SAFETY RAIL FOR A ROTARY PRESS

Abstract

A rotary press comprising at least one pressing station having each of a vertically-adjustable upper and lower pressure roller, which are mounted by axes in the at least one pressing station. Cam-guided upper punches having punch heads are fed to the upper pressure roller by a control cam and a pull-up cam raises the upper punches to a highest point above a filling device. A vertically-adjustable safety cam is designed to be vertically adjustable in relation to the upper pressure roller. The rotary press may comprise a preliminary pressure cam, which is integrated in a guide block.

Claims

1. A rotary press comprising: at least one pressing station including a vertically-adjustable upper pressure roller and a vertically-adjustable lower pressure roller, each of the upper pressure roller and the lower pressure roller being mounted on an axis in the at least one pressing station, wherein cam-guided upper punches having punch heads are fed to the upper pressure roller using a control cam and a pull-up cam raises the upper punches to a highest point above a filling device, wherein a safety cam is provided in the at least one pressing station below the upper pressure roller, the safety cam, being arranged vertically adjustable in relation to the upper pressure roller.

2. The rotary press as claimed in claim 1, wherein the vertically-adjustable safety cam has a minimum distance of 0.09 to 0.11 mm to the punch heads of the upper punches during a passage of the upper punches along a bottom dead center of the upper pressure roller.

3. The rotary press as claimed in claim 1, wherein the safety cam is connected to the axis of the upper pressure roller with a connector.

4. The rotary press as claimed in claim 1, wherein the adjustment of the safety cam in relation to the upper pressure roller is performed manually and/or automatically.

5. The rotary press as claimed in claim 3, wherein the connector has a hole, which is applied to a flanged bushing, wherein the flanged bushing is attached to a rear end face of the axis of the upper pressure roller.

6. The rotary press as claimed in claim 3, wherein the connector is attached and/or guided by recesses in rear sides of a pull-down cam and a pull-up cam on an upper cam sequence.

7. The rotary press as claimed in claim 1, wherein the at least one pressing station is a preliminary pressure station having a vertically-adjustable upper preliminary pressure roller and a vertically-adjustable lower preliminary pressure roller, and wherein a closed preliminary pressure cam is arranged in the upper cam sequence of the at least one preliminary pressure station, which includes multiple cam elements.

8. The rotary press as claimed in claim 7, the closed preliminary pressure cam forms a lower region of a guide block, which is integrated into the upper cam sequence of the at least one preliminary pressure station.

9. The rotary press as claimed in claim 8, the guide block includes a front side, a rear side, and lateral surfaces, the front side and the rear side of the guide block have a uniform curve outward, wherein the curve of the front and rear sides of the guide block reproduces a circular footprint of a rotor of the rotary press.

10. The rotary press as claimed in claim 8, the guide block includes a receptacle hole for the upper preliminary pressure roller.

11. The rotary press as claimed in claim 90, wherein the lateral surfaces of the guide block are rounded, wherein the rounded lateral surfaces engage in counter roundings of the adjoining cam elements in the upper cam sequence of the at least one preliminary pressure station at the guide block.

12. The rotary press as claimed in claim 2, wherein the vertically-adjustable safety cam has a minimum distance of 0.1 mm to the punch heads of the upper punches during a passage of the upper punches along the bottom dead center of the upper pressure roller.

Description

[0051] The invention will be described in greater detail with the aid of exemplary embodiments and the following figures; in the figures:

[0052] FIG. 1 shows a view of a preferred embodiment of the upper cam sequence of a rotary press having preliminary pressure and main pressure stations and safety rail

[0053] FIG. 2 shows a view of a preferred embodiment of the upper cam sequence with rear view of the preliminary pressure and main pressure stations

[0054] FIG. 3 shows a view of a preferred embodiment of the safety rail

[0055] FIG. 4 shows a front view of a preferred embodiment of the guide block as an individual part having integrated pressing-on cam

[0056] FIG. 5 shows a possible installation situation of a preferred embodiment of the guide block in a rotary press

[0057] FIG. 1 shows a view of one preferred embodiment of the upper cam sequence (1) of a rotary press having preliminary pressure and main pressure stations and safety rail (7), in particular a view from a 10 o'clock position of the upper cam carrier (1) of a rotary press is shown. The cam sequence (1) is preferably formed, inter alia, by transfer rails (12, 13), which are used for fastening and accommodating further stations and the fasteners thereof, for example, screws. The preliminary pressure station comprises a preliminary pressure roller (3), which comprises a vertical adjustment (5), a transfer rail (6) to the main pressure roller (2), and a safety rail (7) having a mount (8) for the safety rail (7). It is preferable that the transfer rail (6) ensures the transition between preliminary pressure region and safety cam (7). A preliminary pressure of the tablet material to be compressed can advantageously be carried out in this preliminary pressure station. In the region of the preliminary pressure roller (3), the cam carrier (1) preferably comprises preliminary pressure rails, which are preferably formed by a pull-down rail (15) and a transfer rail (6). Following counterclockwise, the cam sequence (1) comprises a main pressure station having main pressure roller (2), using which the actual production of the tablet is performed. The main pressure roller (2) is preferably fastened using a pressure roller pin (9) on the pressure roller receptacle of a pressure roller station of the rotary press. A safety rail (7), which is preferably also referred to as a safety cam, is preferably provided below the main pressure roller (2). It is preferably fastened on the cam sequence (1) using a mount (8), wherein the mount (8) comprises a flanged bushing (10) having a hole (19). It is preferable that the safety rail (7) is connected in a simple manner via the flanged bushing (10) and the mount (8) to the pressure roller axis (4). The safety rail (7) is preferably located below the upper main pressure roller (2), preferably in the inner region of the cam sequence (1) behind the outer transfer rail (6) and the pull-up cam (11) (shown by dashed lines). The safety rail (7) is advantageously fastened on the mount (8) using the screws (17.1 and 17.2). It is preferable in particular that the safety cam (7) is provided connected by means of a connector (8), which is also referred to as a mount in the meaning of the invention, to the axis (4) of the upper pressure roller (2). At the upper end of the mount (8), a through hole (19) is located, into which the flanged bushing (10) protrudes, which is in turn fastened in the end face of the pressure roller pin (9) in a pocket hole.

[0058] The upper main pressure roller (2) can be adjusted in the height manually or automatically, whereby different plunging depths result for the upper punches (18) within the die hole. Due to the coupling of the safety rail (7) to the axis (4) of the main pressure roller (2), which can preferably be formed by a roller pin (4) of the main pressure roller (2), upon an adjustment of the position of the upper main pressure roller (2), the height position of the safety rail (7) is advantageously also changed automatically and synchronously. It is preferable that the safety rail (7) is located 0.1 mm plus the height of the punch head below the bottom dead center of the upper main pressure roller (2). This advantageously means that the upper punches (18) can never plunge more than 0.1 mm deeper beyond the set pressure roller position into the die.

[0059] The transfer rails (6 and 11), which are preferably also referred to as outer guide cams, are preferably adapted to the maximum permissible plunging depth of the rotary press. As long as the upper main pressure roller (2) is set to a lesser plunging depth than the maximum plunging depth during the tablet production, the upper punch heads will not touch the outer safety rails because of the inner safety cam (7). This represents an essential advantage of the invention with regard to the operational reliability of the rotary press.

[0060] It is preferable that the upper punches (18, not shown) are guided through below the pressure roller (2), wherein they are pressed downward by the passage below the pressure roller (2), wherein the tablets are pressed by interaction with the lower punches in the die holes. It is preferable that the safety cam (7), when observed, is provided arranged below the main pressure roller (3).

[0061] It is preferable that the preliminary pressure roller (3) is not equipped with a safety cam (7), since the guide rails in the region below the preliminary pressure rails do not permit greater plunging depths of the upper cams. In addition, screws (16.1 and 16.2) are shown in FIG. 1 as possible fasteners, which interact with a pull-up cam (11) of the main pressure cam (2) shown by dashed lines, which is preferably provided arranged between safety cam (7) and transfer rail (12). Furthermore, a connection (14) for a multifunction plug is visible.

[0062] FIG. 2 shows a view of a preferred embodiment of the upper cam sequence (1) with rear view of the preliminary pressure and main pressure stations. The preliminary pressure roller (3) and the main pressure roller (2) are shown, wherein the vertical adjustment (5) is also visible with respect to the preliminary pressure roller (3). Observed from the front, i.e., from the outside, the pull-down cam (15) of the preliminary pressure roller (3) is arranged on the left side of the preliminary pressure roller (3), while the transfer rail (6) to the safety cam (7) is provided arranged on the right side observed from the front.

[0063] The safety cam (7) (not shown in FIG. 2) is arranged below the main pressure roller (2). It preferably has a mount (8), which is fastened using the fasteners (17.1 and 17.2), for example, screws, on the upper cam sequence (1). A flanged pushing (10) having a drilled hole (19) is preferably located in an opening in the upper, preferably rounded region of the mount (8) of the safety rail (7). It is particularly preferable if the transfer rail (6) and the pull-up cam (11) have rear recesses, which advantageously ensure a radial guide of the mount (8) of the safety rail (7). It is preferable that the upper punches (18, not shown here) can be guided in a region between the pull-up cam (11) of the main pressure roller (2) and the transfer rail (12) of the cam sequence (1). The pull-up cam (11) is fastened using fasteners (16.1 and 16.2), for example, screws, on the cam sequence (1).

[0064] FIG. 3 shows a view of a preferred embodiment of the safety rail (7). This is advantageously fastened using the screws (17.1 and 17.2) on the mount (8), is provided arranged behind the main pressure roller (2) observed from the outside and comprises an opening for accommodating a flanged bushing (10) in an upper region. The preliminary pressure station having preliminary pressure roller (3), which preferably does not have a safety rail (7), is preferably arranged clockwise from the outside. The preliminary pressure roller (3) is preferably designed to be vertically adjustable by means of a vertical adjustment (5). The reference sign 4 identifies the axis of the main pressure roller (2).

[0065] FIG. 4 shows a front view of a preferred embodiment of the guide block (20) as an individual part having integrated pressing-on cam (22, 23, 24) and a receptacle hole (21) for the upper pressing-on roller (28, not shown). The integrated pressing-on cam is preferably formed by a pressing-on rail in the pull-down (22) region, a pressing-on rail in the safety rail (23) region, and a pressing-on rail in the pull-up (24) region, wherein the pressing-on rail forms a left region of the integrated pressing-on cam observed from the outside in the pull-down (22) region, the pressing-on rail forms a right region of the integrated pressing-on cam in the pull-up (24) region, and the pressing-on rail forms a middle region of the integrated pressing-on cam in the safety rail (23) region. The pressing-on rail is preferably arranged lower or deeper in the safety rail (23) region in comparison to the pressing-on rails in the pull-down (22) region and the pressing-on rails in the pull-up (24) region, which results from the pull-down and the pull-up function of the corresponding rails (22 and 24). It is particularly preferable if the guide block (20) comprises the integrated pressing-on rail (22, 23, 24) and it is provided integrated into the guide block (20). It is furthermore preferable that the integrated pressing-on rail (22, 23, 24) is referred to as a closed preliminary pressure cam in terms of the invention.

[0066] The receptacle hole (21) is preferably also referred to as a receptacle of the preliminary pressure roller (3) or as a preliminary pressure roller receptacle. It is preferable in terms of the invention that the adjustable pressing-on rail (22, 23, 24) is installed with the guide block (20) inside the rotary press and the first pressing-on station is located on the upper preliminary pressure roller (28). The first pressing-on station can preferably be, for example, a tamping station. The lateral semicircular guides (25), which are preferably formed as round guides, are preferably located on the right and left sides of an upper region of the illustrated preferred embodiment of the guide block (20) observed from the outside.

[0067] FIG. 5 shows a possible installation situation of a preferred embodiment of the guide block (20) in a rotary press. The arrangement of the guide block (20) in relation to the upper preliminary pressure station (28) and the pressure roller pin (9) is shown. The guide block (20) preferably has a round guide (25) in the upper region. Furthermore, upper punches (32) and the guide heads thereof are shown, which interact with the pressure rollers in such a way that the upper punches (32) are pressed downward upon passage below the pressure rollers to mold the tablets or to effectuate a preliminary pressure in cooperation with the lower punches in the die holes.

LIST OF REFERENCE SIGNS

[0068] 1 upper cam sequence of a rotary press

[0069] 2 upper main pressure roller

[0070] 3 preliminary pressure roller without safety rail

[0071] 4 axis of main pressure roller

[0072] 5 vertical adjustment of preliminary pressure roller

[0073] 6 transfer rail preliminary pressure rollersafety rail

[0074] 7 safety rail

[0075] 8 mount of safety rail

[0076] 9 end face of pressure roller pin

[0077] 10 flanged bushing

[0078] 11 pull-up cam

[0079] 12 transfer rail

[0080] 13 transfer rail

[0081] 14 connection for multi-function plug

[0082] 15 pull-down cam on the left side of the preliminary pressure roller

[0083] 16.1 screw

[0084] 16.2 screw

[0085] 17.1 screw

[0086] 17.2 screw

[0087] 18 upper punch

[0088] 19 hole

[0089] 20 guide block

[0090] 21 preliminary pressure roller receptacle

[0091] 22 pressing-on rail in the pull-down region

[0092] 23 pressing-on rail in the safety rail region

[0093] 24 pressing-on rail in the pull-up region

[0094] 25 round guide

[0095] 28 upper preliminary pressure station