EP3517289B1 - Adjustable preliminary pressure rail for rotary press with integrated measurement of the preliminary pressure force - Google Patents

Description

The invention relates to a rotary press for the production of single or multi-layer tablets comprising at least one filling device for filling a press material into openings of a die plate, at least one filling station, at least one metering station for the lower punches, at least one printing station and at least one ejection station with tablet scraper and Tablet discharge chute, the at least one pressure station each comprising an upper and a lower pressure roller and an upper and a lower curve sequence, the curve sequences interacting with upper and lower punches. In a further aspect, the invention relates to the use of the rotary press.

State of the art

It is known that rotary presses are used for the production of pharmaceutical tablets or chemical, technical or industrial pellets in large numbers from, in particular, powdered raw materials. Rotary presses usually have a rotor with a circular base area, which has an upper and a lower punch guide, as well as a die plate arranged in between. This die plate has openings or die bores into which the material to be pressed is filled in a filling station by means of a filling device. The material filled into the die bores is dosed by means of a dosing station. For the purposes of this invention, dosing means that excess press material is pushed back into the filling device by lifting the lower punch.

The upper and lower punches are moved axially on the rotor circumference by means of stationary control cams, which are located above and below the rotor and are attached to the respective stationary cam carriers. Head-guided or roller-guided punch shafts are used in rotary presses. The upper punch guide of the rotor is formed by axial bores in the upper part of the rotor for the upper punch shafts. The lower punch guide is analogous to axial Bores formed in the lower part of the rotor for the lower punch shafts. These axial bores are aligned with the die bores of the die plate so that the upper punches and the lower punches can move within the die bore during the filling and pressing process.

The pressing of the pellets takes place in a pressing station of the rotary press. As the rotor of the rotary press rotates, one upper and one lower punch pair are pulled one after the other through two pressure rollers that are arranged one above the other in a pressure roller station. Such a pressure roller station is for example in the DE 197 05 092 C1 described. A pressing station is firmly anchored on the carrier plate of a rotary press and has an upper and a lower pressure roller, the pressure rollers being fastened to the guide column of the pressing station by means of bearing blocks and being arranged so as to be adjustable to one another. By positioning the pressure rollers in relation to one another, the upper and lower punches are moved towards each other, whereby a pressing force is exerted on the pressing material between the punches within the die. By the action of the pressing force on the pressing material, a pressed part is produced from the powdery pressing material.

The creation of a compact is based on a compression process in which the pressing tools move towards one another within the die bore, with any air between the powder particles being pressed out of the pressing material located between the pressing surfaces of the punches. The compaction leads to an essentially complete removal of air-filled spaces between the powder particles. Due to the lack of these interspaces, the pressed particles are in contact with one another, as a result of which, due to the transfer of the pressing force to the pressed particles, interlocking and connection of the particles is achieved. A pressed part is obtained which has a defined hardness. If there is only one press station in a rotary press, it is called the main press station. The corresponding compaction process is called main compaction.

A disadvantage of these rotary presses with only one press station described in the prior art is that often when only one main press station is present poor ventilation of the press material is achieved. This effect applies to both powdery pressed material for pharmaceutical pressed parts and particularly voluminous pressed materials or those pressed materials which have a high fine powder content. Inadequate ventilation leads to incomplete compaction and compacts with uneven or insufficient hardness. In addition, such compacts tend to crack and cap.

Inadequate ventilation can be counteracted by equipping the rotary press with a second press station. This second press station is referred to as the pre-pressure station and is primarily used to remove the air trapped in the press material prior to the main compression from the press material. This makes it possible to no longer use the pressure hold time when passing the main pressure rollers for venting the press material, but almost exclusively for the final compression. The pressure holding time is thus essentially completely available for the action of the pressing force on the pressing material for the production and compression of the pressed part. In this way it is possible to obtain hard tablets even at the highest rotor speeds and with demanding press materials.

As an alternative to using pre-printing stations with an upper and a lower pre-pressure roller, it is possible to use pre-printing stations which consist of an upper and a lower pre-printing rail. These pre-pressure rails are located on the left in front of the upper and lower pressure rollers. The terms “left” and “right” relate to the spatial directions that result when the curve sequence is viewed from the outside, as it appears to an outside observer of a rotary press. In addition, the curve assignment depends on the direction of rotation of the rotor of a rotary press. As an example, a rotary press is described in this application, the rotor of which runs counterclockwise, that is, to the left.

In the upper curve sequence, the pre-pressure rails are integrated into a pull-down curve to the left of the upper pressure roller, which then merges into the elevator curve to the right of the pressure roller, which raises the upper punch again via the filling device. in the For the purposes of this invention, pull-down curves are those components of a curve sequence, along which the upper punches move downwards during the pressing process, while the winding curve controls the upward movement of the upper punches after the pressing process.

In rotary presses previously described in the prior art, the upper ram pull-down cam to the left of the upper pressure roller and the upper ram elevator cam to the right of the upper pressure roller are individually fixed to the cam carrier of the upper cam sequence. From the highest point of the upper punch curve, the shafts of the upper punch are taken over by the pull-down curve and pulled down towards the bottom dead center of the upper pressure roller. The curve itself has a stroke of approx. 25 mm to the top edge of the die. The upper punch is actively immersed in the die by the set immersion depth of the upper pressure roller. Since the immersion depth of the upper punch can usually vary between 2 and 10 mm, the heads of the upper punch run at different heights against the upper pressure roller. With increasing depth of immersion of the upper punch, this leads to a more unfavorable approach angle, which increases wear on the tool and the upper pressure roller, as well as the noise level and the vibrations in the rotary tablet press.

Up to an immersion depth of the upper punch of 2 to 10 mm, an adjustment path can be implemented using an upper punch pull-down and winding curve and in coordination with the adjustment option of the upper pressure roller. A disadvantage of the rotary presses described in the prior art, however, is that no technically satisfactory solutions are described for immersion depths of the upper punches above 10 mm. However, there are applications in which an immersion depth of the upper punch of up to 10 mm is not sufficient to produce different types of compacts. These applications relate in particular to the production of very tall single-layer pellets and the production of multilayer tablets.

In order to produce multilayer tablets, a first pressing material is first filled into the bores of the die plate by means of a filling device within a filling station. To do this, the lower punches of the rotary press are made stationary with the help of a attached filling curve pulled down to a defined filling depth. This creates a space that is closed in three spatial directions for filling in the pressed material. The underside of this closed space forms the pressing surface of the lower punch. This is followed by the cylindrical die bore that forms the outer wall of the press chamber. The press material can be filled in through the open top of the press chamber by means of the filling device located above the die plate. The depth of the press chamber can be controlled by using different filling curves that are interchangeable.

At the beginning of the filling process, the lower punches move flush with the upper edge of the die on the pitch circle of the die into the filling chamber of the filling device filled with press material and are continuously pulled downwards by the filling curve until a predefined maximum filling position is reached. Since press material is on the die plate during the entire downward movement of the lower punch, the press material is sucked into the die hole during the downward movement of the lower punch, whereby a uniform, homogeneous filling of the die bore is achieved. A pressing space is advantageously formed by the walls of the die bore and the top of the lower punch. This pressing space is open at the top, the material to be pressed being filled in via this opening as described.

The length of the filling curve corresponds approximately to half the length of the filling opening of the filling device. Conventional rotary presses work on the principle of excess dosing, which means that the filling curve is used to fill more press material into the die than is required for the finished tablet. The average specialist speaks of a gross filling. The pressing material is usually filled at least to the middle of the filling device. The dosing unit for the lower punch is now connected to the filling curve. With the dosing unit, the lower punches can be raised manually or automatically by 0 to 10 mm compared to the deepest filling position, which results in a net filling. The excess press material is pushed back into the right side of the filling device and can be used again.

After completion of the first filling process, i.e. the filling of the first pressing material, the upper and lower punches are fed to a pressing station. In the pressing station, the upper punches, which are controlled by the upper punch pull-down cam, dip into the die bore and move the pressed material of the first powder layer down towards the lower punch. The depth of immersion of the upper punch is also influenced by the setting of the position of the upper pressure roller. At the lowest point where the uppermost stamp is immersed, a free space is created above the first layer of pressed material, which corresponds to the volume of the gross filling of the second or next layer. The corresponding curves and rails are also lowered until the lower pressure roller is reached. The upper and lower pressure rollers are in a very special position to each other in the pressure station. Due to the position of the upper pressure roller, the upper punches are immersed in the die in such a way that after the upper punch has been lifted in the die, a free space remains above the first layer that corresponds to the gross volume of the second layer. Due to the position of the lower pressure roller, the lower punches are positioned in such a way that, in conjunction with the immersion depth of the upper punches, the first layer of the pressed material is gently pressed on.

After the pressing material of the first layer has been pressed on, the upper punches are lifted by the lift curve over the second filling device. In addition, after pressing, the lower punches are guided into the second filling and dosing station through rails that are at the level of the upper dead center of the lower pressure roller. The second press material is filled into the die cavity by the second filling device. The second filling device does not interact with a filling curve as it has the first filling station. Rather, the gross filling depth for the second filling is generated by means of the immersion depth of the upper punch in the pressing station.

After the second filling material has been filled by the second filling device, the excess molding compound in the dosing station is pushed back into the second filling device and the net filling of the second layer remains in the die of the two-layer tablet to be compressed. The pressed-on layer made of the first pressed material is located below the second layer.

The disadvantage of rotary presses known from the prior art is that very large filling depths are usually required for filling the die cavity created by the upper punch for the second pressing layer, which is why upper punches must be provided that can achieve great immersion depths. It has been shown that fill depths of 10 to 25 mm are required in order to obtain acceptable results for the production of multilayer tablets, in particular two-layer tablets.

• 0 bis 10 mm
• 8 bis 18 mm
• 15 bis 25 mm.

In the rotary presses described in the prior art, immersion paths of up to 25 mm cannot be implemented with a single, rigid upper punch pull-down and lift curve. As a rule, three pairs of curves are used, for example for the following immersion depth ranges

• 0 to 10 mm
• 8 to 18 mm
• 15 to 25 mm.

If head-guided pressing tools are used in the rotary press, the individual curves are made entirely from one piece. Thus, with three different immersion depth ranges, three pull-down cams and three lift cams are required for a pressing station. If, on the other hand, pressing tools are guided with an inner and an outer roller, then it is not possible to manufacture these guide curves from one piece. Rather, the curves consist of three parts: an inner curve, an upper curve and an outer curve, which are fastened together as a package on the upper curve support. A curve pair therefore consists of, for example, three pull-down curve segments and three lift curve segments. With three different immersion depth ranges, 18 curve segments are required per press station. This is associated with high investments for the user, since these curves are made of hardened steel.

This disadvantage, combined with the use of a large number of cost-intensive curve segments, is multiplied if not only two-layer tablets are produced, but multilayer tablets with up to five different layers of pressed material. In addition to the high acquisition costs for the curve segments there is a considerable storage requirement for the cam segments, as well as a considerable logistical and control effort in order to prevent incorrect cam combinations from being built into the rotary press when re-equipping a rotary press. The correct equipping of a rotary press requires trained specialist staff, whose use is also associated with high costs.

From the SU 656 872 A1 a rotor tabletting machine is known which is intended to simplify the adjustment mechanism of the prepressing, pressing and ejecting rollers mounted on different levels. For this purpose, it is proposed to mount both the press roller and a carriage movably on an eccentric axis, a pre-press roller and an ejector roller being rotatably mounted in the carriage on both sides of the press roller.

Based on the prior art described, it is the object of the present invention to provide a rotary press that does not have the disadvantages of the rotary presses described in the prior art and, moreover, avoids the use of a large number of cost-intensive curve segments if this is necessary for the production of multilayer tablets that upper punches with immersion depths of up to 25 mm dip into the die bore.

Description of the invention:

According to the invention, the object is achieved by a rotary press for the production of single or multi-layer tablets with the features of claim 1 and by using a rotary press according to claim 10. This rotary press comprises at least one filling device for filling a press material into openings of a die plate, at least one Filling station, at least one metering station for the lower punch, at least one printing station and at least one ejection station with tablet scraper and tablet discharge chute, the at least one printing station each comprising an upper and a lower pressure roller and an upper and a lower curve sequence, the curve sequences with upper - and sub-stamping work together. The rotary press according to the invention is characterized in that at least one upper height-adjustable combination curve, comprising a pull-down cam, an upper pre-pressure rail, a safety rail and an elevator cam, and the lower cam sequence comprises a height-adjustable lower pre-pressure rail and a one-piece ejection cam, which are attached below the lower pressure roller. In the context of this invention, the catch curve is preferably also referred to as a safety rail. The terms form rail and form curve are preferably used synonymously in the context of the invention.

It is preferred to replace the use of an upper and a lower pre-pressure roller with an upper and a lower pre-pressure rail in the at least one pre-printing station. These pre-pressure rails are located on the left in front of the upper and lower pressure rollers. In the context of this application, the term "curve sequence" denotes a series of different curve segments and rails which together form an essentially closed circle. The curve sequence serves to guide the roller or head-guided pressing tools. It is preferred that the curve segments are fastened to the curve supports with screws. For the purposes of this invention, curves generally have a non-linear course and are rigid. Rails, on the other hand, are essentially linear and represent movable components of the rotary tablet press.

The term “printing station” preferably includes both main printing stations and pre-printing stations and pressing stations. The pressing process of a compact is preferably carried out in a main pressure station, and in connection with this main pressing process, the pressing forces for producing the compact are transferred from the main pressure rollers to the powder material to be pressed by means of the pressing tools. It is further preferred that the press material is vented in a pre-pressure station. Advantageously, during the main pressing process, the preferably total pressing time is then available for compressing the pressing material. A pressing station is preferably used in the production of multi-layer or shell-core tablets, for example, to lightly press a first powder material, which is preferably already in the die opening, and thereby advantageously prepare it for receiving, for example, a pellet core or a further filling layer.

The terms right and left are used in the context of this application as they are for an outside observer of an exemplary curve sequence, as in Figure 1 of the present application, results. In Figure 1 the position of an upper pressure roller is indicated in the middle, with the pre-pressure rail according to the invention being located on the left. For example, to the left of the pressure roller, within the curve sequence, there is the pull-down curve which guides the roller-guided upper punch shown in the direction of the die plate.

Figure 1 shows an upper curve sequence as it is present, for example, integrated in a rotary tablet press according to the invention. It is preferred that the pressure rollers are arranged above the curve sequence. The upper pressure roller points in the direction of an upper housing cover of the rotary tablet press, while the curve sequence faces a carrier plate on which the rotor stands. A movement in the direction of this carrier plate is referred to as a movement "downwards" in the context of this invention, while a movement in the direction of the upper housing cover in the context of this invention represents a movement "upwards".

The upper and lower pre-pressure rails advantageously have long straight running areas for the shaft rollers or the shaft heads of the pressing tools, that is to say the upper and lower pressing punches. This results in a pressure dwell time of the pre-pressing force in the area of the rails that is considerably longer than in the prior art. In connection with the use of shaft rollers, larger pre-pressure forces can advantageously be transmitted without friction over a longer distance without wear. In addition, the prolonged pressure dwell time of the pre-pressing force leads to improved ventilation of the press material.

It represents a further advantage of the invention that the shafts of the pressing tools can optionally be equipped with an inner and an outer shaft roller. When using two shaft rollers, these act on an inner and an outer pre-pressure rail, whereby an increased pre-pressing force and a longer pressure holding time can advantageously be realized compared to the use of pre-pressure rollers.

It has also proven to be very advantageous that the pre-pressure rails according to the invention are a space-saving alternative to pre-pressure rollers compared to pre-pressure rollers Represent transfer of a pre-pressing force. It is preferred that a pre-printing station take up the same space on the pitch circle of the curve sequence as the main printing station. This applies in particular when the main pressure rollers and the pre-pressure rollers advantageously have the same roller diameter. It was completely surprising that the pre-pressure rails according to the invention only require 20% of the space required by a printing station, so that the remaining space can be used for longer and softer control curves for controlling the pressing tools and for longer filling devices. The use of longer and flatter control cams advantageously ensures smooth, low-wear operation of the rotary press. Filling devices with a long design advantageously lead to an improved filling result for the die bores through the press material, as a result of which improved homogeneity and a uniform weight of the pressed parts obtained are achieved. Another surprising advantage is that a rotary press with upper and lower curves optimized in this way can run considerably faster, which leads to higher productivity.

It is preferred that the upper pre-pressure rail can be adjusted synchronously with the position of the pressure rollers. Advantageously, this synchronous height adjustability also makes it possible to precisely set the distance between the pre-pressure rail and the bottom dead center of the upper pressure roller. This reliably prevents uncontrolled plunging of the upper punch into the die bores. It was completely surprising that this advantage according to the invention can be realized independently of the set upper punch immersion depth. In conventional rotary presses described in the prior art, the upper punches can plunge into the die holes in an uncontrolled manner to a depth of several millimeters, since a rigid catch rail attached to the lower area of the upper curve support can only then catch the upper punches.

If, when using the adjustable pre-pressure rail according to the invention, the distance between the pre-pressure rail and the pressure roller is, for example, 0.5 mm and the pressure roller is set to an upper punch immersion depth of 3 mm, the upper punch can, for example, be at most 3.3 mm instead of the usual several millimeters if there is no press material , for example in the range of 6 to 8 mm, immerse into the die.

It is preferred that the height adjustment of the upper combination cam is carried out, including a pull-down cam and a lift-up cam, manually or automatically. Due to the flexible design of the height adjustment, the rotary press according to the invention can be individually adapted to the needs of the user. It is further preferred that the upper combination rail is firmly connected to the upper curved support after an adjustment.

The ejection curve is preferably used to eject the compacts produced. It is preferred that the tool pairs leave the pressing station after the production of the tablet has been completed. The upper punch is then preferably first raised by the elevator cam. During the upward movement of the upper punch, the lower punch preferably reaches the ejection rail, whereby the lower punch is advantageously raised parallel to the upper punch with a time delay. It is preferred that the upward movement of the lower punch pushes the finished pressed tablet from the pressing position in the die bore up to the upper edge of the dies or the die plate. The upper punch preferably has a minimum distance from the upper edge of the tablet at all times. In this way, contact between the tablet produced and the upper punch is effectively avoided, which contact could, for example, lead to damage or destruction of the tablet by bursting.

In a further preferred embodiment, the invention relates to a rotary press in which a closed, continuously height-adjustable safety rail is arranged between the pull-down cam and the lift cam in the area of the upper pressure roller. The average person skilled in the art knows that in conventional rotary presses there is no curved connection between the pull-down curve and the lift-up curve, so that this missing curve connection below the upper pressure roller results in a gap in the upper curve sequence. In conventional rotary presses, there is a rigid catch rail on the cam carrier that prevents the upper punch from falling through so that the upper punches do not fall uncontrollably onto the upper part of the tablet press rotor in the area between the pull-down curve and the lift curve. This rigid safety rail is usually arranged in the lower area of the curve support, so that, despite the presence of the rigid catch rail, the upper punches can still dip up to 10 mm into the die or fall into the area below the upper pressure roller.

The undesired immersion of the upper punches into the die is only harmless if either there are no lower punches in the rotor lower part or, if the lower punches are present in the die bores, the dies are filled with press material. In the first case, a collision of the upper and lower punches is avoided in that the lower punches are not present in the die bore. In the second case, the upper punch touches the material to be pressed without touching the pressing surfaces of the lower punch. The existing pressing material thus protects the pressing surfaces of the lower and upper punches from damage.

However, damage to the upper or lower punches can occur if the lower punches are located within the die bore and the rotary press is started by a motor without any press material being present in the die bores. When the upper punches plunge into the die bores in free fall at high speed up to 10 mm, they hit the pressing surfaces of the lower punches with great force, causing the lower and upper punch pressing surfaces to be damaged by engravings or break notches in the upper and / or lower punches become unusable. Acquiring new press tools involves considerable financial outlay and long delivery times. In addition, the damaged tools have to be identified and replaced, which leads to downtimes of the rotary press and increased personnel costs.

Similar damage can also occur during production if a material jam occurs. There is then the possibility that the rotary press runs empty, i.e. without pressing material, which enables a collision of the upper and lower punches. In order to avoid collisions between the upper and lower punches, provision is made according to the invention between the pull-down curve and the lift-up curve in the area below the bottom dead center of the upper pressure roller to provide a closed safety rail, which can be continuously adjusted in height.

In order to be able to adjust the upper combination rail consisting of a pull-down cam, pre-pressure rail, safety rail and a lift cam, advantageously only two clamping screws have to be loosened. The curve can then be moved up or down by turning an adjusting screw. This is preferably done as a function of the set position of the upper pressure roller. The combination cam has a feather key guide on its rear side, while the two clamping screws engage in the threaded holes in the cam carrier via an elongated hole in the combination cam. With this preferred arrangement, the combination curve is advantageously axially adjustable in height, but not radially movable.

The fastening configured as a clamp is preferably designed in a comparable manner in the case of the lower form pressure rail. The adjustment of the lower pre-pressure rail is advantageously easy to carry out for the operator of the rotary press, since a special handwheel is provided for this. It is preferred that when the lower pre-pressure rail is adjusted, the lower punches reach the pre-pressure rail from different height positions depending on the set metering position. This represents a technical challenge that is overcome with the present invention in that the upper punches always hit the movable transfer rails to the combination curve from the same position. The lower shafts are advantageously fed to the pre-pressure rail and passed on to the lower pressure roller, from where they pass to the next filling station or to the ejection station.

In a further preferred embodiment, the invention relates to a rotary press in which the upper pre-pressure rail is set back 0.3 to 1.0 mm with respect to the upper pressure roller. It is preferred that the pre-pressure rail is set back behind the bottom dead center of the upper pressure roller.
In the context of this invention, the terms “set back” and “stand back” mean that the pre-pressure rail is offset upwards with regard to the curve sequence. The average person skilled in the art knows that the phrase "upwards" With regard to the essentially circular curve sequence, it is to be understood that set-back components of the curve sequence have a smaller distance from a subsequent curve segment or the bottom dead center of the upper pressure roller. These definitions of the formulations apply equally to the upper and lower curve sequence.

It was completely surprising that rotary presses can be provided with a distance of 0.3 to 1.0 mm between the upper pressure roller and the pre-pressure rail, which operate particularly quietly and without machine vibrations. Advantageously, the distance according to the invention between the pre-pressure rail and the pressure roller results in a surprisingly smooth machine run.

In a further preferred embodiment, the invention relates to rotary presses with movable transfer rails that are arranged to the right and left of the combination curve and each have a swivel joint in the transition areas to the combination curve. The movable transfer rails are part of the upper curve support. The movable design of the transfer rails advantageously enables a long adjustment path of the upper punches of 0 to 25 mm. The swivel joints are thus each between the movable transition rails and the upper combination curve, in other words the upper combination curve is arranged between the two movable transition rails and is connected to them on the outer sides of the combination curve by means of the rotary joints.

The average person skilled in the art knows that a rotary joint enables the elements connected to the rotary joint to rotate in a spatial plane. This spatial plane is perpendicular to an imaginary axis through the center point of the swivel joint, which in the context of this invention is also referred to as the "axis of rotation" or "axis of the rotary movement". The axis of rotation of the swivel joints according to the invention advantageously coincides with an imaginary connecting line between the center point of the circular curve and the swivel joint.

In a further preferred embodiment of the invention, the movable transfer rails each have a ball joint to compensate for changes in angle and length on the transition rails that are rigid in a transition area on. It is preferred that rigid transition rails adjoin the movable transition rails on the sides facing away from the upper combination curve. The rigid transition rails and the movable transition rails are each advantageously connected to a ball joint which enables angle and length compensation so that the movable transition rails do not jam when the immersion depth of the upper punch increases.

By using the movable transition rails, which are connected to rigid transition rails by means of ball joints and to the upper combination curve by means of swivel joints, a rotary press can be provided in which the plunger depths of the upper punches can be implemented in a range between 10 to 25 mm in particular. Thus, the rotary presses according to the invention are able, for example, to press press materials with a high compression ratio of 3: 1 to 5: 1, which are used, for example, in the production of multilayer tablets. Special pressing materials, such as poly waxes, also require large filling depths and, associated with this, correspondingly large upper punch immersion depths.

It was completely surprising that the movable design of the transfer rails in conjunction with the use of ball and swivel joints in the transition areas to the rigid transfer rails and the upper combination curve made it possible to provide an upper curve sequence, so that an upper punch immersion area of 0 to 25 mm is covered can be. The use of movable transfer rails is particularly advantageous because it eliminates the need for different pairs of curves. This can save acquisition costs for additional rails and curves, as well as expenses for the storage of rails and in the area of logistics. In addition, the assembly of different curves and rails is avoided, which reduces the personnel expenditure when operating the rotary tablet press according to the invention. In particular, however, the control effort required to determine whether the correct curves are used in combination with the pressing material to be pressed is also eliminated.

The adjustable pre-pressure rail is preferably an integrated part of the pull-down and elevator rail and is located below the upper pressure roller in the upper curve sequence. The attachment of the adjustable pre-pressure rail to the upper curve support is preferably implemented by means of two screws, the attachment being designed to be displaceable. The shift is preferably possible in that the fastening bores of the fastening screws are designed as elongated holes. It is preferred that the fastening screws are loosened in order to adjust the upper combination rail. After loosening the fastening screws, an adjusting screw can be turned to the right or to the left, whereby the height of the combination rail can be adjusted upwards or downwards according to the position of the upper pressure roller. After the combination rail has been adjusted, the two fastening screws with which the upper combination rail is attached to the curve support are tightened again. It is preferred that the upper combination rail is firmly connected to the upper curve support again after the height adjustment. The interaction of the fastening screws with the elongated holes advantageously ensures that the pre-pressure rail can be adjusted in height.

It was completely surprising that the height-adjustable design of the combination rail enables a rotary press to be provided which covers a complete adjustment range of the upper punches from 0 to 25 mm immersion depth. It is further preferred that the upper combination rail has a long feather key on its rear side, which enables axial movement in a corresponding groove in the cam carrier, but prevents radial movement. The term "rear side" in the context of this invention denotes the side of the upper combination curve facing away from the outside observer of the upper curve sequence, that is, the rear side of the combination curve according to the invention faces the imaginary center point of the circular curve sequence.

In a further preferred embodiment, the invention relates to a rotary tablet press in which the lower pre-pressure rail is arranged on a rocker. In the context of the present invention, a rocker arm is a rotatable rail that has its pivot point for an outside observer of the curve sequence on the left side has. On the right side of the rocker, this is supported with its underside on the load cell, which preferably measures and displays the pre-pressure forces.

It is preferred that the lower pre-pressure rail is fastened to the rocker arm, which is preferably of stable design, by means of fastening means. For example, it is possible to use fastening screws as fastening means. The rocker is advantageously rotatably fastened to a plate by means of further fastening means, for example bolts. This plate has on its rear side, that is to say on the side facing away from the outside observer of the lower curve sequence, a long feather key which engages in a corresponding groove in the lower curve support. This feather key guide advantageously enables an axial movement of the plate; however, this type of fastening prevents the plate from moving radially.

It is a further advantage of the invention that the fastening according to the invention of the lower pre-pressure rail by means of a rocker on a plate ensures the parallel height adjustability of the plate and the lower pre-pressure rail. This type of height shift for the lower pre-pressure rail is particularly simple and less prone to errors for the user of the rotary press according to the invention. This is particularly advantageous because the lower pre-pressure rail has to be adjusted more frequently than, for example, the upper pre-pressure rail, depending on the desired thickness to be set for the compact to be produced.

In a further preferred embodiment, the invention relates to a rotary press in which a movable lower transfer rail is arranged in the lower curve sequence between a metering curve and the lower pre-pressure curve, the movable lower transfer rail being connected to the lower pre-pressure rail on the right-hand side by means of a swivel joint and the movable transfer rail on the left side is connected to the dosing curve by means of a ball joint. The height-adjustable lower pre-pressure rail changes its position relative to the dosing curve with every height adjustment carried out. The inventive arrangement of the movable lower transfer rail between the metering curve and the lower pre-pressure curve, a smooth and stepless transfer of the lower shafts of the lower punches from the metering curve to the lower pre-pressure curve is advantageously provided. This advantageously prevents the lower shafts from getting caught in the area of the movable transfer rail.

It is preferred that the movable lower transfer rail is pivotably and displaceably mounted, which is achieved by connecting the movable lower transfer rail by means of a swivel joint on the right side of the movable transfer rail to the lower prepressure rail. On the left side of the movable lower guide rail, the movable guide rail is connected to the metering curve by means of a ball joint. The swivel joint advantageously represents a fixed pivot point of the movable transfer rail, while the ball bearing on the left-hand side enables a rotary and pushing movement of the movable transfer rail.

It is further preferred that a double-sided ejection rail is provided to the right of the lower pressure roller of the pre-printing station and the adjustable lower pre-pressure rail, which serves to measure the ejection force by means of a measuring cell. Advantageously, the ball bearing of the movable lower transfer rail enables a compensation for height and length changes that occur when the lower pressure rail is adjusted in height.

In a further preferred embodiment, the invention relates to a rotary press in which the lower pre-pressure rail can be adjusted in height automatically or manually using a handwheel. It is preferred that the setting of the relative position of the lower pre-pressure rail with respect to the lower pressure roller is measured with a spindle and displayed with a clock. The plate connected to the lower pre-pressure rail can advantageously be clamped to the lower curve support by means of fastening means, for example a screw, after the lower pre-pressure rail has been adjusted. The adjustability of the lower pre-pressure rail enables the rotary press according to the invention to be optimally adapted to different operational requirements that differ from one another Compact geometries, for example the desired thickness of a compact, can be determined.

In a further preferred embodiment, the invention relates to a rotary press in which the lower pre-pressure rail is set back by 0.3 to 1.0 mm with respect to the lower pressure roller. Due to the set-back arrangement of the lower pre-pressure rail opposite the top dead center of the lower pressure roller by 0.3 to 1.0 mm it is advantageously achieved that the pre-pressure force applied within the pre-pressure station is smaller than the main pressure force applied within the main pressure station. This is necessary because the upper and lower pre-pressure rails and their brackets are not designed to absorb the high press forces that occur within a main pressure station. A faulty arrangement of the upper or lower pre-pressure rails opposite the upper or lower pressure rollers leads to an immediate stop of the drive of the rotary tablet press according to the invention

In a further preferred embodiment, the invention relates to a rotary tablet press in which the lower pre-pressure rail is attached manually and / or automatically to the lower curve sequence and / or clamped by means of fastening means. The fastening means can preferably be fastening screws with which the lower pre-pressure rail is fastened to the rocker. The fastening of the lower pre-pressure rail advantageously enables the height adjustment of the pre-pressure rail with respect to the lower pressure roller, which ensures that the rotary press according to the invention can be operated easily.

In a further aspect, the invention relates to the use of the rotary tablet press according to the invention, a distance between the upper pre-pressure rail and the upper pressure roller being measured and displayed by a clock. The clock for measuring and displaying the distance between the upper pre-printing rail and the upper pressure roller is preferably arranged above the upper pre-printing rail by means of a holder and is connected to the upper pre-printing unit by means of fastening means, for example a screw. Advantageously determined the clock at all operating times and displays the actual distance between the upper pre-pressure rail and the upper pressure roller. This preferably enables the actual operating parameters of the rotary tablet press according to the invention to be recorded.

It was completely surprising that the measurement and display of the actual distance between the upper pre-pressure rail and the upper pressure roller required by the movable design of the pre-pressure rail can be realized by means of a technically simple device, such as a mechanical rotary display instrument.

In a further embodiment, the invention relates to the use of a rotary press in which a measurement and a display of the distance between the upper pre-pressure rail and the upper pressure roller takes place mechanically and / or electronically, the measurement result being displayed on a touch panel. The average person skilled in the art knows that a touch panel is a touch screen or touch screen, the terms being used synonymously in the context of the present application. A touch panel is a combined input and output device in which the program sequence of the rotary press can be controlled directly by touching parts of an image on a screen as part of the touch panel. It is preferred that the touch panel is a device that reacts in particular to resistive and capacitive inputs.

This alternative embodiment of the invention corresponds to the modern requirements for the simple operability of a rotary press, with the results of a distance measurement, which can be carried out manually or electronically, advantageously being displayed in a touch panel. The display of the measurement results in a touch panel is particularly advantageous because the user of the rotary press can react to the displayed results without wasting time and can enter them directly via the touch panel.

In a further preferred embodiment, the invention relates to the use of a rotary press in which a zero position between the upper pre-pressure rail and the upper pressure roller, a zero position between the lower pre-pressure rail and the lower pressure roller is monitored mechanically and / or electronically. In the context of this application, the zero position is that position in which the lower pre-pressure rail and the upper dead point of the lower pressure roller are at the same level. Similarly, the zero position for the upper curve sequence is determined by the level of the upper pre-pressure rail with the lower dead center of the upper pressure roller. It is necessary that the pre-pressure rails are always arranged set back with respect to the dead centers of the pressure rollers, preferably by an amount of 0.3 to 1 mm, so that the pre-pressing force is always smaller than the main pressing force. Otherwise there would be damage to the pre-pressure rails and their holders, since they are not designed for the high pressing forces that occur during the main pressure in the main pressing station.

In a further preferred embodiment, the invention relates to a use of the rotary press in which the rotary press is automatically stopped when the upper pre-pressure rail is located below the upper pressure roller and / or the lower pre-pressure rail is located above the lower pressure roller. It is preferred that this stop mechanism is implemented by limit switches that are provided on the upper and lower adjustment of the pre-pressure rails. It is preferred that these limit switches stop the rotary press when it reaches a zero position.

In a further preferred embodiment, the invention relates to the use of a rotary tablet press in which a pre-pressing force is also measured on the upper pre-pressure rail by means of a measuring cell and the measured pre-pressing force is displayed on the touch panel. It is preferred that the pre-pressure force arising between the upper and lower pre-pressure rails during the pressing process is measured with a measuring cell and displayed on a touch panel. The measuring cell is preferably attached to the plate of the lower pre-pressure unit, which is connected to a rocker and the lower pre-pressure rail. It is preferred that the measuring cell protrudes through the rocker. The lower pre-pressure rail is attached to the rocker arm in the area of the measuring cell with fastening means, for example two fastening screws. It is preferred that the underside of the lower pre-pressure rail has mechanical contact with the upper side of the measuring cell.

If, for example, loads on the lower pre-pressure rail occur due to the rollers of the shafts of the lower ram, these loads are transmitted as force to the rocker arm, the rocker arm on this power transmission being able to move slightly downwards on the right side due to its rotatable mounting at a fixed pivot point . When the rocker moves downwards, the underside of the pre-pressure rail presses on the face of the measuring cell and causes a force signal, which is advantageously displayed in the touch panel. It was completely surprising that a measuring cell for recording the pre-pressure force can preferably be implemented in the lower pre-pressure rail. It is further preferred that the clamping of the lower pre-pressure rail takes place manually or automatically.

In the context of the invention, it is preferred that the rotary press comprises a measuring cell with which the pre-pressure forces that occur between the upper and lower pre-pressure rails during the pressing process can preferably be measured and displayed on the touch panel. It is preferred that the measuring cell is arranged and / or fastened on the plate and protrudes through the rocker. The lower pre-pressure rail is preferably fastened to the rocker in the area of the measuring cell with preferably two screws, in particular screwed tight, with an underside of the lower pre-pressure rail being in mechanical contact with the measuring cell. When the lower pre-pressure rail is loaded by the preferably two rollers of the lower punch shaft, the force is preferably transferred to the rocker, the rocker being able to give way slightly downwards under load via the pivot point. The downward movement of the rocker preferably presses the lower pre-pressure rail onto an end face of the measuring cell, whereby a force signal is advantageously generated which can be displayed on the touch panel, for example.

It is also preferred in the context of the invention that the rotary press is set up to ensure position monitoring of the lower pre-pressure rail. For this purpose, the rotary press preferably comprises a rising lower pre-pressure rail, which is preferably arranged exactly below the upper pre-pressure rail and preferably acts on the rollers of the lower press ram shafts. Due to this advantageous arrangement of the rising lower pre-pressure rail, a desired pre-pressure force is exerted on the press material, which is preferably located in the bores of the dies between the surfaces of the upper and lower punches. The (zero) position of the lower pre-pressure rail can preferably be monitored by a rocker arm and a limit switch. A fastening of the plate to the lower curve support can for example be achieved with a fastening means such as a screw.

• Fig. 1 eine bevorzugte Ausführungsform eines oberen Kurvenablaufs einer Rundlaufpresse
• Fig. 2 einen Ausschnitt einer bevorzugte Ausführungsform eines oberen Kurvenablaufs einer Rundlaufpresse (Rückansicht)
• Fig. 3 eine bevorzugte Ausführungsform eines unteren Kurventrägers mit Kurvenablauf einer Rundlaufpresse

The invention is described in more detail using exemplary embodiments and the following figures; it shows:

• Fig. 1 a preferred embodiment of an upper curve sequence of a rotary press
• Fig. 2 a section of a preferred embodiment of an upper curve sequence of a rotary press (rear view)
• Fig. 3 a preferred embodiment of a lower curve support with curve sequence of a rotary press

Fig. 1 shows a preferred embodiment of an upper curve sequence (17) of a rotary press. Schematic is in the Fig. 1 an upper pressure roller (3) indicated. This interacts with the press punches and creates the tablet in the die holes of the dies. Shown in Fig. 1 is in particular the upper pre-printing unit (1), which preferably consists of the inner pre-printing rail (1.1), the outer pre-printing rail (1.2) and the safety rail (1.3), the upper pre-printing unit (1) being synonymously referred to as a combi-curve within the meaning of the invention. The inner pre-pressure rail (1.1.) And the outer pre-pressure rail (1.2) are preferably designed to be adjustable. It is preferred in the context of the invention that for this purpose the fastening screws (2.1 and 2.2) are first loosened. By adjusting the adjusting screw (6), the position and / or height the upper pre-pressure rail (1) can be set according to the position and / or position of the upper pressure rollers (3), the zero position of the upper pressure roller (3) being advantageously monitored in relation to the pre-pressure rail (1) by a sensor (8). It is further preferred that the actual distance between the upper pressure roller (3) and the pre-pressure rail (1) takes place by means of a clock (7), in particular a dial gauge, which is also shown in Fig. 1 is shown. A holder (4) for the dial gauge and a fastening screw (5) for this holder are also shown. After adjusting the pressure rail (1) in relation to the pressure roller (3), the two screws (2.1 and 2.2) can be tightened again.

It is further preferred that the curve support (17) comprises feather keys (18) on its inside, which advantageously allow an axial movement of the form rails (1.1 and 1.2) in a groove in the curve support (17) and a radial movement of the form rails (1.1 and 1.2) advantageously prevent.

It is preferred in the context of the invention that the safety rail (1.3) is arranged between the pre-pressure rails (1.1 and 1.2); in the context of the invention, it is preferably also referred to as a safety rail or integrated safety rail. It is advantageously arranged below the bottom dead center of one of the upper pressure rollers (3) and thus advantageously replaces a gap in the cam path that is present between the pull-down and the elevator cam in conventional tablet presses. The gap enables the upper punches to plunge into the die over a larger area of the cam path in order to transfer the compression pressure to the tablet material to be compressed. In conventional presses, in order to prevent the upper punch from immersing too deeply in the die in the area below the upper pressure roller (3), a so-called catch curve is usually provided, which allows the punch heads to be placed on the upper rotor part or the press punch to fall out of the cam track should prevent. However, in practice it has been shown that problems can arise with this construction if there is no press material in the die and the upper punch would be pressed onto the uncovered lower punch without braking.

The risk of such mechanical damage to the press ram is avoided by providing the integrated safety rail (1.3). Since the adjustable Pre-pressure bar (1.1 and 1.2) is preferably 0.3 to 1.0 mm behind the pressure roller (3), the upper punch can also only dip into the die by this amount beyond the pressure roller (3), which means that the press punch Surfaces is completely excluded. Advantageously, the outer pre-pressure rail (1.2) in the sense of the invention can also function as a pull-down curve and is also referred to synonymously as such.

It is preferred that the inner pre-pressure rail (1.1) is arranged below an upper pressure roller (3) and can be fastened to the cam carrier (17) with two screws (2.1 and 2.2), which are preferably designed as clamping screws. It is preferred in the context of the invention that the fastening bores for the screws (2.1 and 2.2) are designed as elongated holes (2a and 2b), so that the inner form-pressure rail (1.1) can advantageously be moved.

A transition curve (not shown) can be used to accommodate the upper shafts of the press punches while dies of the die plate are being filled by a filling device. The transition curve can preferably be arranged between the movable rails (10 and 15), so that the transition curves are preferably each arranged between one of the preferably three pressure rollers (3) within the upper curve sequence (17). The transfer rail can include a sensor (not shown) which is set up to monitor the stiffness of the upper ram and the upper ram removal opening. It is preferred that when the rotor rotates counterclockwise, the upper shafts of the press ram are fed to the upper pre-pressure rail (1) via preferably movable rails (10). At the end of the rails (10), the inner shaft rollers after the joint (9), which is preferably designed as a swivel joint, can be transferred to the pull-down curve of the pre-pressure rail (1), where they are preferably pulled down. The shafts are preferably transferred to the inner pre-pressure rail (1.1) and the outer pre-pressure rail (1.2), whereupon the shafts are further lowered until a straight running area of the pre-pressure rails (1.1 and 1.2) is reached.

It is preferred that the upper pre-pressure unit (1) and the pre-pressure rails (1.1 and 1.2) are designed to be height-adjustable with respect to the pressure rollers (3). This height adjustment can advantageously take place manually or automatically. It puts A particular advantage of the invention is that an optimal position of the pre-pressure rail (1, 1.1, 1.2) in relation to the bottom dead center of the pressure roller (3) can be set independently of the position and / or position of the upper pressure rollers (3).

Fig. 1 further shows the preferably movable, i.e. adjustable, transfer rails (10 and 15), as well as the preferably rigid transfer rails (12), the rigid transfer rails (12) preferably being arranged in such a way that they advantageously allow the upper shafts of the press ram to pass over the filling devices enable the tablet press. For the purposes of the invention, it is preferred to designate the transfer rail (10) synonymously as the inlet rail and the transfer rail (15) as the outlet rail. Fig. 1 shows that the movable transfer rails (10 and 15) for guiding the upper shafts between the filling device and the upper pressure roller (3) are preferably arranged between the preferably rigid transfer rails (12) and the pre-pressure unit (1).

The preferably movable design of the transfer rails (10 and 15) represents a significant advantage over conventional tablet presses, since the mobility of the transfer rails (10 and 15) enables the upper shafts to be transferred from the preferably rigidly designed transfer rails (12) which are firmly attached to the curve support. to the height-adjustable pre-pressure rails (1.1 and 1.2) is made possible. In the context of the invention, it is particularly preferred if the preferably movable transfer rails (10 and 15) compensate for and / or overcome the height differences between the preferably rigid transfer rails (12) and the height-adjustable pre-pressure rails (1.1 and 1.2) resulting from the height adjustability . This is advantageously ensured by the provision of joints (9 and 14) according to Fig. 1 at the transfer point between the inlet rail (10) and the pre-pressure rail (1) or at the transfer point between the pre-pressure rail (1) and the outlet rail (15) and are preferably designed as swivel joints. Due to the preferably movable design of the transition rails (10, 15), length compensation is required, which is preferably carried out by means of further joints (11) compared to the preferably rigid transition rails (12), these joints preferably being referred to as compensating joints and being designed as ball joints. The provision of the joints (9, 11, 14) causes jamming the inlet rail (10) and the outlet rail (15) are avoided particularly effectively, as a result of which a smooth flow of the tablet production process is promoted.

Another advantage of the invention is that the shafts can be axially guided by means of rollers, whereby the inner guide rollers of the shafts within the curve support (17) or its components are surprisingly effective due to the in particular one-sided height adjustment of the transition rails (10 and 15) is prevented. This is advantageously due to the fact that, unlike conventional head-guided press ram shafts, there is no need to provide a large headroom for the movement of the shafts, which in particular can considerably reduce the risk of severe mechanical damage due to the shafts becoming jammed. The advantages mentioned here for the preferably movable transfer rails (10 and 15) also apply to the transfer rails (10 and 15) preferably attached between other pressure rollers (3) in the curve sequence.

Fig. 1 shows a section of an upper curved support (17), which can include, for example, three pressure rollers (3). However, the invention is not limited to such cam supports, but can be used in particular in single, double and triple presses, the number of pressure rollers (3) being able to vary.

Fig. 2 shows a section of a preferred embodiment of an upper curve sequence (17) of a rotary press. In particular, in Fig. 2 a detailed view of a rear view of a preferred curve sequence (17) is shown, ie a view as it can be shown, for example, from the interior of the tablet press.

Fig. 3 shows a section of a preferred embodiment of a lower curve support (19) with a curve sequence of a rotary press. In particular, the position of the lower pressure roller (23) within the curve sequence of the curve carrier (19) is shown schematically. In the Fig. 3 The preferred embodiment shown of the lower curve (19) advantageously enables the pre-pressure force to be measured and thus contributes significantly to quality management within the tablet production process at. The lower pre-pressure station preferably comprises a lower pre-pressure rail (24), which is preferably fastened with two screws on a preferably stable rocker (27), the rocker (27) preferably being designed to be rotatable and attached to a plate (29) by means of a bolt (27a) ) can be attached.

The plate (29) preferably comprises a feather key (44), which preferably engages in a corresponding groove in the cam carrier (19), which advantageously enables axial feather key guidance of the plate (29), but effectively prevents radial movement. In the context of the invention, it is preferred that the plate (29) is supported on a wedge (30) which can move axially in two guide rails (42). A star grip (31) and a spindle (31a) advantageously enable the wedge to be adjusted to the right or left. According to the invention, it is preferred that the wedge (30) moves to the right when the star grip (31) is rotated to the right, the spindle (31a), which is preferably formed by an adjusting spindle, follows this right-hand movement. In particular, this adjustment movement leads to a preferably parallel lifting of the plate (29) and the lower pre-pressure rail (24). Analogously, turning the star grip (31) and the adjusting spindle to the left preferably leads to a preferably parallel lowering of the plate (29) and the lower pre-pressure rail (24). This particularly convenient configuration of the adjustability of the lower pre-pressure rail (24) is particularly advantageous because the lower pre-pressure rail (24) has to be adjusted relatively frequently in practice, since with the height and / or position adjustment of the lower pre-pressure rail (24), for example, the desired tablet thickness can be adjusted. After the adjustment of the lower pre-pressure rail (24) has been completed, the plate (29) can be fastened to the curve support (19) with a screw (35), for example by clamping.

It is preferred in the context of the invention that a zero position of the lower pre-pressure rail (24) can be monitored with a rocker arm (28) and a limit switch (36), the zero point being defined in particular when the lower pre-pressure rail (24) and the upper dead center of the lower pressure roller (23) are at the same height as one another. In the context of the invention, it is particularly preferred that the lower pre-pressure rail (24) is arranged, for example, 0.3 to 1.0 mm behind the top dead center of the lower pressure roller (23) so that the Form pressure is advantageously smaller than the main pressure. Advantageously, the upper zero point sensor (8) and the zero point limit switch (36) form a safety device within the tablet press, with which the tablet press can preferably be stopped instantaneously if the upper (1) or lower (24) pre-pressure rail is incorrectly set.

Another advantage of the in Fig. 3 The preferred embodiment of the lower curve (19) shown here consists in that the height and / or position setting of the lower pre-pressure rail (24) can be measured with a spindle (34) and displayed with a clock (32), preferably a dial gauge.

The height adjustability of the lower pre-pressure rail (24) means that the position of the lower pre-pressure rail (24) changes relative to the metering curve (21). In order to ensure a smooth and problem-free transfer of the lower punch shafts between the individual components of the lower curve sequence (19), the lower transfer rails (43) are also designed to be movable, and in particular are mounted pivotably and displaceably. The advantages mentioned above with regard to the preferably movably configured transition rails (10 and 15) preferably apply analogously. According to the invention, it is preferred that the transfer rail (43) has a joint (25) in the transition area to the lower pre-pressure rail (24), which is advantageously designed as a swivel joint. At the other end, the transfer rail (43) preferably has a joint (26) which is preferably designed as a ball (bearing) joint and advantageously enables a rotating and / or sliding movement.

List of reference symbols

1

Upper form unit

1.1

Inner adjustable pre-pressure rail

1.2

External adjustable pre-pressure rail

1.3

Safety rail (catch rail)

2.1

Clamping screw

2.2

Clamping screw

2a

Long hole

2 B

Long hole

3

Upper pressure roller

4th

Holder for dial indicator

5

Fixing screw for 4

6th

Adjusting screw

7th

Dial indicator

8th

Upper zero point sensor

9

Swivel joint

10

Movable transfer rail, inlet rail

11

Ball joint

12th

Transfer rail

14th

Swivel joint

15th

Movable transfer rail, outlet rail

17th

Upper curve sequence

18th

Adjusting spring

19th

Lower curve support with curve sequence

21st

Dosing curve

22nd

Adjustment of the dosing curve

23

Lower pressure roller

24

Lower form rail

25th

Swivel joint

26th

Ball joint

27

Swing arm for lower form rail

27a

bolt

28

Zero point rocker arm

29

plate

30th

wedge

31

Star grip

31a

spindle

32

Dial indicator

33

Lead screw bearings

34

Threaded spindle

35

Clamping screw

36

Zero point limit switch

42

Guide rail

43

Movable transfer rail

44

Adjusting spring

45

Roller bolt

46

Output curve

Claims (15)

1. A rotary press for the production of single-layered or multilayered tablets, comprising at least one filling device for filling a pressing material into openings of a die plate, at least one filling station, at least one metering station for the lower punches, at least one pressing station, and at least one ejection station having tablet stripper and tablet discharge chute, wherein the at least one pressing station comprises respectively an upper (3) and a lower pressure roller (23) and respectively an upper (17) and a lower cam track (19), wherein the cam tracks interact with upper and lower punches
   characterized in that
   at least one vertically-adjustable upper combination cam (1), comprising a pull-down cam (1.1), an upper initial pressure rail (1.2), a safety rail (1.3), and a pull-up cam is provided arranged below the upper pressure roller (3), and the lower cam track (19) comprises a vertically-adjustable lower initial pressure rail (24) and an integral ejection cam (46), which are provided attached below the lower pressure roller (23).
2. The rotary press as claimed in claim 1,
   characterized in that
   a continuous vertical adjustment of the upper initial pressure rail (1.2) takes place synchronously with a vertical adjustment of the upper pressure roller (3)
3. The rotary press as claimed in claim 1 or 2,
   characterized in that
   the upper initial pressure rail (1.2) is provided arranged set back 0.3-1.0 mm in relation to the upper pressure roller (3) and the lower initial pressure rail (24) is provided arranged set back 0.3-1.0 mm in relation to the lower pressure roller (23).
4. The rotary press as claimed in one or more of the preceding claims,
   characterized in that
   the at least one upper combination cam is provided attached by means of pivot joints (9, 14) on movable upper transition rails (10, 15).
5. The rotary press as claimed in claim 4,
   characterized in that
   the movable transition rails (10, 15) are provided connected to rigid transition rails (12) by means of ball joints (11) for compensating for angle and length changes.
6. The rotary press as claimed in one or more of the preceding claims,
   characterized in that
   the lower initial pressure rail (24) is provided arranged on a swing arm (27)
7. The rotary press as claimed in one or more of the preceding claims,
   characterized in that
   a movable lower transition rail (43) is provided arranged in the lower cam track (19) between a metering cam (21) and the lower initial pressure rail (24), wherein the movable transition rail (43) comprises a pivot joint (25) in a transfer region to the initial pressure rail (24), and on the opposing side comprises a ball joint (26) to compensate for height and length changes.
8. The rotary press as claimed in one or more of the preceding claims,
   characterized in that
   the lower initial pressure rail (24) is adjustable in height manually via a handwheel and/or automatically.
9. The rotary press as claimed in one or more of the preceding claims,
   characterized in that
   the lower initial pressure rail (24) is attachable manually and/or automatically to the lower cam track (19) by means of fasteners.
10. A use of a rotary press as claimed in one or more of the preceding claims 1 to 9,
    characterized in that
    a vertical adjustment of the upper combination cam is performed manually and/or automatically.
11. The use of the rotary press as claimed in claim 10,
    characterized in that
    a measurement of a distance between the upper initial pressure rail (1.2) and the upper pressure roller (3) is performed mechanically and/or electronically, wherein a result of the distance measurement is displayed in a touch panel.
12. The use of the rotary press as claimed in claim 10 or 11,
    characterized in that
    a null position between the upper initial pressure rail (1.2) and the upper pressure roller (3) and between the lower initial pressure rail (24) and the lower pressure roller (23) is monitored mechanically and/or electrically.
13. The use of the rotary press as claimed in one or more of claims 10 to 12,
    characterized in that
    the rotary press is automatically stopped if the upper initial pressure rail (1.2) is provided arranged above the upper pressure roller (3) and/or the lower initial pressure rail (24) is provided arranged above the lower pressure roller (23).
14. The use of the rotary press as claimed in one or more of claims 10 to 13,
    characterized in that
    an initial pressing force on the upper initial pressure rail (1.2) is measured and the initial pressing force is displayed in the touch panel.
15. The use of the rotary press as claimed in one or more of claims 10 to 14,
    characterized in that
    the initial pressing force is measured by means of a measurement cell by loading the measurement cell by the lower initial pressure rail (24).

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