supported in the form of being deposited on the peripheral surface of the lower punch pressure roll 1 as shown in FIG. The pre-roll trajectory 2 has a circular arc shape in plan view along the movement locus of a lower punch (not shown) (see the dashed line C in FIG. 10).

The weight adjusting track 3 is moved up and down by, for example, feedback control means (not shown). In other words, this means detects the compression molding load applied to the lower punch and the like when the mill attached to the turntable passes between the upper and lower punch press rolls, and adjusts the weight if necessary based on the detected information. By operating the track elevating unit, the weight adjusting track 3 is moved up and down to change the height position of the lower punch with respect to the mill, thereby changing the filling depth of the powder material into the mill. By this automatic control, the weight of a tablet or the like to be compression-molded can be maintained at a predetermined value.

[0005] As described above, the roll front track 2 has its free end deposited on the peripheral surface of the lower punch press roll 1 and the other end pivotally supported by the weight adjustment track 3 via the pivot 4. Therefore, as the height position of the weight adjustment track 3, that is, the filling depth of the powder material into the die becomes deeper, the inclination is steeper. By the way, FIG. 11A shows a state where the filling depth is shallow,
FIG. 11 (C) shows a state where the filling depth is the maximum, FIG. 11 (B) shows a state where the filling depth is intermediate, and n in these figures denotes powder in the die by the lower punch pressing roll 1. Material compression, m
Indicates the amount of compression of the powder material in the die according to the inclination of the pre-roll track 2.

By providing the front roll 2 directly connected to the weight adjusting track 3 as described above, regardless of the filling depth, as shown in FIGS.
Can be set to substantially the same small angle, whereby the problem of the rotary tableting machine without the above-described pre-roll track 2 can be improved.

[0007]

However, in the conventional construction, since the inclination of the front roll 2 becomes steeper as the filling depth becomes deeper, the lower punch is gradually raised from the weight adjusting track 3 to lower the lower punch. It becomes difficult to deliver the pressure roll 1 without difficulty. In addition, as the inclination of the pre-roll track 2 becomes steeper as described above, the amount of pushing up the lower punch in the process of sliding on the track 2 and reaching the initial movement point of the lower punch pressure roll 1 increases. As a result, the amount of pressurization and compression of the powder material filled in the die becomes large. For this reason, the lower punch and the pre-roll track 2 may compete and bite, and in particular, the pre-roll track 2
May be sometimes broken when made of synthetic resin.
Further, as described above, the fact that the contact angle θ is substantially the same means that the lower punch hits the peripheral surface of the lower punch pressure roll 1, that is,
Since there is no change in the initial movement point, FIG.
When the filling depth of the powder material into the die is shallow as in (A), there is a problem that the original function of the pre-roll track 2 cannot be sufficiently exhibited.

In addition, as described above, the inclination of the front roll 2 is changed along with the weight adjustment track 3 so that the top surface of the free end side of the front roll 2 becomes closer to the width direction of the track 2. Easy to tilt. For example, if the track upper surface 2a of the free end is kept horizontal as shown in FIG. 10C in the state of FIG. 11B, the filling depth is shallow in FIG.
In the state of FIG. 11A, the upper surface 2a of the track is inclined so as to fall outward in the radial direction of the turntable as shown in FIG. 10B, and when the state of FIG. 2
As shown in FIG. 10 (D), a is tilted inward toward the center of the turntable. Since the height of the lower punch sliding on the track upper surface 2a increases due to such inclination,
The above-described galling and damage to the pre-roll track 2 are more likely to occur.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rotary powder compression molding machine capable of exhibiting the original function of the track before the roll regardless of the filling depth and preventing galling and damage of the track and the lower punch. Is to get

[0010]

According to the present invention, a height position of a lower punch with respect to a die attached to a turntable can be adjusted via a weight adjusting track which is raised and lowered by a weight adjusting track raising / lowering section, Means for changing the filling depth of the powder material into the die by raising and lowering the weight adjusting track, and the roll front track having a rising gradient toward the lower punch pressure roll, It is assumed that a rotary powder compression molding machine is provided to extend over the track and the lower punch pressure roll.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the roll front trajectory is provided so as to be able to ascend and descend independently of the weight adjustment trajectory, and the weight adjustment based on the elevation of the weight adjustment trajectory. The apparatus is characterized in that the apparatus further comprises a pre-roll track elevating unit that moves the pre-roll track in parallel at a predetermined ratio according to the set height of the track.

In the first aspect of the present invention, the pre-roll trajectory moves up and down independently of the weight adjustment trajectory by the pre-roll trajectory elevating unit, and the elevating unit moves the set height of the weight adjustment trajectory, in other words, The trajectory before the roll is translated in proportion to the filling depth of the powder material into the mortar, and the trajectory is raised and lowered.

Therefore, the lower the filling depth, the higher the position of the pre-roll trajectory, and conversely, the higher the filling depth, the lower the position of the pre-roll trajectory. The position of the initial movement point of the lower punch to the lower punch pressure roll reaching the lower punch pressure roll can be set to an appropriate height position corresponding to the filling depth.

By moving the pre-roll trajectory in parallel as described above, especially when the filling depth is deep, the amount of rise of the lower punch by the pre-roll trajectory can be reduced by the conventional method of tilting the pre-roll trajectory. In comparison, the amount of pressurization and compression of the powder material in the die due to the passage of the lower punch through the pre-roll track can be reduced. In addition, since the orbit before the roll moves in parallel, the upper surface does not tilt in the width direction.

Further, since the track before the roll moves up and down in parallel, the transfer condition of the lower punch from the weight adjustment track onto this track is always the same, and therefore, regardless of the filling depth, the lower punch is moved from the weight adjustment track to the lower punch. Can be gradually and smoothly raised to reach the lower punch pressure roll without difficulty.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic explanatory view showing, in an expanded manner, the relationship between a rotary plate, on which a die of a rotary tableting machine for producing tablets is mounted, a punch, and a punch-up / down cam means as an example of a rotary powder compression molding machine. 2 is a longitudinal sectional view schematically showing a configuration of a main part of the rotary tableting machine. The fixed main body frame indicated by the reference numeral 21 in these figures includes a lower frame 22, an upper frame 23 disposed above the lower frame 22,
There are four (only two shown) frame columns 24 connecting the four corners of the upper and lower frames 22, 23, respectively.

The lower frame 22 has a concave partition 25 protruding from the upper surface inside the lower frame 22, and an output chamber 26 is provided inside the partition 25. The output chamber 26 is the lower frame 22
It is open to the upper surface of the central part of. The output chamber 2 is provided in the partition 25.
A worm shaft 27 that passes through the shaft 6 in the horizontal direction is rotatably supported via a bearing (not shown), and a worm 28 located in the output chamber 26 is provided at an intermediate portion of the shaft 27.

A horizontal power transmission shaft 52 is connected to the worm shaft 27 via an electromagnetic clutch 51. The power transmission shaft 52 supported by a bearing (not shown) is a worm shaft 2
A V-belt wheel 55 is attached to the shaft 52 as an input rotating body, for example. The V-belt wheel 55 is provided with a rotation power (not shown) generated by a driving device 56 having an electric main motor 57 capable of normal and reverse rotation.
It is supplied via a transmission means such as a belt. Drive 56
Is built in the lower frame 22 and its main motor 5
7 is a general-purpose motor or a servomotor. The power transmission from the driving device 56 to the power transmission shaft 52 may use a gear train instead of the belt transmission means.

At the center of the lower frame 22, a substantially cylindrical support 33 protruding above the frame 22 is provided.
The lower end is inserted into the output chamber 26 and bolted. Further, on the lower frame 22, various lower punch cam means and lower punch pressing rolls 3 are located around the support body 33.
4 are arranged. As the lower punch cam means, FIG.
1, a weight adjusting track 71, a roll front track 72, a push-up track 73, and the like are used as shown in FIG.

As shown in FIG. 1, the lowering unit 35 is arranged below a powder supply unit 85 which will be described later, which is arranged at the powder supply position. This lowering device 35 is provided with a lower punch 6 described later.
9 has an upper downward slope 35a on which the upper inclined surface slides, and a lower downward slope 35b on which the lower inclined surface of the lower punch slides, whereby the lower punch is lowered. The weight adjusting track 71, which will be described in detail later, is arranged at a position adjacent to the outlet side of the lowering unit 35 and below the powder feeder 85 described later, that is, at a weighing position. The track 71 is moved up and down in parallel by a weight adjusting track raising / lowering unit 75 described later to appropriately change the height position of the lower punch with respect to the mill described later, and to fill the powder filling volume in the mill, in other words, charge the powder material. It is provided to adjust the depth and keep the weight of the molded product (tablet) constant. The push-up track 73 arranged at the tablet take-out position adjacent to the outlet side of the weight adjusting track 71 has a push-up slope 73a for pushing out the tablet, which has been compression-molded in the mill, onto the mill, and this slope 73a.
And a horizontal surface 73b connected to the upper end of the inclined surface. The lowering device 35 is arranged so as to be continuous with the exit side of the horizontal surface 73b. The pre-roll track 72 is disposed so as to extend over the rear part of the weight adjustment track 71 (in other words, the exit side portion of the lower punch passing through the track 71) and the lower punch pressure roll 34 as described later.

The lower punch pressure roll 34 is rotatably provided at a compression molding position. In FIG. 2, reference numeral 36 denotes a lower punch pressure roll 3
Pressing force adjusting means 37 for adjusting the height position of 4 is a cam holder for supporting the lower punch cam means. In FIG. 1, reference numeral 74 denotes a pressing force sensor such as a load cell for converting a compression molding load applied to the lower punch into an electric signal and extracting the compression molding force as a compression molding force. It is attached to a holder 45.

A main shaft 38 is disposed in the support body 33 so as to penetrate the support body 33 in the axial direction. The main shaft 38 is formed by a bearing 39 provided on the partition wall 25 and a pair of upper and lower bearings 40 provided inside the support body 33. It is rotatably supported. A worm gear 41 housed in the output chamber 26 is attached to the main shaft 38, and the gear 41 is meshed with the worm 28. The worm 28, the worm gear 41, the power transmission shaft 52, and the belt transmission means include a driving device 56
And a transmission path from the shaft to the main shaft 38, and the electromagnetic clutch 51 is provided on this transmission path.

Therefore, when the electromagnetic clutch 51 connects the worm shaft 27 and the power transmission shaft 52, the V-belt wheel 5
The worm shaft 27 and the worm 28 are rotated by the power of the driving device 56 supplied to the motor 5, and the worm gear 41 is rotated at a reduced speed, so that the main shaft 38 is rotated together with the gear 41.

An upper punch press roll 44 is mounted on the upper frame 23 at a position corresponding to the lower punch press roll 34. An upper cam 42 as a cam means for an upper punch is bolted to the lower surface of the upper frame 23. The planar shape of the upper cam 42 is circular, and has a cam portion 43 that is continuous over the entire outer circumference and moves up and down an upper punch described later. The cam portion 43 has an ascending region, a descending region, and the like (not shown). As shown in FIG.
The upper end of the main shaft 38 is inserted into the center of the shaft 2, and a plurality of bearings 49 for rotatably supporting the main shaft 38 are built therein.

A rotary disk 61 which is rotated together with the main shaft 38 is bolted to the main shaft 38 between the upper and lower frames 22, 23. The turntable 61 has a die mounting portion 62 at an axially intermediate portion thereof, and an upper punch mounting portion 63 facing the upper surface thereof.
And a lower punch mounting portion 64 facing the lower surface of the die mounting portion 62.
And are provided integrally. Each of these mounting portions 62-6
Each of the reference numerals 4 extends outside the turntable 61 and is provided continuously in the circumferential direction of the turntable 61.

A plurality of dies 65 are attached to the mortar mounting portion 62 by the main shaft 3.
It is mounted on the same circle drawn around 8,
These dies 65 are provided at predetermined intervals on the same circle. A plurality of upper punch holder holes 66 penetrating the upper punch mounting portion 63 are provided corresponding to the respective dies 65. Each upper punch holder hole 66 has an upper punch 6
7 are provided so as to be slidable in the up-down direction, respectively, and their punch tips are inserted into and removed from the die 65 from above. The lower punch mounting portion 64 is provided with a plurality of lower punch holder holes 68 penetrating therethrough, corresponding to the respective dies 65. A lower punch 69 penetrates through each lower punch holder hole 68 so as to be slidable in the vertical direction, and the tip of the punch is held in a state of being inserted into the die 65.

Each of the upper punches 67 is provided integrally with a head 67a in the form of an abacus ball having a diameter larger than that of the cylindrical portion at the upper end of a cylindrical portion penetrating the upper punch holder hole 66, and has a smaller diameter at the lower end than the cylindrical portion. The punch tip 67b is integrally provided. These upper punches 67
Is moved up and down by sliding the lower inclined surface 67a1 of the head portion 67a to the cam portion 43, whereby the head 67a is inserted into and removed from the die 65 from above. Similarly, the lower punch 69 is provided integrally with a head 69a having an abacus ball shape larger in diameter than the cylindrical portion at the lower end of a cylindrical portion penetrating the lower punch holder hole 68, and a punch smaller in diameter than the cylindrical portion at the upper end. The tip 69b is provided integrally. These lower punches 69 are provided by inserting the tip portions 69b thereof into the dies 65 from below, and contact the upper inclined surface 69a1 or the lower inclined surface 69a2 of the head 69a with each of the lower punch cam means. As a result, it can be raised and lowered.

The powder feeder 8 is located at the powder feed position.
5 is arranged so that the lower surface opening thereof is slightly in contact with the upper surface of the die attaching portion 62. The end wall of this supply device 85 (rotary disk 6
The wall 85a located on the front side in the rotation direction 1 is used as powder scraping means. The powder feeder 85 is appropriately supplied with powder material via a raw material hopper 86 shown in FIG. Also, FIG.
The center 87 is a scraper provided so as to be slightly in contact with the upper surface of the die mounting portion 62, and the tablet A molded using the scraper as a guide is taken out of the turntable 61.

The weight orbit adjusting orbit 71 and the orbit 7
The configuration of the weight adjusting track raising / lowering unit 75 for raising / lowering the unit 1 will be described with reference to FIGS. The weight adjustment track 71 having an arcuate planar shape is bolted on a horizontal track base plate 91. As shown in FIG. 4, the weight adjusting track 71 has an upward slope 71 a facing the outlet end of the lowering device 35 and raising the lower punch 69, and the slope 71 a.
a horizontal filling depth setting surface 71b connected to the inclined state of a,
It has a horizontal lead-out surface 71c that is slightly lower than the setting surface 71b and is continuous. The filling depth setting surface 71b is
The powder supply device 85 is disposed below the end wall 85a so as to scrape off excess powder, which will be described later. The rear portion 71E of the weight adjustment track 71 having the lead-out surface 71c, that is, the exit side portion of the lower punch 69 is formed thinner than the front portion of the track 71 on the side of the lowering unit 35 as shown in FIGS. The end of this roll 34 is fixed so that it does not interfere with the lower punch pressure roll 34 regardless of the elevation of the track 71.
Have been close to.

The track base plate 91 is bolted to the upper end of a track support shaft 92 that can move up and down. Track support shaft 92
Is a component of the weight adjusting track elevating unit 75, and has a driven slope 92a at its lower end as shown in FIG.

The weight adjusting track elevating section 75 includes an elevating section frame 94, which has a vertical support shaft guide section 95 and a horizontal slider guide section which is connected to the lower end of the guide section 95 at right angles. 96 are provided. The cylindrical hollow portion 95a of the support shaft guide 95 is opened at the upper end of the mechanism frame 94, and the track support shaft 92 is inserted through this opening so as to be vertically movable.

One end of the cylindrical hollow portion 96a of the slider guide 96 is connected to the lower end of the cylindrical hollow portion 95a. A slider 98 is provided in the hollow portion 96a.
Are movably accommodated in the axial direction. A portion of the slider 98 on the side of the support shaft guide 95 has a cam surface 98a formed of a slope and forms a wedge shape. The cam surface 98a receives the driven slope 92a to support the track support shaft 92. The distal end of a stopper screw 100 screwed to the slider guide 96 is inserted into a long groove 99 formed in the peripheral surface of the slider 98 so as to extend in the axial direction.
Slider 98 while allowing axial movement of slider 98
Is stopped. The slider 98 has a slider driving shaft 10 from the side opposite to the side where the cam surface 98a is provided.
One screw portion 101a is screwed. In FIG. 5, reference numeral 98c denotes a hollow portion in which the screw portion 101a of the slider shaft 101 is housed.

The entrance of the slider guide portion 96 has a hole 96 having a diameter larger than that of the portion in which the slider 98 is accommodated.
b, a pair of bearings 102 are accommodated in this portion. These bearings 102 have a slider drive shaft 1
01 is supported therethrough. 103 is the bearing 1
02 is a motor bracket that also serves as a stopper. A driven spur gear 104 is connected to a shaft portion of the slider drive shaft 101 protruding outside the slider guide 96, and a drive sprocket wheel 97, for example, is connected as a rotary output body.

The lifting / lowering unit frame 94 is supported by a motor bracket 103 and can be rotated forward and backward.
05 is built-in. The output shaft 10 of the motor 105
A drive spur gear 106 is connected to 5a.
Is connected to the driven spur gear 104 via an intermediate gear 107. The lifting unit frame 94 has a built-in potentiometer 108. The meter 108 is provided for detecting the vertical dimension of the weight adjustment track 71, and is connected to the driven spur gear 104 via a reduction mechanism 110 having an intermediate gear 109 and a worm gear.

The above components other than the sprocket wheel 97 constitute a weight adjusting orbit elevating unit 75. In this mechanism 75, when the lifting / lowering motor 105 is rotated forward, the slider drive shaft 101 is rotated via the gear trains 106, 107 and 104, and the slider 98 screwed to the threaded portion 101a of the shaft 101. Is moved in the direction of arrow A in FIG. 5, so that the cam surface 98a of the slider 98 pushes up the track support shaft 92. As a result, the track base plate 91 is raised together with the track support shaft 92, and at the same time, the weight adjustment track 71 is translated and moved up. Conversely, when the lifting / lowering motor 105 rotates in the reverse direction, the slider 98 moves in the direction of arrow B in FIG. 5, so that the track support shaft 92 is lowered with the track base plate 91, and at the same time, the weight adjusting track 71 is translated and lowered. The vertical dimension at this time is detected by the potentiometer 108, and the detection information is supplied to a control unit described later. The lifting motor 105 is connected to the pressing force sensor 7.
4 is rotated forward or backward by an appropriate amount in response to a control signal appropriately given from a control unit described below based on the compression molding load detected by the compression molding load. In order to keep the height of the punch 69, in other words, the weight of the molded tablet constant,
The filling depth of the powder material into the material is changed. Therefore, feedback control for adjusting the height position of the weight adjustment trajectory 71 is performed by the weight adjustment trajectory elevating unit 75, the pressure sensor 74, and the control unit 88 including the microcomputer shown in FIG.

Next, the configuration of the pre-roll track 72 and the pre-roll track elevating portion 76 for raising and lowering the track 72 proportionally according to the lifting and lowering of the weight adjustment track 71 will be described with reference to FIGS.
This will be described with reference to FIG.

As shown in FIG. 3, the pre-roll track 72 having a substantially arc shape in plan view has no connection with the weight control track 71, and the thickness of the weight control track 71 is independent of the track 71. Are provided side by side so as to face and be parallel to the side surface of the thin rear portion 71E. In addition, the rear end of the pre-roll track 72 (that is, the exit end of the lower punch 69) is close to the lower punch pressure roll 34 so as not to interfere with the lower punch pressure roll 34 regardless of the elevation of the track 72. The upper surface 72a of the roll front track 72 is formed as an inclined surface having a rising gradient toward the lower punch pressure roll 34. Orbit 72
The lower punch pressure roll 34 side is always positioned higher than the lead-out surface 71c, and the upwardly inclined upper surface 72a
The head 69a of the lower punch 69 moves from the upper surface of the weight adjustment track 71 and slides.

A horizontal track base plate 121 is disposed below the pre-roll track 72, and a vertical plate-like support portion 122 is projected from the base plate 121. The support 122 is connected to the pre-roll track 72 via a horizontal pivot 123.
Is rotatably supported in a cantilever manner. Track base plate 121
A spring 124 is interposed between the roller and the roll front track 72 on the lower punch pressure roll 34 side. This spring 124
Urges the pre-roll trajectory 72 in the counterclockwise direction in FIG. A stopper 125 composed of a bolt, a nut, and the like is attached to an end of the track base plate 121 on the lowering device 35 side. The height of the stopper 125 can be adjusted in the vertical direction, and the upper end supports the end of the front track 72 on the lowering unit 35 side from below. With this support,
The upper surface of the end on the side of the lowering unit 35 is normally held lower than the outlet surface 71c.

As shown in FIG. 6, the track base plate 121
Is bolted on a base support shaft 126 that can move up and down. The orbit support shaft 126 is provided with a pre-roll orbit elevating unit 76.
And has a driven slope 126a at the lower end thereof.

The frame of the pre-roll track elevating unit 76 is shared by the elevating unit frame 94. This frame 9
4 is provided with a vertical support shaft guide portion 127 and a horizontal slider guide portion 128 connected to the lower end of the guide portion 127 at right angles. Support shaft guide 127
Has an opening at the upper end of the mechanism frame 94, through which the track support shaft 126 is inserted so as to be vertically movable.

One end of the cylindrical hollow portion 128a of the slider guide portion 128 communicates with the lower end of the cylindrical hollow portion 127a. A slider 129 is accommodated in the hollow portion 128a so as to be movable in the axial direction. A portion of the slider 129 on the side of the support shaft guide portion 127 has a cam surface 129a formed of a slope and forms a wedge shape. The cam surface 129a receives the driven slope 126a to support the track support shaft 126. A long groove 130 formed in the circumferential surface of the slider 129 so as to extend in the axial direction is provided with a stopper screw 131 screwed to the slider guide 128.
Is inserted, whereby the slider 129 is prevented from rotating while allowing the slider 129 to move in the axial direction. The screw portion 1 of the slider drive shaft 132 is provided on the slider 129 from the side opposite to the side where the cam surface 129a is provided.
32a is screwed. In FIG. 6, reference numeral 129c denotes a hollow portion in which the screw portion 132a of the slider shaft 132 is accommodated.

The entrance of the slider guide portion 128 is a hole portion 128b having a larger diameter than the portion in which the slider 129 is accommodated, and a pair of bearings 133 is formed in this portion.
Is housed. A slider drive shaft 132 penetrates and is supported by these bearings 133. For example, a driven sprocket wheel 134 is connected to the shaft portion of the slider drive shaft 132 protruding outside the slider guide 128 as a rotary input member.

The above-described parts other than the sprocket wheel 134 constitute the pre-roll track elevating unit 76. In this mechanism 76, when the slider drive shaft 132 is rotated via an interlocking mechanism described later, the slider 129 screwed to the screw portion 132a of the shaft 132 is moved in the direction of arrow A in FIG. This slider 12
The 9 cam surface 129a pushes up the track support shaft 126. As a result, the track base plate 121 is raised together with the track support shaft 126, so that the pre-roll track 72 is simultaneously raised in parallel. When the slider drive shaft 132 is rotated in the opposite direction to the above case, the slider 129 is moved in the direction of arrow B in FIG. 6, so that the track support shaft 126 is lowered with the track base plate 121, At the same time, the orbit 72 before the roll
Is translated and lowered.

The driven-side sprocket wheel 134 has the same diameter as the driving-side sprocket wheel 97, and a chain 135 connecting these two sprocket wheels 97 and 134 is wound therearound. The sprocket wheels 97 and 134 and the chain 135 form an interlocking mechanism 136 that interlocks the pre-roll track elevating section 76 with the weight adjustment track section 75. Not limited to such a chain transmission structure, the interlocking mechanism 136 may be formed by a belt transmission structure having a timing belt and a timing pulley, a gear train, or the like. By this mechanism 136, the roll front trajectory 72 is raised and lowered in conjunction with the lifting and lowering of the weight adjustment trajectory 71. The thread pitch of the thread portion 132a of the slider drive shaft 132 in the pre-roll track elevating section 76 is, for example, 1 / th of the thread pitch of the thread section 101a of the slider drive shaft 101 of the weight adjusting track elevating section 75.
It is set to 3 so that the pre-roll trajectory 72 is raised and lowered at a ratio of about 1/3 with respect to the lifting and lowering of the weight adjustment trajectory 71. The setting of this ratio depends on the compression ratio in powder compression molding of tablets being about 1/3. Therefore, when a molded product other than a tablet is compression molded, the thread pitch is set so as to conform to the compression ratio of the molded product.

Incidentally, reference numeral 141 in FIGS. 5, 8 and 9
Indicates a punch-up prevention device. This device 141
Can be provided at a portion that moves horizontally after the punch is raised or lowered, such as a portion that extends from the raised or lowered region of the cam portion 43 to the horizontal position, such as the weight adjustment track 72, the push-up track 73, and the like. The device 141 for preventing the lower punch 69 from being lifted up provided on the weight adjustment track 72 will be described as a representative.

As shown in detail in FIGS. 8 and 9, the apparatus 141 includes a plurality of, for example, two support columns 142,
One holding track 143 supported between the upper ends of the pillars 142 is provided. Each support pillar 142 has a screw shaft 142a protruding from its lower end detachably screwed onto the track base plate 91, and is attached at a predetermined interval along the rotation direction of the turntable 61. The holding track 143 is made of a thin flat plate having a circular arc shape when viewed from above.
Bolt 1 removably screwed onto the upper surface of support column 142
It is fixed via 44. This holding track 143
After quenching steel made of a single thin plate having a uniform thickness at each part, a tapered surface is machined from the lower surface side to the inner side edge, and the tapered surface is formed on the upper part of the head 69a of the lower punch 69. By contacting the inclined surface 69a1 (the lower inclined surface 67a1 of the punch 67 in the case of preventing the upper punch 67 from jumping), the upper punch 69 is prevented from jumping upward. The holding track 143 is not limited to a thin plate, and may be a thick plate having a uniform thickness for forming a tapered surface after quenching.

The device provided with the punch pop-up preventing device 141 is excellent in the following points. Since the support pillar 142 and the holding track 143 can be cut very easily and accurately by a laser cutter or the like, the processing cost can be reduced. On the other hand, the conventional punch jumping prevention device adopts a holding track composed of an integrated product made by cutting a lump of hardened steel with a special dedicated cutter having the same shape as the head of the punch. Therefore, there is a problem that the processing is troublesome and time-consuming, and the processing cost increases.

In addition, although the plate-shaped holding track 143 is arc-shaped and long, the thickness of each part is equal.
The quenching distortion is extremely small, and therefore, there is little possibility that the holding track 143 competes with the head 69a of the lower punch 69 or the like to cause burning. On the other hand, in the conventional structure, since the thickness of each part is thick and non-uniform, the distortion accompanying the quenching applied to the entire integrated product is large. It is difficult to manage the gap between the portion 69a and the like, and there is a high possibility that competition will occur and burning will occur.

For this reason, in the past, in assembling a tableting machine, it was necessary to cut the punch contact surface of the quenched orbit in the assembling of the tableting machine, and the adjustment work was extremely troublesome. However, in the case of the device 141, the support shaft 142 can be easily adjusted so as not to compete with the punch by cutting or replacing the support shaft 142 to an appropriate height,
When the support shaft 142 is left as it is, the holding track 1
It can be dealt with only by cutting the tapered surface of 43, and in this case, the area to be cut is extremely small, so that the work can be easily performed even if quenching is performed. Therefore, it is possible to easily perform the adjustment work for allowing the punches to pass without competing.

Further, as described above, the holding track 143
Is made of a thin flat plate, even if a part of the tapered surface may partially compete with the punch, the holding track 1
Reference numeral 43 denotes a competing portion that can be easily elastically deformed and escaped, and the competing portion wears out relatively early and becomes familiar with the head of the punch. Also, bolt 14
In the case where the through hole 145 through which the through hole 4 passes is not a perfect circle as shown in FIG.
43 can be easily adjusted by moving the punch in the front radial direction so that the punch and the tapered surface do not compete with each other. If the adjustment range is exceeded, or the adjustment by the movement in the radial direction or the polishing of the tapered surface is not performed, or the wear of the holding track 143 becomes significant, the support pillar 142 is left as it is and the holding track 143 is left. Can be replaced with a new one, so that not only the adjustment but also the maintenance work can be performed easily and at low cost. Of course, such points cannot be obtained with the conventional configuration.

The operation of the rotary tableting machine having the above configuration is as follows.
When the electromagnetic clutch 51 is in the “on” state, the driving device 56
Is started by operating the main motor 57 of FIG. Then, the power of the roll driving device 56 transmitted to the V-belt wheel 55 is supplied to the worm shaft 27 from the power transmission shaft 52 via the electromagnetic clutch 51, and thus the main shaft 38 and the worm gear 41 are meshed with each other via the engagement between the worm 28 and the worm gear 41. The power of the driving device 56 is transmitted to the rotating disk 61 integrally connected thereto. The tablet is manufactured by starting the rotation of the turntable 61 in this manner.

That is, when the mortise 65 is carried to the powder supply position, the powder in the powder supply device 85 is sucked and filled into the mortise 65 as the lower punch 69 is lowered by the lowering device 35. . Subsequently, as the lower punch 69 conveyed to the weighing position slides up the slope 71 a of the weight adjustment track 71 and rises, excess powder in the die 65 is discharged into the powder supply device 85 and returned. , A predetermined amount of powder is left in the mortar 65. Immediately after this, the lower punch 69 moves to the filling depth setting surface 71 of the track 71.
b, the upper surface of the die 65 is moved out of the powder supply device 85 after sliding on the lower end of the terminal wall 85a of the powder supply device 85.
The scraping is performed at a, and the amount of the powder charged into the mortar 65 is determined.

Next, when the mill 65 is carried to the compression molding position after the above weighing, the upper punch 67 and the lower punch 69 are moved in the direction approaching each other by the upper and lower punch pressing rollers 44 and 34, and the inside of the mill 65 is moved. Compression molding of the powder material. After this, the mortar 6
5 is carried to the thrust position, so first, the upper punch 67
The upper cam 42 is lifted by the rising area in the cam portion 43 and is pulled out of the die 65. Next, as the lower punch 69 is raised by the push-up track 73, the molded product (tablet) A in the die 65 is pushed out onto the die 65. Finally, when the mill 65 is carried to the take-out position, the extruded molded product A hits the scraper 87, is separated from the lower punch 69, and is taken out of the turntable 61.

As described above, each time the mill 65 is rotated by the turntable 61, one molding cycle is completed. Hereinafter, this molding cycle is repeated, and tablets A are manufactured one after another.

At the time of such manufacturing, the control unit 88 composed of a microcomputer or the like appropriately drives the elevating motor 105 based on the compression molding load (detection information) detected by the pressing force sensor 74, and The tablet A having a predetermined weight is manufactured by raising or lowering the 71 and performing the above-described feedback control for changing the filling depth of the powder material into the mortar 65 by the raising and lowering.

In the feedback control, the weight adjusting track elevating section 75 is operated, and the pre-roll track elevating section 76 is connected to the elevating section 75 via the interlocking mechanism 136.
Are linked to each other, and by the above-described operation of the lifting / lowering unit 76, the roll front trajectory 72 is moved up and down by parallel movement at a ratio of about 1/3 with respect to the lifting / lowering of the weight adjustment trajectory 71.

Therefore, as the filling depth of the powder material into the mortar 65 is smaller, the roll front trajectory 75 can be arranged at a higher position as shown in FIG. 7 (A). As the filling depth of the material is deeper, the pre-roll track 75 can be arranged at a lower position as shown in FIG. 7 (C), and in the case of an intermediate filling depth between them, it is shown in FIG. 7 (B). The pre-roll trajectory 75 can be arranged at an intermediate height position so as to achieve the same.
In FIG. 7, n represents the amount of compression of the powder material in the mortar by the lower punch press roll 34, m represents the amount of compression of the powder material in the mortar according to the inclination of the front track 72, and θ1 to θ3 represent respectively. Shows the contact angle.

The vertical movement of the pre-roll track 72 causes the lower punch 69 to slide on the upper surface 72a of the track 72 and reach the lower punch roll 34, so that the lower punch 69 initially moves to the lower punch pressure roll 34. The points h1, h2, h3 (see FIG. 7) can be set at appropriate height positions corresponding to the filling depth of the powder material into the die 65, in other words, the compression ratio of the tablet to be manufactured. Accordingly, the lower punch 69 is guided by the upper surface 72a of the roll front track 72, and the lower punch 69 is gradually and smoothly lifted from the weight adjustment track 71 to reach the lower punch pressing roll 34 without difficulty. be able to.

Further, since the roll front trajectory 72 is moved up and down in parallel with the lifting and lowering of the weight adjusting trajectory 71 as described above, especially when the filling depth of the powder material into the die 65 is deep, As shown in FIG. 7 (C), the amount of rise (in other words, the amount of compression m) of the lower punch 69 by the roll front orbit 72 is compared with the conventional method in which the free end of the lower punch 69 is inclined by leaving the free end thereof. Accordingly, the amount of pressing and compressing of the powder material in the die 65 due to the passage of the lower punch 69 through the pre-roll track 72 can be reduced. Therefore,
Since the reaction force received by the roll front track 72 due to the pressurization and compression is small, the lower punch 69 can prevent the track 34 from galling, and even if the roll front track 72 is not limited to steel but is made of synthetic resin. Damage such as deformation or breakage can be prevented.

Further, as described above, in conjunction with the lifting and lowering of the weight adjusting track 71, the front roll 72 moves up and down while maintaining a parallel posture, so that the upper surface 72a does not tilt in the width direction. Therefore, the height of the lower punch 69 that slides on the upper surface 72a does not increase, so that the risk of galling and damage to the pre-roll track 72 can be further reduced.

In addition, since the pre-roll track 72 moves up and down in parallel as described above, the condition for transferring the lower punch 69 from the weight adjustment track 72 to the upper surface 72a of the track 72 is always set at any filling depth. You can do the same. Therefore, regardless of the filling depth, the lower punch 69 can be gradually and smoothly raised from the weight adjustment track 71 to reach the lower punch pressing roll 34 without difficulty.

In the present embodiment, the pre-roll trajectory 72
Are supported by a pivot 123 and urged by a spring 124 from below. Therefore, in a proper operation state of the tableting machine, since the force of the spring 124 exceeds the above-mentioned reaction force, the orbit before roll 72 is not normally rotated carelessly. However, for some reason, if the powder material is overfilled in the die 65 and the reaction force overcomes the disturbing force of the spring 124, the pre-roll trajectory 72 moves clockwise in FIG. It is turned. Therefore, lower punch 6
9 can reach the lower punch pressure roll 34 through the pre-roll track 72 without excessively competing with the pre-roll track 72, thereby protecting the tableting machine and the pre-roll track 72 and the like. be able to.

The present invention is not limited to the first embodiment. For example, a dedicated electric motor for raising and lowering the roll front trajectory 72 is provided to raise and lower the roll front trajectory 72 at a predetermined ratio with respect to the lifting and lowering of the weight adjustment track 71. The pre-roll trajectory 72 may be moved up and down by controlling the amount of rotation by the control unit based on the detection information of the potentiometer 108. Further, in the present invention, the weight adjustment track 7 is used.
The means for raising and lowering 1 to change the filling depth of the powder material into the mortar 65 is not limited to the feedback control means, but may be other suitable automatic control means. Means for operating the elevating unit 75 may be used.

The present invention is not limited to a rotary powder compression molding machine having only one set of upper and lower punch press rolls, but also includes upper and lower punch press rolls for preliminary compression and upper and lower punch presses for main compression. The present invention can be applied to a rotary powder compression molding machine equipped with a roll, and in the application to the latter molding machine, a roll front orbit is provided at least in front of a lower punch pressurizing roll for full compression, and this orbit is defined as What is necessary is just to carry out in such a way that it is moved in parallel by proportionally moving in parallel with the lifting and lowering of the weight adjustment track. Further, the present invention is not limited to the rotary tablet press, but can be applied to other rotary powder compression molding machines in general.

[0065]

The present invention is embodied in the form described in detail above and has the following effects. Claim 1
According to the invention of the above, at a predetermined ratio according to the filling depth of the powder material into the mortar, the pre-roll trajectory is moved up and down while being translated independently of the weight adjustment trajectory by the pre-roll trajectory elevating unit, and The position of the initial movement point of the lower punch on the pressure roll can be set to an appropriate height position corresponding to the filling depth, and the lower punch can be transferred from the weight adjustment track on the track before the roll to the track before the roll. Since the conditions can always be the same, the original function of the pre-roll trajectory to gradually and smoothly raise the lower punch from the weight adjustment track and reach the lower punch pressure roll without difficulty, regardless of the filling depth, obtain. Furthermore, the upper surface of the parallel roll front track does not tilt in the width direction irrespective of the filling depth, and in particular, even when the filling depth is deep, the amount of elevation of the lower punch due to this roll front track is small. The amount of pressure and compression of the powder material in the die as a result of the lower punch being suppressed by passing the lower punch on the front track of the roll can be reduced, so that galling and damage of the front track of the roll and the lower punch can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing, in a developed manner, the relationship between a rotary plate on which a die of a rotary tableting machine according to a first embodiment of the present invention is mounted, a punch, and a punch-up / down cam device.

FIG. 2 is a longitudinal sectional view showing the configuration of the rotary tableting machine according to the first embodiment.

FIG. 3 is a plan view showing a configuration around the orbit before the roll of the rotary tableting machine according to the first embodiment.

FIG. 4 is a front view showing a configuration around the orbit before the roll of the rotary tableting machine according to the first embodiment in a developed and partially cutaway view.

FIG. 5 is a sectional view taken along the line ZZ in FIG. 4;

FIG. 6 is a sectional view taken along the line YY in FIG. 4;

FIG. 7A shows the relationship between a weight adjustment track, a roll front track, and a lower punch pressure roll in the rotary tableting machine according to the first embodiment when the filling depth is shallow. FIG. (B)
In the rotary tableting machine according to the first embodiment, the weight adjustment trajectory in the state where the filling depth is intermediate, the trajectory before the roll,
The figure which shows the relationship with a lower punch pressure roll. (C) is a diagram showing the relationship between the weight adjustment trajectory, the roll front trajectory, and the lower punch pressure roll in the rotary tableting machine according to the first embodiment when the filling depth is deep.

FIG. 8 is a sectional view showing a configuration around a lower punch jumping prevention device in the rotary tableting machine according to the first embodiment.

FIG. 9 is an exploded perspective view showing a configuration of the lower punch jump prevention device shown in FIG. 8;

FIG. 10A is a plan view showing a configuration around a roll before orbit of a rotary tableting machine according to a conventional example. 10B is a cross-sectional view of the pre-roll trajectory taken along line XX in FIG. 10A in a state where the filling depth is shallow. FIG. 11C is a cross-sectional view of the pre-roll trajectory shown along line XX in FIG. 10A when the filling depth is intermediate. FIG. 1D shows a state where the filling depth is deep.
Sectional drawing of the track before a roll shown along XX in 0 (A).

FIG. 11A is a diagram showing a relationship between a weight adjustment track, a roll front track, and a lower punch pressure roll in a state where the filling depth is shallow in a rotary tableting machine according to a conventional example. (B) is a diagram showing the relationship between the weight adjustment trajectory, the roll front trajectory, and the lower punch pressure roll when the filling depth is intermediate in the rotary tableting machine according to the conventional example. (C) is a diagram showing a relationship between a weight adjustment trajectory, a roll front trajectory, and a lower punch pressure roll in a state where the filling depth is deep in the rotary tableting machine according to the conventional example.

[Explanation of symbols]

 Reference numeral 34 denotes a lower punch press roll, 44 denotes an upper punch press roll, 61 denotes a rotary plate, 65 denotes a die, 69 denotes a lower punch 71, a weight adjustment track, 72, a roll front track, and 72a: an upper surface of the roll front track, 75. ... weight adjusting track elevating section, 76 ... rolling track elevating section, 97 ... drive side sprocket wheel (interlocking mechanism), 134 ... driven side sprocket wheel (interlocking mechanism), 135 ... chain (interlocking mechanism), h1-h3 ... initial movement point.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Motoji Korenaga 20 Nishi Shichijo Nakuracho, Shimogyo-ku, Kyoto City, Kyoto Prefecture

Claims (1)

[Claims] 1. The height position of a lower punch with respect to a die attached to a rotary disk can be adjusted via a weight adjustment track which is raised and lowered by a weight adjustment track raising / lowering unit, and the weight adjustment track is raised and lowered. Means for changing the filling depth of the powder material into the mortar, and a roll front trajectory having an upward slope toward the lower punch press roll, the weight adjustment track and the lower punch press roll In the rotary powder compression molding machine provided so as to extend, the roll front trajectory is provided so as to be able to ascend and descend independently of the weight adjustment trajectory, and the set height of the weight adjustment trajectory based on the elevation of the weight adjustment trajectory A rotary powder compression molding machine comprising: a front-roll trajectory elevating unit for raising and lowering the front-roll trajectory in parallel at a predetermined ratio according to the following conditions.