DE1916439A1 - Positioning and driving device - Google Patents

Description

PATENT LAWYERS

dr. W. Schalk dipl.-ing. P. Wirth dipl.-ing. G. Dannenberg

DR. V. SCHMIED-KOWARZIK · DR. P. WE IN HOLD DR.D.GUDEL

6 FRANKFURT AM MAIN

CR. ESCHENHEIMER STR. 39

Gu / RK March 28, 1969

Societe lamy d'Etudes et

de research "SOIER" 200, Boulevard Saint-Denis Courbevoie (Hauts-de-Seine) France

Positioning and driving device

The invention "relates to a take-away device and precise and backlash-free positioning of rotating elements according to a cyclical program.

There are already numerous devices known to do this serve to take and position rotating organs, such as the Maltese Cross or Geneva Cross, such as also devices with a Maltese cross and arranged next to it, toothed sectors.

Devices with cams and rollers are also known, as well as control devices for an interrupted movement, as described, for example, in the French patent specification 1 046 301 and in the French Zusatzpatzntsohrift 63 550.

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Each of these devices has different working options, however, to a very limited number of combinations are limited.

The invention is based on the object of providing a device of to configure the type specified above in such a way that a Take along according to any periodic program always ■ can be carried out extremely precisely, without slippage, and with the holding of the organ to be positioned are as precise as desired in every position

The ^one device of the invention makes it possible to design mechanisms that work with hohen'Geschwindigkeiten without shock and slip by different programs. The element to be controlled is always taken along, so that a large amount of torque can be transmitted.

The invention thus relates to a take-away device and precise and play-free positioning of a rotating element, the rotating element being provided by at least one driver is taken along according to a periodic program, which can be given in at least one revolution of the driver (s) and / or a follow-up element, and wherein the direction can turn in two directions and the driver program consecutive and alternatively homokinetic and is not homokinetic and the rotation of the follower element compared to the rotation of the driver a given one Function of the program is. .

According to the invention, this device is characterized in that at least one follower element is provided which, on the one hand, has at least one first, freely rotating roller which limits the entrainment and positioning of the follower element in one direction of rotation and, on the other hand, at least one second, freely rotating Holla is provided, the take away and

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Position the following element in the opposite direction of rotation "determined, and that finally gear teeth are provided, which cause a homokinetic entrainment, both rollers are arranged with respect to the gear teeth such that each End and every beginning of homokinetic entrainment at the same time is effected by the two rollers and the gear teeth for the homokinetic entrainment, whereby a jerk-free, controlled, steady, very precise entrainment and positioning without G-guiding or play is achieved that the first role during the entire duration of the positioning and the non-homokinetic driving by both rollers behind a line remains that connects the centers of the! follower element and the driver, while the second role is in front of this Line is that at least one take away is provided, which on the one hand has at least one continuous rotating surface which interacts with a first roller of the follower element, and which continuously determines the entrainment and positioning of the following element in the direction of rotation, the rotating surface following one another a curved part for the homokinetic entrainment, a part corresponding to a predetermined function of the program, and has a curved part in the shape of a tooth-shaped cavity, which is the resumption of the homokinetic Entrainment corresponds, and the other hand to interact with a second role of the follower element at least has a steady rotating surface which, in the opposite direction of rotation, continuously entrains and positions the follower element causes the rotating surface successively a curved part, which is for homokinetic entrainment tooth-shaped cavity forms, a curved part, the one corresponds to the predetermined function of the program, and a curved part that resumes the homokinetic entrainment corresponds to, and that further gear teeth are provided for cooperation with the gear teeth of the follower element are, which are arranged on the one or more drivers that the beginning and end of each homokinetic entrainment at the same time through the gear teeth and the two rollers

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that acts with the bent parts for homokinetic Take the two assigned rotating surfaces together.

According to a preferred embodiment of the subject matter of the invention at least one first cover is provided, which is carried by the follower element, and one after the other in the course of the same program with at least two continuous rotating surfaces working in at least two different sectors a driver © are provided, and determine the driving and positioning of the following element in the direction of rotation and Realize at least two non-homokinetic punctures of the program, furthermore at least one second role is provided, which is also carried by the follower element and which one after the other with at least two continuous rotating surfaces, of which gede is assigned to the corresponding rotating surface, and the im Determine in the opposite direction the entrainment and positioning of the following element.

According to a further preferred embodiment of the subject matter of the invention, at least one follow-up element is on a shaft stored and are at least two. Driver mounted on two other shafts, the follower element having at least two rollers carries that work together at the same time, with two carriers that are mounted on different shafts, each Has driver at least one continuous rotating surface and each Scroll one after the other while the program is running. cooperates with all continuous rotating surfaces carried by the various drivers, with the rollers following one another act as a first roller that limits the entrainment and positioning of the following element in the direction of rotation, whereupon they act as a second role, which in the opposite direction determined the positioning and driving of the nasty carrier

If it is desired that the device stop the Follow-up element in positions that are as close as possible to specified Should stop, then after another,

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preferred. Design of the subject matter of the invention at least a first role of the driver is provided in the Direction of rotation determines the position of the lOlgeelemente and with at least two rotating surfaces, which are carried by the driver or drivers, cooperate, the rotating surfaces each having a cylindrically curved (Deil with a different radius and have the same center point that the axis of rotation of the driver and at least one second role of the pole element in the opposite direction, the position of the pole element is determined and with at least two continuous surfaces of rotation cooperating from the or the drivers are carried, the rotating surfaces each having a cylindrically curved part with a different radius and have the same center point as the axis of rotation of the driver, each of these rotating surfaces being associated with the first, corresponding rotating surface.

According to a further, preferred embodiment, the follower element carries at least two pairs of first and second rollers which interact with at least one of two pairs of associated rotating surfaces which are carried by the driver or drivers, each pair of rollers being arranged on a different sector of the follower element, and wherein the mutually associated rollers are each arranged in different planes that are ^{perpendicular to the axis of rotation of the I 1} OIgeelements and the driver (s), they simultaneously have both pairs of associated rotating surfaces and work together with one or the other pair of rollers of the follower element, the selection and the choice of function of the driver and the positioning ^ is determined by the pair of rollers which is carried by the lolgeelement.

The axes of the follower element and the driver can coincide. The first and the second roller, which is carried by the pole element, are designed in the shape of a truncated cone. The rotating surfaces, which correspond to the driver, are

9098 A 17 1165

the other assigned to cooperate with the frusto-conical rollers. The teeth for the constant velocity drive are formed by conical gear teeth. The device can have one or more drivers, each of which cooperates with a plurality of follow-up elements.

The roles of the following element can be carried by splashing, which are formed by the toothed surfaces of the following element. "

According to a further preferred embodiment, each first Roll of the follower element on the first tooth of each constant velocity drive sector and every other roll on the last Tooth of this sector arranged, the diameter of the roller and its position relative to the partial diameter of the toothing is selected for homokihetische entrainment in such a way that the Circumference of the role touches an imaginary concave curve that the Represents the flank of a gear tooth of the same partial diameter *

In order not to be able to fulfill homokinetic functions that the homokinetic entrainment of different proportions precede or follow it is the diameter of the two Rolls of the follow-up element and their position are selected such that the circumference of these rolls touches an imaginary concave curve which represents the flank of a gear tooth, the field diameter of which corresponds to that of the smaller of the two gear sectors.

At least the following element can be made of plastic, for example injection molding, with the roles of the following elements in a gear tooth with an elastic opening, which limits the axial play, are stored, the opening is arranged in such a way that during the entire operation Interaction with a Drehfläohe the resultant of the forces acting on the rollers in a rounded recess this opening shows

909841/1165

The invention is explained in more detail below on the basis of exemplary embodiments. It shows:

Pig. 1 schematically shows a plan view of an embodiment the subject matter of the invention;

Pig. Figure 2 is a plan view corresponding to Pig. 1, but the The driver and the pole element are arranged differently;

Pig. Figure 3 is a side view of the Pig device. 1 and 2;

Pig. 4 is a diagram showing the entrainment program of the Pig device. 1 to 3;

Pig. 5 is a view corresponding to Pig. 1 in a further embodiment;

Pig. Figure 6 is a side view of the Pig device. 5;

Pig. 7 is a view corresponding to Pig. 1 in a further embodiment;

Pig. 8 is a view corresponding to Pig. 7, but with the Elements are arranged differently;

Pig. 9 is a side view of the Pig arrangement. 7 and 8;

Pig.10 a diagram with the take-away program of the arrangement after Pig. 7 and 8;

Pig.11 an example of the assembly of the rollers on the pole element;

Pig.12 is a side view showing the arrangement of the rollers in shows the parallel planes and

Pig. 13 the assembly of a roller in a gear tooth.

The one in Pig. 1 and 2 shown device includes a driver 1 with firei interlocking planes on one axis

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is arranged and conjugated two at two different sectors Pairs of rotating surfaces has "These are the rotating surfaces 3 and 3 ', which are arranged in the same plane, and the surfaces of rotation 4 and 4', which are in a different plane, as also from Fig. 3 it can be seen «Furthermore, the Driver 1 in its third level has two gear sectors for homokinetic engagement 5 and 5 '.

The driver 1 works together with a follower element 6, which also has three positive planes. This follow-up element is arranged on a Y / Elle 7 and carries three rollers 8, 8 ¹ and 8 ″ in a first level, each of which is arranged at 120 from one another two rotating surfaces 3 and 3 'of the driver 1 work together «In the course of their cooperation with one of the two rotating surfaces, each of these rollers causes the entrainment with rotation and the positioning of the follower jacket 6, which in its second plane drgi other rollers 9, 9' and 9 ", which are also arranged by 120 from one another and which cooperate with the surfaces 4 and 4 'of the driver 1. These roles 9 »9 'and 9" cause the entrainment and positioning in the opposite direction.

The rollers 8, 8 'and 8 "(Fig. 1 and 3) are loose on axles 8a, 8'a and 8 "a arranged, in turn by two flanges 10 and 11 are worn. The roles 9, 9 'and § "are open Axles 9a, 9'a and 9 "a mounted, which of flanges 11 and 12, which are connected to the follower element 6.

Each roller 8, 8 ¹ or 8 "remains behind the line during operation · * which connects the two center points of axes 2 and 7" Each roller 9, 9 'and 9 "remains in front of this line during operation. The following element 6 has in its third level three gear sectors 13, 13 'and 13 "for homokinetic entrainment,

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one after the other with one of the two gear sectors 5 and of the carrier 1 work together.

In the embodiment shown, each of the three rollers 8, 8 'and 8 "works once with the rotating surface 3. When this program is run, the follower element rotates twice and the driver rotates three times Entrainment, a part 15 which causes a deceleration, a concentric part 16 which holds the follower element 6 in positions 0, 8 and 16 (cf. FIG. 4), a part 17 which causes acceleration and finally a Part in the form of a tooth cavity 18, which accompanies the return of the homofcinetic entrainment »In the following, homokinetic is understood to mean a connection between two shafts, whereby neither an acceleration nor a deceleration of the rotational speeds should occur. Each of the three rollers 8, 8 'and 8_" works in a similar way once in the course of the same program with the rotating surface 3 '? which similarly has a part 14 for constant velocity driving, a part which causes a delay, a part 16 ¹ which is arranged concentrically to the axis 2 of the driver, the radius of which is smaller than that of the corresponding part 16 of the rotating surface 3 '* whereby a stop of the follower element 6 is effected in the positions 1, 9 and 17, and a part which brings about an acceleration and finally a part in the form of a tooth cavity 18 * through which the homokinetic movement is resumed.

Each of the three rollers 9, 9 ¹ , 9 ″ interacts once in the course of the program with the rotating surface 4, which is conjugated or assigned to the rotating surface 3. This rotating surface 4 has the following elements: a part in the form of a tooth cavity 19 »aaa which ensures the homokinetic entrainment, a part »which causes a delay, a part 20 concentric to the axis 2,

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a part that causes an acceleration and a part 21 for the homokinetic entrainment. Each of the three balls 9 »9 ¹ » 9 "works in the same way once with the rotating surface 4 ¹ , which is conjugated to the rotating surface 3 ^f . This rotating surface 4 ¹ is composed in a similar way. It contains a part 19 * for the homokinetic Entrainment, a part that causes a delay, a part 20 'concentric to the axis 2 with a larger radius than the corresponding part 20 of the rotating surface 4 "a part that causes an acceleration, and * a part for constant velocity entrainment 21".

The gear teeth are in such a way on the driver 1 and the follower element 6 arranged that the beginning and the end of each Period of constant homokinetic entrainment by the gear teeth at the same time 13 and 5 as well as by two lobes 8 and 9, which together with the parts for the homokinetic entrainment of the corresponding rotating surfaces 3 and 4, work. From this example, you can see that two adjacent Positions 1 and 2, 8 and 9, and 16 and 17 of the two Rolls 8, 9, 8 »and 9 'as well as 8" and 9 "can be determined.

In Pig. 1 shows the situation in which the driver 1 goes through position 23. The following element 6 has its Delay ends and stops in position 0.

In FIG. 2, the driver 1 is in position 14 and the follower element 6 stops in position 1.

In Fig. 4, a predetermined one is in Cartesian coordinates Program played. This represents an example in which the positions taken do not match those of FIG. 1 or must match. Here is the rotary movement of a follow-up element measured by the rotation of a driver 1, whose positions are given in the abscissa. The positions of the following elements are given in the ordinate «,

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FIG. 5 shows a further exemplary embodiment in which a follower element 6 is mounted on a shaft 7. This Follower element is controlled by two drivers 22 and 23, which in turn are arranged on shafts 24 and 25. The drivers 22, 23 engage with their gear planes 26, 2? into the gearing 28 of the drive wheel 29, which is mounted on a shaft 30.

From Fig. 6, which shows the arrangement according to FIG. 5 in a side view, it can be seen that the four rollers 31, 32, 33 and 34, which are mounted between two flanges 35 and 36, which in turn are connected to the follower element 6, in the are arranged on the same level.

The follow-up element 6 also carries four tooth sectors 37, 38, 39, 40 for howoirinetic entrainment. These work alternatively with the gear wheel planes 26, 27 of the two drivers 22, 23. Each roller 31, 32, 33, 34 acts as an alternative to the continuous surface of revolution 41 of the driver 23 together, then _c with the continuous surface of revolution 42 of the driver 22, the driver acts first as a roller 8, then as roller 9, as shown in Fig. 1 is shown. The role that works with the driver 23 limits the entrainment and the movement of the follower element 6 in the direction of rotation until the roller that works with the driver 22 determines the entrainment and positioning of the follower element 6 in the opposite direction of the rotary movement. Each driver 22 or 23 has only one continuous rotating surface 42 or 41. It is obvious that any other combination of rotating surfaces and rollers is possible, _o

7 shows a further example in which a follower element 43 is mounted on a shaft 44. A driver 45 is attached to a shaft 4-6

Y / ie also evident from Fig. 9, the follower element 43 has five flanges 47, 48, 49, 50 and 51, between which four rollers

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^BA O ORIGINAL

52, 53, 54 and 55 are arranged, in four different planes. ! These can work together with four rotating surfaces 56, 57, 58 and 59, which are carried by the driver 45. The surfaces of rotation thus form two pairs of conjugate surfaces, each of these pairs only being able to work together with one of the two pairs of rollers. and in a sixth level a gear sector 61 "" These gear sectors can work together with the gear sectors 62 and 63, which in turn are carried by the driver 45 _{or the like}

The axes of the four rollers which are carried by the paddles 47 to 51 are advantageously on the partial circumference of the smallest of the two gear sectors 60, 61 - in the example shown, the gear sector 60 and in such a way that the circumference of each roller touches an imaginary curve that forms a plank of a homokinetic G-drive - tooth of the small gear sector 60 touches.

The driver 45 is in the ΡθθϊΦϊθϊιθη-? Pig. 7 and 8 in the Position 9 is shown, while the following element 43 in FIG. 7 assumes position 12 and in FIG. 8 the position 27 "

A diagram showing the sequence of the positions of the individual elements zei & t is indicated in FIG. The ordinates are here the positions of the follower element 43 indicated, while the abscissa shows the positions of the driver 45. This diagram shows the take-away program and the positioning of the Follower element 43. "

As can be seen from FIG. 10, the cyclic entrainment "program, which consists of one revolution of the follower element 43 and", is composed consists of two rotations of the driver 45, together as follows:

909841/1165

BATH ORIGINAL

A first, non-homokinetic function, that of the interval corresponds, which is traversed by the follower element 43 between its position 10 and its position 13, and one Slowing down between 10 and 12 includes a stabilized stop in position 12 and acceleration from 12 after 13 »by means of the cooperation of the two roles 52 and 53 with the two conjugate rotating surfaces 56 and 57;

an entrainment from position 13 to position 27 in relation 32: 24 by engaging the constant velocity teeth 61 of the follower element 43 with the toothing 63 of the driver 45}

a second, non-homokinetic function, the interval which is traversed by the follower element 43 between its position 27 and its position 21. This includes a slowdown from 27 to 28, a non-homokinetic drive by rolling from 28 to 29 »an acceleration from position 29 to position 31 by means of the two rollers 54 and 55, which are connected to the two conjugate rotating surfaces 58 and 59 work together;

a transfer from position 31 via position 0 to position 10 in a ratio of 16: 24 », namely via the homokinetic gearwheel sectors 60 of the following element 43» that with the gearwheel sector 62 of the driver 45 cooperate.

In FIGS. 11 and 12 there is a particularly simple and advantageous one Assembly of the rollers 64, 64% 65 and 65 'on a follow-up element 66 shown, which is carried along by a driver 67. The roles are between three with the follow-up element 66 connected surfaces 68, 69 and 70 arranged. They each have two homokinetic tooth sectors with three faces 71, 72 and 73 of the driver 67 come into engagement, each of which in turn has a homokinetic tooth sector.

909841/1165

'- 14 -

The diametrically arranged rollers 65 and 65 ^! are provided between the surfaces 68 and 69 of the follower element 66, while the rollers 64 and 64 'are arranged between the surfaces 69 and 70 of this element. The rollers 64 and 64 'can alternately cooperate with a rotating surface 74 which is formed on the element 67 between the surfaces 72 and 73. Likewise, the rollers 65, 65' can cooperate with the rotating surface 75 which is formed on the element 67 between the surfaces 71 and 73 72 is formed.

The rollers 65 and 65 'are from the first tooth of each of these Sectors of the homokinetic gear of the surfaces 68, 69 of the follower element 66 carried, while the rollers 64, 64 * from last tooth of each of the homokinetic gear sectors of the surfaces 69 and 70 are supported «The first and last The tooth of each of these sectors consists in an advantageous manner of large teeth, which with the surfaces 71, 72, 73 of the Mitnnahm.rs 67 work together

In Fig. 13 another example of assembly is shown, which shows the attachment of the rollers to pieces made of plastic, for example on injection molded parts. It instructs Tooth 76 has a slot 77 which is arranged such that the resultant of the forces when a role cooperates 78 presses the roller into the rounded recess 80 of the slot with a rotating surface (not shown). Here you can Roller 78 and its axis 79 can be made in one piece.

Because the driver and the following elements also have high torques should be transmitted, each / aolle in a ball bearing or Be stored needle roller bearings. Si © can also come directly from a ter-like Bearing that is carried by an axle that is connected to the parts of the follower element, which are the flanges or form areas.

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Claims (1)

March 28, 1969 1916 4 3 9 Societe Lamy d'Etudes Gu / RK Ag de Recherche a "BvLEH ¹ H Claims 1. 'Take-away device and -,. Accurate and play-free Positioning a rotary organ, whereby.das rotary organ through at least one driver is taken along according to a periodic program, which in at least one revolution of the or the driver and / or a follower element can be given, and wherein the device extends in two directions turn 1-ann and the Mitnelimer program on top of each other following and alternatively homokinetic and not homokinetic is formed and the rotation of the follower element compared to the rotation of the driver is a predetermined one The function of the program is characterized in that at least one follow-up element (6, 43, 66) is provided which on the one hand at least one first, freely rotating roller on v / eist ·, which takes along and positioning the Follower element limited in a sense of rotation and on the other hand at least one second, freely rotating roller is provided is that determines the entrainment and positioning of the follower element in the opposite direction of rotation and that Finally gear teeth are provided which have a homokinetic Cause entrainment, both roles are arranged with respect to the gear teeth so that ^ edes end and each beginning of the homokinetic entrainment at the same time from the two rollers and from the gear teeth for the homokinetic Entrainment is effected, whereby a jerk-free, controlled, steady, very precise entrainment and positioning without sliding or play is achieved that the first roller during the entire duration of the positioning and the non-homokinetic entrainment by both roles behind a * -, ner line remains, which is the center of the following element ' and the driver (1, 22, 23, 45, 67) connects while the second roller is in front of this line that at least a driver is provided which, on the one hand, has at least one continuous rotating surface that is connected to a 909841/1165 first role of the following element interacts, and the in Direction of rotation continuously determines the entrainment and positioning of the follower element, with the rotating surface on top of one another following a curved part for the homokinetic entrainment, a curved part that of a predetermined Corresponds to the function of the program, and has a curved part in the form of a tooth-shaped cavity, which corresponds to the resumption of the homokinetic entrainment, and which, on the other hand, to the interaction with a second episode of the follow-up element at least one continuous Has rotating surface, which in the opposite direction of rotation a constant entrainment and positioning of the follower element causes the rotating surface successively a curved part, which for homokinetic entrainment forms a tooth-shaped cavity, a curved part corresponding to a predetermined function of the program, and a curved part that resumes the homokinetic Entrainment corresponds to, and that to interact with the gear teeth of the follower element further gear teeth are provided, which are arranged on the driver or drivers that the beginning and end each homokinetic entrainment is caused simultaneously by the gear teeth and the two knuckles, which with the curved parts cooperate for the homokinetic driving of the two assigned rotating surfaces «, 2ο device according to claim 1, characterized in that at least one first cover is provided, which is carried by the follower element, and which one after the other in the course of the same program with at least two continuous rotating surfaces working together on at least two different Sectors of a driver are provided and which determine the driving and positioning of the following element in the direction of rotation and at least two non-homokinetic functions of the program realize that further at least one 9 0 984 1/1165 second role is provided, which is also from the follower element is carried, and successively with at least two continuous surfaces of rotation, each of which is the corresponding one Rotary surface is assigned and which determine the entrainment and positioning of the following element in the opposite direction. Device according to Claim 1, characterized in that at least one follow-up element is mounted on a shaft and at least two drivers mounted on two further yokes are that the follower element carries at least two roles that are simultaneously, with two drivers that are on different Shafts are mounted, work together, each driver having at least one continuous rotating surface and each role interacts one after the other while the program is running with all continuous rotating surfaces, which are carried by the different carriers, with the rollers successively as a first roller act that limits the entrainment and positioning of the following element in the direction of rotation, whereupon they act as a second Acting role that determines the positioning and driving of the driver in the opposite direction. Device according to Claim 1, characterized in that at least one first roller of the follower element is in the direction of rotation the position of the follower element is determined and with at least two rotating surfaces carried by the driver or drivers are, cooperates, the surfaces of rotation each having a cylindrically curved part with a different radius and have the same center point that the axis of rotation of the driver and at least one second roller of the follower element * ment determines the position of the following element in the opposite direction and interacts with at least two continuous rotating surfaces, which are carried by the driver or drivers, wherein the surfaces of rotation each have a cylindrically curved part with a different radius and the same center as 909841/1165 have the axis of rotation of the driver, each of these Rotary surfaces is assigned to the first, corresponding rotary surface. Device according to claim 1, characterized in that the follower element carries at least two pairs of first and second rollers associated with at least one of two pairs Rotating surfaces cooperate, which are carried by the driver or drivers, each pair of rollers on a different sector of the follower element is arranged, and wherein the associated roles are each in different Planes are arranged which are perpendicular to the axis of rotation of the follower element and the driver or drivers stand, with both pairs of associated rotating surfaces and with one or the other pair at the same time Roles of the follower work together, and that the selection and function choice of the takeaway and the Positioning is determined by the pair of rollers carried by the following element » Are Torrichtung according to claim 1, characterized in that the axes of the follower and of the follower coincide with the first undmzweite roller which is carried by the follower element, a truncated cone tapers and the corresponding Drehflächendes driver züge- ¹ so arranged that it with the frusto-conical rollers work together, and that the toothing for the homokinetic driving is achieved by conical gears. Device according to claim 1, characterized in that each first roller of the follower element is arranged on the first number ^{11 of} each fiomokinetic drive actuator and every second roller on the last tooth of this sector, the diameter of the roller and its position relative to the partial diameter of the toothing for the homokinetic entrainment 909841/1 165 is selected such that the circumference of the roller touches an imaginary concave curve which is the flank of a gear tooth represents the same part diameter. 8. The device according to claim 1, characterized in that to realize the non-homokinetic function? ' the precede or follow the homokinetic entrainment with a different ratio, the diameter of the two roles and the follower element and their position are selected such that the scope of these roles a imaginary concave curve touches the flank of a gear tooth whose partial diameter is that of the smallest of the two tooth sectors. 9p device according to claim 1, characterized in that at least the following element of plastic, such as injection molding is, ^ ¹ wherein the rollers of the follower are stored defining the axial play in a gear tooth with an elastic opening, wherein the opening is disposed such that during the entire operation, when interacting with a rotating surface, the resultant of the forces acting on the roller points into a rounded recess of this opening The patent attorney: 0 9841/1165