DYNAMIC MIXER FOR USER-FRIENDLY INSERTION INTO A MIXING APPARATUS

Abstract

The invention relates to a method (100) for congruent alignment of a first polygonal multi-edge geometry (2) of a rotor shaft (3) of a dynamic mixer (4) with a second polygonal multi-edge geometry (5) of a drive shaft (6) of a motor (7) of a mixing apparatus (8), and optionally insertion of the second polygonal multi-edge geometry (5) of the drive shaft (6) of the motor (7) of the mixing apparatus (8) into or onto the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4), as well as a dynamic mixer for use in the method as also use of the mixer in the method.

Claims

1. Method (100) for congruent alignment of a first polygonal multi-edge geometry (2) of a rotor shaft (3) of a dynamic mixer (4), in particular of a dental dynamic mixer, with a second polygonal multi-edge geometry (5) of a drive shaft (6) of a motor (7) of a mixing apparatus (8), and optionally insertion of the second polygonal multi-edge geometry (5) of the drive shaft (6) of the motor (7) of the mixing apparatus (8) into or onto the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4), the method comprising a step selected from: a) providing a dynamic mixer (4) the first polygonal multi-edge geometry (2) of the rotor shaft (3) being in a first defined rotational position, and positioning the dynamic mixer (4) in the mixing apparatus (8), the second polygonal multi-edge geometry (5) of the drive shaft (6) of the motor (7) of the mixing apparatus (8) being in the second defined rotational position, or being transferred from a second starting rotation position into a second defined rotational position, or b) transferring the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) being positioned in the mixing apparatus from a first starting rotational position in a first defined rotational position, and/or c) transferring the second polygonal multi-edge geometry (5) of the drive shaft of the motor (7) of the mixing apparatus from a second starting rotational position in a second defined rotational position; wherein, after positioning a) the dynamic mixer (4) in the mixing apparatus, the first defined rotational position is congruently aligned with the second rotational position, or wherein, after positioning the dynamic mixer (4) in the mixing apparatus (8) and performing one of the two steps b) or c) or both steps b) and c), the first defined rotational position is congruently aligned with the second rotational position, wherein b) transferring the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) from the first starting rotational position into the first defined rotational position is carried out manually or automatically, wherein i) an orientation template having a third polygonal multi-edge geometry is used when manually transferring the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4), and ii) means for optical marking arranged at the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer are recognized by an optical sensor of the mixing apparatus to identify a respective rotational position of the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) when automatically transferring the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) from the first starting rotational position in the first defined rotational position, wherein congruent alignment of the first defined rotational position of the rotor shaft (3) of the dynamic mixer (4) with the second defined rotational position of the drive shaft (6) of the motor (7) of the mixing apparatus (8) of step b) comprises: sliding the second polygonal multi-edge geometry (5) of the drive shaft (6) of the motor of the mixing apparatus into or onto the first polygonal multi-edge geometry of the rotor shaft of the dynamic mixer (110), the second polygonal multi-edge geometry of the drive shaft of the motor of the mixing apparatus being in a defined rotational position, wherein driving the drive shaft of the motor (7) of the mixing apparatus (8) into the pre-defined rotational position (101) is carried out by a control function of the mixing apparatus (8), wherein the pre-defined rotational position of the drive shaft (6) of the motor (7) of the mixing apparatus (8) has been fixed (103), the second polygonal multi-edge geometry (5) of the drive shaft (6) of the motor (7) in the pre-defined rotational position being substantially congruent to the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) in the defined rotational position, or wherein d) the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) is in a first starting rotational position, wherein means for optical marking are arranged at the first polygonal multi-edge geometry (2) of the rotor shaft (3) or at the rotor shaft (3) of the dynamic mixer, which being recognized by an optical sensor of the mixing apparatus (8), to identify a respective rotational position of the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4), and transferring the second polygonal multi-edge geometry (5) of the drive shaft of the motor (7) of the mixing apparatus from a second starting rotational position in the aforementioned respective rotational position of the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4), so that the second polygonal multi-edge geometry (5) of the drive shaft of the motor (7) of the mixing apparatus and the first polygonal multi-edge geometry (2) of the rotor shaft (3) being congruently aligned in the respective rotational position of the multi-edge geometry (2), wherein the means for optical marking comprise braille, a reflector and/or a 3D code.

2. Method according to claim 1, the method comprising: automatic congruent alignment of the second defined rotational position of the drive shaft (6) of the motor (7) of the mixing apparatus (8) at a first identified rotational position of the rotor shaft (3) of the dynamic mixer (4), wherein an identification of the first identified rotational position of the rotor shaft (3) of the dynamic mixer (4) comprises a recognition of the means for optical marking being arranged at the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) by the optical sensor of the mixing apparatus (8), wherein a first information concerning the first identified rotational position of the rotor shaft (3) of the dynamic mixer (4) is generated by the optical sensor, the first information being transmitted to a control electronics of the drive shaft (6) of the motor (7) of the mixing apparatus (8), wherein the control electronics uses the first information to drive the drive shaft (6) of the motor (7) of the mixing apparatus (8) in a rotational position being congruent to the first identified rotational position.

3. Method (100) according to claim 1, the method, when manually transferring the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) from the first starting rotational position in the first defined rotational position, comprises the steps of: sliding the third polygonal multi-edge geometry (9) of the orientation template (1) into or onto/around the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) (104), the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) initially being in an arbitrary rotational position; turning the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) on its own axis by means of the third polygonal multi-edge geometry (9) of the orientation template (1) into a defined rotational position (106), until the at least one circular arc-shaped stop element (10) encompasses in a positive-locking manner at least one inlet nozzle (11) of the dynamic mixer (4); removing the orientation template (1) from the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) (108), the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) being in the defined rotational position, the defined rotational position remaining fixed; and optionally inserting the second polygonal multi-edge geometry (5) of the drive shaft (6) of the motor (7) of the mixing apparatus (8) into or onto the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4).

4. Method (100) according to claim 1, wherein the first polygonal multi-edge geometry (2) is a first hexagonal geometry, the second polygonal multi-edge geometry (5) is a second hexagonal geometry, and the third polygonal multi-edge geometry (9) is a third hexagonal geometry.

5. Method according to claim 1, wherein second edges (14) of the second polygonal multi-edge geometry of the drive shaft of the motor (7) and first edges (15) of the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) are substantially arranged in a plane-parallel manner in the pre-defined rotational position of the second polygonal multi-edge geometry (5) of the drive shaft (6) of the motor (7) and in the defined rotational position of the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4).

6. Method according to claim 5, wherein first edges (15) corresponding to the second edges (14) and second edges (14) corresponding to the first edges (15) span a rectangle (16) due to the plane-parallelism respectively.

7. Method according to claim 6, wherein a tolerance deviation of the plane-parallelism is permissible, the tolerance deviation being measured in an angle deviation of the spanned rectangle (16) from its position in plane-parallelism, and being 7.5 degree at most.

8. Method according to any claim 1, wherein the mixing apparatus (8) comprises a cartridge (12) having at least two cartridge bodies (13) to receive at least two 2K compositions, in particular two 2K dental materials, the drive shaft (6) of the motor (7) of the mixing apparatus (8) being arranged between the at least two cartridge bodies (13).

9. Method according to claim 1, wherein the method comprises prior to step B) the step of: providing an orientation template (1), the orientation template (1) having a third polygonal multi-edge geometry (9) and at least one circular arc-shaped stop element (10).

10. Method according to claim 1, wherein the loosening torque of the rotor (30) of the dynamic mixer (4) is greater than or equal to 12 Ncm.

11. Method according to claim 1, wherein the rotor shaft (3) of the dynamic mixer (4) and the drive shaft (6) of the motor (7) are free from additional guiding structures and/or guiding sections, the first polygonal multi-edge geometry 82) of the rotor shaft (3) and the second polygonal multi-edge geometry (5) of the drive shaft (6) being absolutely sufficient for their common congruent and/or coaxial alignment prior to commissioning of the dynamic mixer (4), and optionally for their congruent and/or coaxial guiding during the mixing process of the dynamic mixer (4).

12. Orientation template (1) for congruent and coaxial alignment of a first polygonal multi-edge geometry (2) of a rotor shaft (2) of a dynamic mixer (4) with a second polygonal multi-edge geometry (5) of a drive shaft (6) of a motor (7) of a mixing apparatus (8), the orientation template (1) having a third polygonal multi-edge geometry (9) and at least one circular arc-shaped stop element (10), the third polygonal multi-edge geometry (9) being adapted to rotate the rotor shaft (3) of the dynamic mixer (4), the at least one circular arc-shaped stop element (10) being adapted to encompass in a positive-locking manner an inlet nozzle (11) of the dynamic mixer (4) in a defined rotational position of the orientation template (1) in relation to the rotor shaft (3) of the dynamic mixer (4).

13. Orientation template according to claim 12, wherein the first polygonal multi-edge geometry (2) is a first hexagonal geometry, the second polygonal multi-edge geometry (5) is a second hexagonal geometry, and the third polygonal multi-edge geometry (9) is a third hexagonal geometry.

14. Mixing apparatus (8) comprising a motor (7) having a drive shaft; a first receiving fixture to receive a cartridge (12) having at least two cartridge bodies (13) to receive at least two dental materials; and a second receiving fixture to receive a dynamic mixer (4) having rotor and rotor shaft, the drive shaft (6) being adapted to drive the rotor shaft (3); the rotor shaft (3) of the dynamic mixer (4) comprising a first polygonal multi-edge geometry (2), the drive shaft (6) of the mixing apparatus (8) comprising a second polygonal multi-edge geometry (5), the second polygonal multi-edge geometry (5) at pre-defined rotational position being congruently insertable into or onto the first polygonal multi-edge geometry (2) at defined rotational position, wherein the second polygonal multi-edge geometry (5) of the drive shaft (6) of the motor (7) is transferable into the pre-defined rotational position by a control function of the motor (7), and/or the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) is transferable into the defined rotational position by means of a third polygonal multi-edge geometry (9) of an orientation template (1).

15. Mixing apparatus (8) according to claim 14, wherein second edges (14) of the second polygonal multi-edge geometry (5) of the drive shaft (6) of the motor (7) and first edges (15) of the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4) are substantially arranged in a plane-parallel manner in the pre-defined rotational position of the second polygonal multi-edge geometry (5) of the drive shaft (6) of the motor (7) and in the defined rotational position of the first polygonal multi-edge geometry (2) of the rotor shaft (3) of the dynamic mixer (4).

16. Mixing apparatus (8) according to claim 14, wherein first edges (15) corresponding to the second edges (14) and second edges (14) corresponding to the first edges (15) span a rectangle (16) due to the plane-parallelism respectively.

17. Mixing apparatus (8) according to claim 16, wherein a tolerance deviation of the plane-parallelism is permissible, the tolerance deviation being measured in an angle deviation of the spanned rectangle (16) from its position in plane-parallelism, and being 7.5 degree at most.

18. Mixing apparatus according to claim 14 with an optical sensor, wherein the optical sensor is arranged in the mixing apparatus (8), the optical sensor being adapted to identify optical markings on a rotor shaft (3) of a rotor (30) of a dynamic mixer (4), wherein different positions of the optical markings correspond to different rotational positions of a multi-edge geometry of the rotor shaft (3) of the rotor (30) of the dynamic mixer (4).

19. Dynamic mixer (4), in particular for dental materials having different viscosity, wherein the dynamic mixer (1) comprises: a chamber part (22) being largely cylindrical at least in part, having a discharge opening (23) at the front end of the chamber part (22), the chamber part (2) comprising a mixing chamber (24), and a closing part (25) arranged at the back end of the chamber part (22), having a first and second inlet opening (26, 27) for single components to be inserted, as well as a centrical opening (28) for a rotor shaft (3) of a rotor (30) being rotatable about its longitudinal axis in the chamber part (22), the chamber part (22) and the closing part (25) being mounted against each other in a rotationally symmetric manner to the rotor shaft (3), the closing part (25) having at least two substantially parallel planes (31, 32) at the side averting the rotor tip that are axially put in a row, the plane (31) averting the rotor (30) comprising the first and the second inlet opening (26, 27), the plane (32) facing the rotor (30) having a first and a second passage opening (33, 34) to the mixing chamber (4), the first inlet opening (26) and the first passage opening (33) forming a linear duct (38), the at least two substantially parallel planes (31, 32) axially put in a row forming a feeding duct (35) between the second inlet opening (27) and the second passage opening (34) to the mixing chamber, the feeding duct (35) extending on an inner partial circle of the closing part (25), the rotor shaft (3) having a first polygonal multi-edge geometry as cross section profile, i) the polygonal multi-edge geometry of the rotor shaft being aligned in the first rotational position and, in particular, fixed in the first rotational position, preferably detachably anchored, ii) the polygonal multi-edge geometry of the rotor shaft being detachably fixed and initially aligned in the first rotational position by means of an orientation template or a tag, and/or iii) the first polygonal multi-edge geometry having means for optical marking of a rotational position of the polygonal multi-edge geometry, in particular the means for optical marking comprising braille, a reflector and/or a 3D code, the means for optical marking being suited to be recognized by an optical sensor.

20. Kit comprising a dynamic mixer (4) according to claim 19 and an orientation template (1) for congruent and coaxial alignment of a first polygonal multi-edge geometry (2) of a rotor shaft (2) of the dynamic mixer (4) with a second polygonal multi-edge geometry (5) of a drive shaft (6) of a motor (7) of a mixing apparatus (8), the orientation template (1) having a third polygonal multi-edge geometry (9) and at least one circular arc-shaped stop element (10), the third polygonal multi-edge geometry (9) being adapted to rotate the rotor shaft (3) of the dynamic mixer (4), the at least one circular arc-shaped stop element (10) being adapted to encompass in a positive-locking manner an inlet nozzle (11) of the dynamic mixer (4) in a defined rotational position of the orientation template (1) in relation to the rotor shaft (3) of the dynamic mixer (4).

21. Method of using an orientation template (1) for congruent and coaxial alignment of a first polygonal multi-edge geometry (2) of a rotor shaft (2) of a dynamic mixer (4) with a second polygonal multi-edge geometry (5) of a drive shaft (6) of a motor (7) of a mixing apparatus (8), the orientation template having a third polygonal multi-edge geometry (9) and at least one circular arc-shaped stop element (10), the third polygonal multi-edge geometry (9) being adapted to rotate the rotor shaft (3) of the dynamic mixer (4), the at least one circular arc-shaped stop element (10) being adapted to encompass in a positive-locking manner an inlet nozzle (11) of the dynamic mixer (4) in a defined rotational position of the orientation template (1) in relation to the rotor shaft (3) of the dynamic mixer (4).

Description

DESCRIPTION OF THE FIGURES

[0098] FIG. 1 shows a flow chart with the method steps of the method 100 according to the invention.

[0099] FIG. 2 shows the orientation template 1 according to the invention in side view and in a top view from above.

[0100] FIG. 3 shows the dynamic mixer 4 with a top view on the two inlet nozzles 11 and the rotor shaft 3.

[0101] FIG. 4 shows the interface between motor drive shaft 6 of the mixing apparatus 8 and rotor shaft 3 of the dynamic mixer 4 simplified as hexagonal geometry.

[0102] FIG. 5 shows the dynamic mixer 4 at the interface between rotor shaft 3 of the dynamic mixer 4 and drive shaft 6 of the mixing apparatus 8.

[0103] FIG. 6 shows a mixing apparatus 8.

[0104] FIG. 7 shows a detail of the mixing apparatus 8.

[0105] FIG. 8 shows a dynamic mixer 4 in cross-section profile.

EMBODIMENTS OF THE INVENTION

[0106] FIG. 1 shows a flow chart with the method steps of the method 100 according to the invention for congruent alignment of a first polygonal multi-edge geometry 2 of a rotor shaft 3 of a dynamic mixer 4 with a second polygonal multi-edge geometry 5 of a drive shaft of a motor 7 of a mixing apparatus 8. The method comprises the following method steps: in method step 102, an orientation template 1 is provided. The orientation template 1 has a third polygonal multi-edge geometry 9 and at least one circular arc-shaped stop element 10. In method step 104, the third polygonal multi-edge geometry 9 of the orientation template 1 is slid into or onto the first polygonal multi-edge geometry 2 of the rotor shaft 3 of the dynamic mixer 4. The first polygonal multi-edge geometry 2 of the rotor shaft 3 of the dynamic mixer 4 is thereby initially in an arbitrary rotational position. In method step 106, the first polygonal multi-edge geometry 2 of the rotor shaft 3 of the dynamic mixer 4 is turned on its own axis by means of the third polygonal multi-edge geometry 9 of the orientation template 1 in a defined rotational position, until the at least one circular arch-shaped stop element 10 encompasses in a positive-locking manner at least one inlet nozzle 11 of the dynamic mixer 4. In method step 108, the orientation template 1 is removed from the first polygonal multi-edge geometry 2 of the rotor shaft 3 of the dynamic mixer 4, the first polygonal multi-edge geometry 2 of the rotor shaft 3 of the dynamic mixer 4 being in a defined rotation position, the defined rotational position remaining fixed.

[0107] In method step 101, the drive shaft 6 of the motor 7 of the mixing apparatus 8 is driven into a pre-defined rotational position by a control function of the mixing apparatus 8. In method step 103, the pre-defined rotational position of the drive shaft 6 of the motor 7 of the mixing apparatus 8 is fixed.

[0108] In method step 110, the second polygonal multi-edge geometry 5 of the drive shaft 6 of the motor 7 of the mixing apparatus 8 is slid into or onto the first polygonal multi-edge geometry 2 of the rotor shaft 3 of the dynamic mixer 4, the second polygonal multi-edge geometry 5 of the drive shaft 6 of the motor 7 of the mixing apparatus 8 being in a defined rotational position.

[0109] FIG. 2 shows an orientation template 1 according to the invention in side view and in a top view from above. In one embodiment, the orientation template 1 is a plate having a third polygonal multi-edge geometry 9 and two circular arc-shaped stop elements 10. The third polygonal multi-edge geometry 9 of the orientation template 1 “fits” in or around the first polygonal multi-edge geometry 2 of a rotor shaft 3 of a dynamic mixer 4, so that the first polygonal multi-edge geometry 2 of the rotor shaft 3 may be brought into a particular defined rotational position by means of the third polygonal multi-edge geometry of the orientation template 1. In order to achieve a reproducible rotational position of the rotor shaft 3, two circular arc-shaped stop elements 10 are mounted on the orientation template 1, at which the two inlet nozzles 11 of the dynamic mixer 4 “stop” when rotating the rotor shaft 3 in a particular rotational position. This rotational position is the pre-defined rotational position of the rotor shaft 3 of the dynamic mixer 4.

[0110] In an embodiment, the third polygonal multi-edge geometry 9 of the orientation template 1 is a multi-edge outer geometry and the first polygonal multi-edge geometry 2 of the rotor shaft 3 is a multi-edge inner geometry. In a further embodiment, the third polygonal multi-edge geometry 9 of the orientation template 1 is a multi-edge inner geometry and the first polygonal multi-edge geometry 2 of the rotor shaft 3 is a multi-edge outer geometry.

[0111] In an embodiment, the third polygonal multi-edge geometry 9 of the orientation template 1 is a hexagonal outer geometry and the first polygonal multi-edge geometry of the rotor shaft 3 is a hexagonal inner geometry. In a further embodiment, the third polygonal multi-edge geometry 9 of the orientation template 1 is a hexagonal multi-edge geometry and the first polygonal multi-edge geometry 2 of the rotor shaft 3 is a hexagonal outer geometry.

[0112] FIG. 3 shows a dynamic mixer 4 with a top view on the two inlet nozzles 11 and the rotor shaft 3. The two inlet nozzles 11 form a reference line a which runs through the center of the rotor shaft 3. If a straight line b that runs parallel to one of the edges of the polygonal multi-edge geometry and does not run parallel to the reference line a is taken, the straight line and the reference line form an angle α. In this way, a particular rotational position of the rotor shaft 3 may be pre-defined by means of designating a specific angle.

[0113] FIG. 4 shows an interface between motor drive shaft 6 of the mixing apparatus 8 and rotor shaft 3 of the dynamic mixer 4 simplified as hexagonal geometry. The anterior hexagonal geometry is to be associated to the rotor shaft 3 of the dynamic mixer 4 respectively. The posterior hexagonal geometry is to be associated to the motor drive shaft 6 of the mixing apparatus 8. Corresponding edges 14, 15 of the two hexagonal geometries respectively form a common rectangular area A1 in case of plane-parallelism of the edges (FIG. 4b).

[0114] In case of slight turning of motor drive shaft 6 and rotor shaft 3 against each other, the corresponding edges 14, 15 do no longer form a common rectangular area A1, but two rectangular areas A1 and B1 tilted to each other. The tilt between these two rectangular areas A1 and B1 must not exceed 7.5 degrees, so that an accuracy of fit of hexagonal geometry of the motor drive shaft 6 of the mixing apparatus 8 and the hexagonal geometry of the rotor shaft 3 of the dynamic mixer 4 is still met sufficiently.

[0115] FIG. 5 shows a dynamic mixer 4 at the interface between rotor shaft 3 of the dynamic mixer 4 and drive shaft 6 of the mixing apparatus 8. The hexagonal geometry of the motor drive shaft 6 of the mixing apparatus 8 or of the rotor shaft 3 of the dynamic mixer 4, respectively, is centrally located. The two inlet nozzles 11 of the dynamic mixer 4 are located on the side. The centres of the two inlet nozzles 11 and the centre of the hexagonal geometry of the motor drive shaft 6 of the mixing apparatus 8 or of the rotor shaft 3 of the dynamic mixer 4, respectively, are on a line with each other. One edge of the hexagonal geometry of the motor drive shaft 6 of the mixing apparatus 8 or the rotor shaft 3 of the dynamic mixer 4, respectively, forms an angle α with this line. This angle may serve for determining a particular pre-defined rotational position of the hexagonal geometry of the motor drive shaft 6 of the mixing apparatus 8 or of the rotor shaft 3 of the dynamic mixer 4, respectively.

[0116] FIG. 6 shows a mixing apparatus 8. A motor 7 is arranged at the top of the housing. A motor drive shaft 6 can be seen protruding from the bottom of the housing.

[0117] FIG. 7 shows a detail from the mixing apparatus 8. The operation site of the double cartridge 12 is shown with inserted double cartridge 12. The motor drive shaft 6 runs between the cartridge bodies 13.

[0118] FIG. 8 shows a dynamic mixer 4 in cross-section profile. The dynamic mixer 4 comprises a chamber part 22 and a closing part 25. The rotor 30 is centrally arranged in the mixing chamber 24 of the chamber part 22. The chamber part 22 has a discharge opening 23 at its end, through which dental materials are discharged out of the mixing chamber 24 after mixing. Dental materials are inserted into the dynamic mixer 4 through a first inlet opening 26 or through a second inlet opening 27, respectively. A centrical opening 28 is centrally situated at the closing part 25.

REFERENCE NUMERALS

[0119] a reference line [0120] b straight line running parallel to one of the edges of the polygonal multi-edge geometry [0121] 1 orientation template [0122] 2 first polygonal multi-edge geometry [0123] 3 rotor shaft [0124] 4 dynamic mixer, in particular dental dynamic mixer [0125] 5 second polygonal multi-edge geometry [0126] 6 (motor) drive shaft [0127] 7 motor [0128] 8 mixing apparatus, in particular dental mixing apparatus [0129] 9 third polygonal multi-edge geometry [0130] 10 circular arc-shaped stop element [0131] 11 inlet nozzle [0132] 12 double cartridge [0133] 13 cartridge body [0134] 14 second edges [0135] 15 first edges [0136] 16 rectangle [0137] 22 chamber part (=housing of the mixer lid) [0138] 23 discharge opening [0139] 24 mixing chamber [0140] 25 closing part (=housing of the mixer bottom) [0141] 26 first inlet opening [0142] 27 second inlet opening [0143] 28 centrical opening [0144] 30 rotor [0145] 31 plane averting the rotor [0146] 32 plane facing the rotor [0147] 33 first passage opening [0148] 34 second passage opening [0149] 35 feeding duct [0150] angle α (FIG. 5)