Rotary pressing machine

Abstract

The invention relates to a rotary press comprising a rotor which can be rotated by means of a rotary drive and which has upper and lower punch guides for upper and lower press punches and a die plate arranged between the punch guides, the press punches interacting with the cavities of the die plate, and a filling device, the invention relates to a rotary press for filling a powder material to be pressed into a cavity of a mold disc, comprising a pressure device having an upper and a lower pressure unit which, during operation, interacts with an upper and a lower pressing punch in order to press the powder material in the cavity into a pressed article, comprising a scraping device, and a scraping device for scraping off the pressed product ejected onto the upper side of the mold plate by the lower pressing punch after pressing, the scraping device having a scraping channel arranged at least partially above the mold plate in order to guide the pressed product ejected onto the upper side of the mold plate from the mold plate to the first pressed product outlet along the scraping channel.

Description

TECHNICAL FIELD

[0001] The invention relates to a rotary press comprising a rotor which is rotatable by means of a rotary drive, the rotor having an upper punch guide for upper pressing punches and a lower punch guide for lower pressing punches and a die disc arranged between the upper punch guide and the lower punch guide, the pressing punches cooperating with the cavities of the die disc, the rotary press furthermore comprising a filling device by means of which a powder material to be pressed is filled into the cavities of the die disc, and the rotary press comprising a pressure device having an upper pressure unit and a lower pressure unit which in operation cooperate with the upper pressing punches and the lower pressing punches in order to press the powder material in the cavities of the die disc into pressed products, and the rotary press comprising a scraping device for scraping off the pressed products which after pressing are ejected by the lower pressing punches onto the upper side of the die disc, the scraping device having a scraping channel which is arranged at least partially above the die disc, whereby the pressed products which are ejected by the lower pressing punches from the cavities onto the upper side of the die disc are guided from the die disc along the scraping channel to a first pressed product outlet. BACKGROUND

[0002] In a rotary press usually a plurality of upper pressing punches and lower pressing punches are provided which are assigned in pairs to one cavity of a die disc. In the operation of the rotary press the upper pressing punches and the lower pressing punches rotate together with the die disc, the axial movement of the upper pressing punches and the lower pressing punches being controlled by a control cam structure and being guided by the upper punch guide and the lower punch guide. During the rotation the die disc is guided by different devices of the rotary press, namely a filling device in which a powder material to be pressed is guided into the cavities of the die disc and a pressure device in which the upper pressing punches and the lower pressing punches are pressed into the cavities, usually by means of upper pressure rollers and lower pressure rollers, in order to press the powder material into pressed products, such as tablets. After the pressure device the upper pressing punches are guided upwardly away from the cavities and the pressed products produced in the cavities are pushed by the lower pressing punches onto the upper side of the die disc. Such a rotary press furthermore comprises a scraping device for scraping off the pressed products which after the pressing process are ejected by the lower pressing punches onto the upper side of the die disc. The scraping device comprises a scraping channel which is arranged at least partially above the die disc and which guides the pressed products which are ejected onto the upper side of the die disc from the die disc which rotates underneath the scraping channel to a first pressed product outlet. The first pressed product outlet can be, for example, an outlet for identifying the pressed products as being qualified.

[0003] To ensure that the tablets are smoothly transported to the first press product outlet, in DE 10 2016 101 027 B4 and DE 102016 101 028 B4 a negative pressure device is provided in the goods channel adjoining the scraper, which sucks the tablets directed by the scraper in the direction of the goods channel off the mold plate by means of negative pressure and transports them through the goods channel. In this way, it is possible to avoid individual press products remaining on the mold plate and to enable smooth removal of the press products. In addition, it is also possible to stabilize the press products on the mold plate with an air curtain. To this end, a constant air flow can be directed at the press products, which presses the tablets onto the mold plate.

[0004] Although with the negative pressure device explained above it is achieved that the tablets are reliably transported out of the goods channel as soon as they are in the goods channel, under the most unfavorable conditions the tablets can jam after leaving the respective mold cavity, in particular because the tablets are accelerated in the vertical direction during the ejection by the lower press ram. In addition, the scraper device with the negative pressure device has a large space requirement in the rotary press and, in order to reliably suck out the tablets, requires a high flow of the suction air, which is expensive in particular in the pharmaceutical sector, and thus a large amount of the suction air. SUMMARY

[0005] Based on the prior art, it is the object of the present application to provide a rotary press of the type mentioned at the outset, which reliably enables the transport of press products to the first press product outlet at any time in a space-saving and resource-saving manner.

[0006] The object is achieved by the subject matter of independent claim 1. Advantageous design solutions are given in the dependent claims, the description and the drawings.

[0007] For a rotary press of the type mentioned at the outset, the object is achieved by the present application in that the section of the scraper channel arranged above the mold plate has a negative pressure device, by means of which the press products present on the mold plate are sucked along the scraper channel to the first press product outlet.

[0008] The basic structure of a rotary press as subject matter of the present invention has already been explained above. As described above, the upper and lower punch guides guide the punches during their axial movement. The punch heads cooperate with a control curve structure which moves the punches in axial direction, in particular towards and away from each other, during their rotation with the rotor. The control curve structure is usually composed of a plurality of control curve elements. These control curve elements can either accommodate the punch heads in corresponding guide accommodations or can only abut against the mirror surface of the punch heads. The pressure device usually comprises an upper and a lower pressure roller which cooperate with the punch heads of the upper or lower punch. A plurality of such types of pressure devices, for example a pre- and a main pressure device, can also be provided. An ejection curve structure as part of the control curve structure moves the lower punch upwards after the production of a pressed product in the corresponding cavity, so that the pressed product reaches the upper side of the die plate from where it is transported through a scraping channel to a first pressed product outlet. The pressed product can in particular be a tablet. The rotary press can accordingly be a rotary tablet press. The tablets can for example be pharmaceutical tablets.

[0009] The scraping channel can for example be configured in the shape of a sickle. The scraping channel can be provided above the die plate in a first section and radially outside the die plate in a second section. The scraping channel is fixed relative to the rotor, in particular relative to the die plate, so that the die plate rotates underneath the scraping channel during the operation of the rotary press. The scraping channel can be provided above the die plate at a small distance. The distance is in particular smaller than the thinnest pressed product to be produced in the rotary press, so that all pressed products are captured by the scraping channel. During the rotation of the die plate, the pressed products which are ejected onto the upper side of the die plate by the lower punch after the pressing process are scraped off the die plate by the scraping channel, in particular by the channel wall of the scraping channel, and transported in the direction of the first pressed product outlet. As explained, the first pressed product outlet can be for example a goods outlet for the pressed products which are identified as good products by a sensor of the rotary press.

[0010] According to the application, the section of the stripping channel arranged above the mold plate has a negative pressure device by means of which the pressed products on the mold plate are sucked along the stripping channel to the first pressed product outlet. That is to say, according to the application, the negative pressure device is integrated into the stripping channel and here in particular into the section of the stripping channel arranged above the mold plate. As a result, the negative pressure device is located close to the ejection position at which the pressed products are pushed by the lower pressing punch from the mold cavity onto the upper side of the mold plate. As a result, the pressed products are stabilized very early, in particular directly after leaving the respective mold cavity, by the air flow, in particular the air stream, generated by the negative pressure device and accelerated in the direction of the first pressed product outlet along the stripping channel. As a result, it is ensured that the pressed products are conveyed particularly reliably through the stripping channel and that jamming of the tablets is reliably avoided. At the same time, the negative pressure device is arranged in a compact and space-saving manner on the stripping channel or integrated into the stripping channel. Furthermore, since the negative pressure device is arranged on the stripping channel, it only has to act over a small distance compared to the case in which it is arranged in a goods channel downstream of the stripping channel, so that less pressure gas or pressure air is required for the operation of the negative pressure device and resources are saved.

[0011] According to one design it can be provided that the negative pressure device can be arranged on the section of the stripping channel arranged above the mold plate in such a way that the suction effect acting on the pressed product by the negative pressure device already occurs during the ejection of the pressed product from the mold cavity by the lower pressing punch. In this design, the negative pressure device is arranged on the stripping channel in such a way that the suction effect acting on the pressed product by the negative pressure device already occurs when the pressed product is still inside the respective mold cavity during the ejection process by the lower pressing punch. In this design, the suction effect generated by the negative pressure device superimposes and deflects the vertical acceleration of the pressed product out of the mold cavity achieved by the lower pressing punch and thereby stabilizes the movement of the pressed product. Blocking and mutual overtaking of the pressed products when being ejected from the mold cavity can be particularly reliably prevented.

[0012] According to one design it can be provided that the negative pressure device can be arranged on the section of the stripping channel arranged above the mold plate in such a way that the air flow generated by the negative pressure device flows over the pressed product being ejected from the mold cavity by the lower pressing punch. By arranging the negative pressure device on the section of the stripping channel arranged above the mold plate, particularly effective flow over the pressed product on the mold plate is achieved as a result of the suction effect generated by the negative pressure device. In addition to the suction force parallel to the bottom of the mold plate or the direction of the stripping channel towards the first pressed product outlet, this flow over also results in the occurrence of a force component oriented vertically upwards. By the combination of these forces acting on the pressed product, particularly uniform and smooth conveying of the pressed product over the surface is achieved.

[0013] According to another design it can be provided that the negative pressure device has a negative pressure nozzle integrated into a section of the outlet channel arranged above the mold plate. The desired suction effect can be generated by the negative pressure nozzle, preferably by a Venturi effect. The negative pressure nozzle can blow a pressure gas, for example pressure air, in the desired direction of movement of the press product in order to generate a negative pressure which transports the press product in this direction of movement. By the negative pressure nozzle a suction effect in the direction of movement of the press product is generated towards the first press product outlet. With this design an especially effective transport of the press product is achieved.

[0014] According to another design it can be provided that the negative pressure nozzle integrated into a section of the removal channel arranged above the mold plate is arranged above and / or adjacent to the ejection position of the press product when it is ejected from the mold cavity by the lower press ram. By arranging the negative pressure nozzle above and / or adjacent to the ejection position of the press product when it is ejected from the mold cavity, on the one hand the vertical acceleration of the press product during the ejection process is advantageously deflected and stabilized by the suction effect as described above. Furthermore, by arranging above and / or adjacent to the ejection position, compared to the prior art, the amount of pressure gas or pressure air required can be further reduced.

[0015] According to another design it can be provided that the removal channel has a first channel wall which guides the press product to the first press product outlet and a channel roof which at least partially covers the removal channel, and that a negative pressure nozzle is arranged in the first channel wall and in the channel roof. The removal channel can furthermore have a second channel wall which is opposite the first channel wall, and a negative pressure nozzle can also be arranged in the second channel wall. The first channel wall, the channel roof and the second channel wall can form a U-shaped profile. The first channel wall, the channel roof and the second channel wall can be configured in one piece or composed of multiple sections. By the described annular arrangement of the negative pressure nozzles around the front of the transport space for the press product defined by the removal channel, an especially uniform and effective suction effect on the press product in the direction of movement towards the press product outlet is achieved. Opposite the channel roof, the removal channel is open, in particular in the region of the section thereof arranged above the mold plate, so that the space defined by the removal channel is on the underside defined by the surface of the mold plate at least in the region of the section arranged above the mold plate. In contrast thereto, sections of the removal channel which are arranged radially outside the mold plate can have a channel bottom opposite the channel roof for guiding the press product.

[0016] According to a further design it can be provided that the negative pressure nozzles each have an elongated nozzle section which extends in the conveying direction of the pressed products towards the first pressed product outlet, and that the pressure gas, in particular pressure air, is guided through the elongated nozzle section by the negative pressure device. The elongated section can extend linearly or curvedly. In this way, the Venturi effect, which can be used for the suction effect as described above, is used particularly effectively.

[0017] According to a further design it can be provided that the negative pressure device has a pressure gas supply, in particular a pressure air supply, for supplying pressure gas, in particular pressure air, to the negative pressure nozzles, the pressure gas supply having a supply channel which leads from a pressure gas supply to the negative pressure nozzles along the scraping channel. The supply channel can be integrated into the scraping channel. These designs allow a particularly compact and space-saving construction in that the supply channel of the pressure gas supply extends parallel to the scraping channel or is integrated into the scraping channel.

[0018] According to a further design it can be provided that, in addition, a picking device is provided for picking the pressed products which are ejected from the mould cavity into a second pressed product outlet which is arranged upstream of the first pressed product outlet in the conveying direction of the pressed products, the picking device comprising a picking nozzle for picking the pressed products into the second pressed product outlet by means of pressure gas. The picking nozzle can likewise be supplied with pressure gas from the pressure gas supply, for example via the supply channel or a further supply channel. If a further supply channel is provided, this can likewise extend parallel to the scraping channel or be integrated into the scraping channel. The second pressed product outlet can be, for example, a reject outlet for rejected pressed products which are identified as such by a sensor of the rotary press, the second pressed product outlet being located upstream of the first pressed product outlet in the movement direction of the pressed products. When the picking device is not activated, the pressed products are conveyed through the scraping channel in the direction of the first pressed product outlet past the second pressed product outlet. In contrast, if a pressed product is identified as being rejected and is to be picked accordingly, the picking device is activated. Pressure gas, in particular pressure air, is impinged on the pressed product, in particular by means of the picking nozzle, transversely to the movement direction of the pressed product, so that the pressed product is deflected from its conveying path into the second pressed product outlet. The first pressed product outlet can lead, for example, to a goods outlet in order to further process the produced pressed products, while the second pressed product outlet can lead to a reject outlet for rejected pressed products. In the designs described above, the pressure gas supply which is originally required for the picking by means of the picking device can advantageously be used at the same time for the supply of the negative pressure device. This can further simplify the construction and achieve a further saving in space.

[0019] According to another design, the stripping channel can extend all the way to the knockout device. Thereby, the suction effect can be generated particularly close to the ejection position of the pressed product from the mold cavity. By the additional channel length of the stripping channel generated in this way, a negative pressure is generated in the channel and thereby also on the mold plate at the same time. In order to achieve a particularly compact design, the knockout nozzle can be integrated into the stripping channel.

[0020] According to another embodiment, a first detection device can be provided in the first pressed product outlet, which detects the pressed products guided through the first pressed product outlet, and / or a second detection device can be provided in the second pressed product outlet, which detects the pressed products guided through the second pressed product outlet. The pressed products manufactured in the rotary press are selectively introduced into the first or the second pressed product outlet, depending on whether the pressed products are identified as good or bad. As explained above, the second pressed product outlet can be a reject outlet for pressed products identified as bad by the sensors of the rotary press. The second pressed product outlet can in particular be the second pressed product outlet explained above, so that reference is made to the above explanations.

[0021] In the preceding embodiment, a first detection device can be provided in the first pressed product outlet, which detects the pressed products guided through the first pressed product outlet. Furthermore, a second detection device can be provided in the second pressed product outlet, which detects the pressed products guided through the second pressed product outlet. In the prior art, the detection of the ejected pressed products is carried out in particular by monitoring a pressure increase in the nozzle assembly for conveying the pressed products. For example, a clogging of the nozzle assembly can lead to false detection results. This problem is overcome according to the preceding embodiment. At the same time, a redundant detection of the ejected pressed products can be achieved.

[0022] By providing a detection device both in the first and in the second pressed product outlet, on the one hand, the ejected pressed products conveyed through the second pressed product outlet, which is realized for example as a reject channel, can be directly detected. On the other hand, in the flow of the pressed products discharged through the first pressed product outlet, which is realized for example as a good product channel, a gap corresponding to the ejected bad pressed product can be detected, and thereby the ejected pressed product can be indirectly detected. Thereby, a reliable redundant monitoring of the ejection of the pressed products is ensured. False detection results due to a clogging of the nozzle opening or the like can be eliminated.

[0023] As a detection device, for example, a light barrier, in particular a tubular light barrier, can be used. By means of the light barrier, a particularly reliable and precise identification of the pressed products and / or of a gap in the flow of the pressed products can be achieved. However, other sensors, for example capacitive sensors, can also be used for the detection device. BRIEF DESCRIPTION OF DRAWINGS

[0024] One embodiment of the application is explained in detail below with reference to the drawing. Therein is shown schematically:

[0025] Figure 1 a rotary press according to the application is shown with an exploded view of the rotor,

[0026] Figure 2 a part of a rotary press according to the application is shown with a perspective view, Figure 1

[0027] Figure 3 a top view of a wiping channel of a rotary press according to the application is shown,

[0028] Figure 4 a sectional view along the line B-B in Figure 3

[0029] a sectional view along the line C-C in Figure 3 Figure 5 Figure 3 a sectional view along the line C-C in Figure 5

[0030] Figure 6 a diagram for illustrating the flow sweep of tablets manufactured in a rotary press. DETAILED DESCRIPTION

[0031] In the figures, identical reference numerals designate identical items unless otherwise specified.

[0032] The rotary press according to the application shown in Figure 1 is a rotary press for manufacturing tablets and in this rotary press a powder material is pressed into tablets. The rotor of the rotary press is driven in rotation by a rotary drive and comprises a die disc 10 having a plurality of cavities 12. The cavities 12 can be formed for example by holes of the die disc 10. Furthermore, the rotor comprises a plurality of upper and lower pressing punches 14, 16 which are rotated in synchronism with the die disc 10. The upper pressing punches 14 are guided in axial direction in upper punch guides 18 and the lower pressing punches 16 are guided in axial direction in lower punch guides 20.

[0033] The axial movement of the upper and lower compression punches 14, 16 during the rotation of the rotor is controlled by the upper and lower control cam elements 22, 24. In addition, a filling device 26 is provided, which has a filling reservoir 28 and a filling chamber 30, which are connected by a filling tube 32. In this way, in the present example, the powder material enters from the filling reservoir 28 via the filling tube 32 into the filling chamber 30 due to the force of gravity and from there through a filling opening provided on the underside of the filling chamber 30 also due to the force of gravity into the mould cavities 12 of the mould plate 10.

[0034] The rotary press furthermore comprises a pressure device 34. The pressure device 34 comprises a pre-pressure device with an upper pre-pressure roller 36 held on an upper support 35 and a lower pre-pressure roller 38 held on a lower support 37 and a main pressure device with an upper pressure roller 40 held on an upper support 39 and a lower pressure roller 42 held on a lower support 41. In addition, the rotary press comprises a scraping device 44 with a scraping channel 46. The scraping channel scrapes the tablets 48 conveyed by the lower compression punch 16 onto the upper side of the mould plate 10 from the mould plate 10 and conveys the tablets 48 through the scraping channel 46 to the first press product outlet 58. The scraping channel 46 can be, for example, sickle-shaped and will be explained in detail in accordance with the following figures. In addition, the rotary press comprises a control device 52 for controlling the operation of the rotary press.

[0035] In Figure 2 for the sake of explanation, only the mould plate 10 with the mould cavities 12 and the scraping channel 46 of the scraping device 44 are shown in the rotary press shown in Figure 1 . The scraping channel 46 comprises a first section 54 arranged above the mould plate 10 and a second section 56 arranged radially outside the mould plate. The scraping channel 46 leads to the first press product outlet 58, through which tablets 48 identified as good products can be conducted from the rotary press for further processing. In operation, the mould plate 10 rotates anticlockwise, as shown by the arrow 60 in Figure 2 . Upstream of the first press product outlet 58 in the direction of rotation of the mould plate 10 and thus in the direction of conveyance of the tablets 48 into the scraping channel 46, a second press product outlet 62 is arranged, through which tablets 48 identified as rejects by a sensor of the rotary press can be supplied to a reject outlet for rejects.

[0036] Reference is made to Figures 3 to 5 The structure of the scraping device 44 according to the application is explained in detail. In Figure 4A supply channel 64 integrated into the stripping channel can be seen in the sectional view, which is connected to a not shown pressure supply of a pressure gas supply device, through which the negative pressure nozzles integrated into the stripping channel 46 of the negative pressure device are supplied with pressure gas, in particular pressure air. In the example shown, pressure air as pressure gas is supplied to the U-shaped section 68 of the stripping channel 46 via a lateral connection 66 from the supply channel 64, which runs parallel to the transport path of the tablets 48 through the stripping channel 46. The U-shaped section 68 is formed by a first channel wall 70, a second channel wall 72 and a channel roof 74. As can in particular be seen in Figure 5 The section 68 opens into a plurality of negative pressure nozzles 76 arranged along a likewise U-shaped profile. The pressure air supplied through the supply channel 64 is guided through the U-shaped section 68 to the negative pressure nozzles 76 and blown out of the negative pressure nozzles in the desired direction of movement of the tablets 48 transported through the stripping channel 46. Thereby, in the present example during the ejection process, already while the tablets 48 are still at least partially in the mold cavity 12, a suction effect acting on the tablets 48 ejected from the mold cavity 12 by the downward pressing punch 16 is already formed. As is further shown in Figure 5 The stripping channel 46 has an exit ramp section 78 as a channel floor in its section radially outside the mold disc 10, via which the tablets 48 transported by the suction effect of the negative pressure device reach the first pressing product outlet 58 due to the force of gravity. It can also be seen in Figure 5 It can also be seen in that a plurality of negative pressure nozzles 76 is arranged in the first channel wall 70 and in the second channel wall 72 and in the channel roof 74, respectively. These negative pressure nozzles 76 can each have an elongated nozzle section extending in the direction of transport of the tablets 48 towards the first pressing product outlet 58, through which the pressure gas or pressure air is guided. In contrast, in the section 54 arranged above the mold disc 10, the stripping channel 46 has no floor, so that the space defined by the first and second channel walls 70, 72 and the channel roof 74 is formed on its underside by the mold disc 10 rotating underneath the stripping channel 46.

[0037] Furthermore, a supply channel 64 is also integrated into the stripping channel 46, which is obscured in Figure 4 and 5 and in Figure 3A picking nozzle 80, which is part of a picking device for picking tablets 48 identified as defective, for example by a sensor of a rotary press, into a second press product outlet 62, is indicated schematically. A further supply channel 82, which is likewise integrated into the wiping channel 46, is connected to a pressure gas supply and supplies the picking nozzle 80 with pressure gas, in particular pressure air. By means of a short pressure gas impulse applied by the picking nozzle 80, a tablet 48 identified as defective can be blown out of its transport path into the second press product outlet 62 in a targeted manner. As is shown in the figures, the wiping channel 46 extends as far as the picking device, in particular the picking nozzle 80. As mentioned above, the picking nozzle 80 is integrated in particular into the wiping channel 46.

[0038] As mentioned above, it is ensured by means of the negative pressure device according to the application, in particular the negative pressure nozzle 76, that the suction effect acting on the tablet 48 already occurs during the ejection of the tablet 48 from the mold cavity 12 by the lower press punch 16. Furthermore, it is ensured by means of this design of the negative pressure device, in particular by means of this arrangement of the negative pressure nozzle 76, that the air flow generated by the negative pressure nozzle 76 flows over the tablet 48 that is ejected from the mold cavity 12 by the lower press punch 16 and that is on the mold plate 10.

[0039] In Figure 6 The flow-over of the tablet 48 by the air flow 84 is indicated schematically in Fig. 10. By such a flow-over, there are two force components acting on the tablet 48, namely on the one hand a force component in the desired movement direction of the tablet 48, as is indicated by the arrow 86, and on the other hand a vertically upward force component, as is indicated by the arrow 88. In this way, it is ensured that the tablet 48 is conveyed particularly reliably.

[0040] List of reference signs

[0041] 10 mold plate

[0042] 12 mold cavity

[0043] 14 upper press punch

[0044] 16 lower press punch

[0045] 18 upper punch guide

[0046] 20 lower punch guide

[0047] 22 upper control cam element

[0048] 24 lower control cam element

[0049] 26 filling device

[0050] 28 filling reservoir

[0051] 30 filling chamber

[0052] 32 filling tube

[0053] 34 pressure device

[0054] 35, 39 upper support

[0055] 37, 41 lower support

[0056] 36 upper pre-pressure roller

[0057] 38 lower pre-pressure roller

[0058] 40 upper pressure roller

[0059] 42 lower pressure roller

[0060] 44 scraping device

[0061] 46 scraping channel

[0062] 48 tablet, press product

[0063] 52 control device

[0064] 54 first section

[0065] 56 second section

[0066] 60 arrow

[0067] 62 second press product outlet

[0068] 64 supply channel

[0069] 66 transverse connection

[0070] 68 section

[0071] 70 first channel wall

[0072] 72 second channel wall

[0073] 74 channel roof

[0074] 76 negative pressure nozzle

[0075] 78 discharge chute section

[0076] 80 picking nozzle

[0077] 82 supply channel

[0078] 84 air flow

[0079] 86 arrow

[0080] 88 arrow

Claims

1. Rotary press comprising a rotor which is rotatable by means of a rotary drive, the rotor having an upper punch guide (18) for an upper pressing punch (14) and a lower punch guide (20) for a lower pressing punch (16) and a die disc (10) which is arranged between the upper punch guide (18) and the lower punch guide (20), the pressing punches (14, 16) cooperating with a cavity (12) of the die disc (10), the rotary press furthermore comprising a filling device (26) by means of which a powder material to be pressed is filled into the cavity (12) of the die disc (10), and the rotary press comprising a pressure device (34) having an upper pressure unit (40) and a lower pressure unit (42), which in operation cooperate with the upper pressing punch (14) and with the lower pressing punch (16) in order to press the powder material in the cavity (12) of the die disc (10) into a pressed product (48), and the rotary press comprising a stripping device (44) for stripping the pressed product (48) which after pressing is ejected by the lower pressing punch (16) onto the upper side of the die disc (10), the stripping device (44) having a stripping channel (46) which is arranged at least partially above the die disc (10), so that the pressed product (48) which is ejected by the lower pressing punch (16) from the cavity (12) onto the upper side of the die disc (10) is guided from the die disc (10) along the stripping channel (46) to a first pressed product outlet (58), characterized in that The section (54) of the stripping channel (46) arranged above the mold plate (10) has a negative pressure device by which the pressed product (48) on the mold plate (10) is sucked along the stripping channel (46) to the first pressed product outlet (58).

2. The rotary press of claim 1, wherein The negative pressure device is arranged on the section (54) of the stripping channel (46) arranged above the mold plate (10) in such a way that the suction effect by the negative pressure device on the pressed product (48) already occurs during the ejection of the pressed product (48) from the mold cavity (12) by the lower pressing punch (16).

3. Rotary press according to any of the preceding claims, characterized in that The negative pressure device is arranged on the section (54) of the stripping channel (46) arranged above the mold plate (10) in such a way that the air flow (84) generated by the negative pressure device flows over the pressed product (48) being ejected from the mold cavity (12) by the lower pressing punch (16).

4. Rotary press according to any of the preceding claims, characterized in that The negative pressure device has negative pressure nozzles (76) integrated into the section (54) of the stripping channel (46) arranged above the mold plate (10).

5. The rotary press of claim 4, wherein, The negative pressure nozzles (76) integrated into the section (54) of the stripping channel (46) arranged above the mold plate (10) are arranged above and / or adjacent to the ejection position of the pressed product (48) when being ejected from the mold cavity (12) by the lower pressing punch (16).

6. The rotary press according to any one of claims 4 or 5, characterized in that The stripping channel (46) has a first channel wall (70) guiding the pressed product (48) to the first pressed product outlet (58) and a channel roof (74) at least partially covering the stripping channel (46), and the negative pressure nozzles (76) are arranged in the first channel wall (70) and in the channel roof (74).

7. The rotary press of claim 6, wherein, The stripping channel (46) furthermore has a second channel wall (72) opposite the first channel wall (70), and the negative pressure nozzles (76) are also arranged in the second channel wall (72).

8. The rotary press of claim 7, wherein, The first channel wall (70), the channel roof (74) and the second channel wall (72) form a U-shaped profile.

9. The rotary press according to any one of claims 4 to 8, characterized in that The negative pressure nozzles (76) each have an elongated nozzle section extending in the conveying direction of the pressed product (48) towards the first pressed product outlet (58), and the negative pressure device directs pressure gas, in particular pressure air, through the elongated nozzle sections.

10. The rotary press according to any one of claims 4 to 9, characterized in that The negative pressure device has a pressure gas supply, in particular a pressure air supply, for supplying pressure gas, in particular pressure air, to the negative pressure nozzles (76), the pressure gas supply having a supply channel (64) leading from a pressure gas supply to the negative pressure nozzles (76) along the stripping channel (46).

11. The rotary press of claim 10 wherein, The supply channel (64) is integrated into the stripping channel (46).

12. Rotary press according to any of the preceding claims, characterized in that Furthermore, there is provided an ejecting device for ejecting the pressed product (48) being ejected from the mold cavity (12) into a second pressed product outlet (62) arranged upstream of the first pressed product outlet (58) in the conveying direction of the pressed product (48), the ejecting device comprising an ejecting nozzle (80) for ejecting the pressed product (48) into the second pressed product outlet (58) by pressure gas.

13. The rotary press according to claim 12 and either of claims 10 or 11, characterized in that, The picking nozzle (80) is likewise supplied with pressure gas by means of a pressure gas supply.

14. The rotary press according to any one of claims 12 or 13, characterized in that The stripping channel (46) extends up to the picking device.

15. The rotary press according to any one of claims 12 or 14, characterized in that The picking nozzle (80) is integrated into the stripping channel (46).

16. Rotary press according to any of the preceding claims, characterized in that A first detection device is provided in the first press product outlet (58), which detects the press products (48) that are guided through the first press product outlet (58), and / or a second detection device is provided in the second press product outlet (58), which detects the press products (48) that are guided through the second press product outlet (58).

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