DE102009004699A1 - Globoid rotary table for use in e.g. machine, during exchange of work piece, has rotary table body blocked in holding position in mechanical tolerance free manner by multiple bolting elements controlled by groove rollers - Google Patents

Abstract

The table has a motor drive provided with a rotary table body (4) that is supported at a housing, where multiple drive bolts are protruded from a lower side of the rotary table body. A control groove determines movement progression such as step-wise rotary movement, acceleration and a holding position, in which positioning of an output shaft in an engagement gear of the control groove takes place. The body is blocked in the holding position in a mechanical tolerance free manner by a single or multiple bolting elements (7, 8) controlled by groove rollers (2).

Description

genus

The The invention relates to a turntable with a motor drive with a rotatably mounted in rolling bearings on a housing Turntable body, from the underside of several in even Angular distances offset each other and on the same Diameter arranged drive bolts emerge, which in a Control groove of a type of helix, but according to mathematical laws of curvature trained, stored in the housing, through the engine driven, for example, cylindrical drive roller intervene, the rudder being the movements as step by step Rotational motion, acceleration, velocity and stopping positions in the positioning of the drive roller in the Rastgang the cam by, for example, two roller pins, determined.

Furthermore The invention relates to a Globoiddrehtisch with a star and a motor step-driven rotary table body associated therewith, and with several over the circumference of the star in even Angular distances arranged on the same diameter to each other Roller bolt, which with a trained as a globoid roller drive roller gear mesh, the globoid curve the movement of the turntable body such as stepwise rotary motion, acceleration, Speed course and holding positions determined and in the Rastgang the globoid roller z. B. a blockage of the turntable body done by the roller bolt.

State of the art

typical Applications for turntables are, for example, the workpiece change in welding systems of the body shop, the in and out of Workpiece carriers or rotary indexing tables for step-by-step work sequences and production processes, whereby such Rotary tables for horizontal use as well for vertical operation, for example as a drum drive, suitable. In operation, the incorporated in a cylindrical roller causes Curve a stepwise rotation of the table top around the step angle. In the holding position is a world low-backlash, form-fitting Positioning of the table top without additional locking achieved in the prior art in that locking bolts in the so-called Locked locking angle (Rastgang) prevent the rotation of the table top should. The trained in the cylinder roller formed as a drive roller Curve is usually hardened and ground and serves for low-vibration movement and long life. The in the curve engaging and designed as a roller bolt drive bolt are also hardened and ground and exist as well like the drive roller made of steel or a steel alloy.

Heavy-duty turntables typically used in foundries, in the manufacture of industrial products, in the glass industry and in the large gearbox and engine construction.

Globoiddrehtische are often designed as so-called compact turntables for Loads from 50 kg to 2000 kg with extremely short cycle times and high Precision with as play-free positioning as possible. The translation of the constant rotational movement of the motor Drive takes place by means of a globoid curve. Main application of such globoidal turntables are packaging machines, assembly machines, Textile machines, automatic handling machines, conveyor systems, welding machines and glassmaking machines and in manufacturing processes, in due to the high output on extremely short cycle times arrives. Globoidgetriebe itself usually consist of the so-called Star, which is the part of the device to be driven, for example a turntable, is assigned and the globoid curve, which at the Drive roller is arranged. Slopes of the curve can both to the right and to the left. The choice of the gear direction depends on the desired direction of rotation the drive shaft. Globoidgetrieben is the so-called downtime by determines the direction of rotation of the roller bolt. At internal standstill the roller bolt experiences a sudden reversal of the direction of rotation in the switching angle range, with external standstill learns the Roller bolt no reversal of direction of rotation in the shift range.

in the so-called locking angle, in which the slope of the respective curve is zero or nearly zero, the other Rotary movement of the turntable body through the in the gangway located roller bolt prevented.

Turntables of the type described above are for example in the EP 0 643 636 B1 described, while Globoiddrehtische, for example, from the catalog of the Applicant "rapid clocking and positioning" are visible.

Conventional stepper drives are thus designed to generally promote relatively high loads in extremely short cycle times. Since the drive takes place via a grooved roller, which moves the table top by means of roller bolts, there is always some play due to the formation of the groove due to the system. Therefore, in practice, it is not talked about backlash-free, but of low-drive drives. Proposed has also been the so-called use of web rolls in which locked in the ten position two drive bolts can be clamped almost free of play over an oversized web. But even in this case, the rigidity of the end position is limited by the bearing dimensions of the drive pin.

Especially in the body shop of the automotive industry, the aim is to use several tools For example, tensioner tools for receiving the body very accurately to position and exactly in the defined position lock. It comes here to extremely high rigidity and accuracy the end positions, which in conventional drives such as turntables with cylindrical drive roller and groove and globoid turntables only be achieved by an appropriate dimensioning of the entire mechanics can, which is very expensive.

It is also already known, a blockage of the turntable in appropriate End positions by an additional drive with pneumatic cylinders and electric drive motor, wherein a pin the Position locked between turntable frame and table top. A Such additional position stake out is on the one hand with a high technical overhead (additional mechanics, Control module) and on the other hand leads to a prolonged Cycle time, since only after the absolute standstill of the turntable the locking pin can be moved.

task

Of the Invention is based on the object, conventional turntables with motor drives and globoid turntables in such a way, that they are with structurally simple means an accurate fixation and maintain rigidity of each defined position.

solution

The The object underlying the invention is characterized by in the claims 1 or 2 reproduced features solved.

Some advantages

The inventive solution for Turntables and globoidal turntables are different from those used in the past Technique turned from a mindset, a precise and very stiff end position by a correspondingly high effort in to achieve mechanical Rather, the invention takes aware of both conventional turntables with Grooved roller drive as well as for globoide rotary tables in purchase that in Rastgang usually two roller pins the respective turntable body block, the roller pins may well have some play, because in the holding position a secure locking by a, preferably at least two mechanical locking elements takes place, either directly from the grooved roll or from the globoid roll Blocking position and be controlled in release position. Consciously, therefore, a certain game of rolling pins in the gangway the curve, no matter if in conventional rotary tables or globoidtischen, be accepted, because by accordingly wide and very stable attack surfaces the mechanical locking elements with appropriate accordingly large dimensioned bearings of the drive shaft - grooved Drive shaft or globoid shaft - a very rigid and reproducible and ensures play-free end position of the drive can be. Unlike the previous mindset, by as possible high precision and correspondingly high expenditure the corresponding Stiffness and accuracy of the end positions of the turntable body To achieve, therefore, in the invention aware of a certain Game of rolling pins are accepted because of the locking elements reached the desired end position with simple means backlash becomes. In each dwell or Rastgang the step movement For example, right and left of the corresponding Grooved roller or globoid roller arranged driver in a special Milling cutout of the turntable body engage and this defined in the desired angular position and play lock. With a rotary motion of, for example, 360 ° the drive shaft - grooved shaft or globoid shaft on the one hand - is eliminated an additional external stakeout as well as an extra Control unit for further aids.

Further inventive embodiments

Further inventive embodiments, which in case of need also for the solution of the problem underlying the invention can contribute inventive, are in the claims 3 to 9 described.

claim 3 describes an embodiment in which preferred two rotationally driven by the corresponding grooved roll or globoid roll Locking elements in corresponding recesses of the turntable body engage positively and this defined in the respective holding position and free of play against unintentional movement.

at the embodiment according to claim 4 block the Locking elements the corresponding drive roller - grooved roller or globoid roller - opposite the housing, having the recesses for engaging the locking elements.

According to claim 5, the blockage takes place tion by the locking elements frictionally, while the blocking is made in the embodiment according to claim 6 generally positive fit.

Prefers is in the embodiment according to claim 7 the Locking and unlocking of the drive shaft - Nutwelle or Globoidwelle - controlled by rotary motion.

Becomes an embodiment selected according to claim 8, have the role of bolts in Rastgang a corresponding game against the groove shaft or globoid shaft, while the lock exclusively done by the locking elements themselves.

advantageously, are the locking elements according to claim 9 as disk-shaped and on the respective drive shaft - groove shaft or Globoid shaft - arranged and non-rotatable with the drive shaft connected discs formed as a locking cam Body having in corresponding recesses the lower side of the turntable body or housing engage in blocking or locking position (holding position), wherein the respective disks are driven synchronously. The locking cams are arranged at the same angle of rotation of the drive roller.

In the drawing, the invention is for example in use a Globoiddrehtisch - partly schematically - illustrated. Show it:

1 a partial perspective view of a Globoiddrehtisches;

2 the out 1 apparent Globoiddrehtisch with two locking elements located in the locking position on the turntable body, also in perspective view, from a different direction of view;

3 another perspective view of Globoiddrehtisches according to 1 and 2 again from a different angle;

4 from the 1 to 2 apparent Globoiddrehtisch, partly in perspective view, partly in section, wherein the locking elements are out of engagement with the turntable body;

5 another perspective view of Globoiddrehtisch accordingly 4 , shown from another angle, partly broken out, also in the unlocked position of the locking elements;

6 the one from the 1 to 5 apparent Globoiddrehtisch, wherein the locking elements are arranged in recesses on the underside of the turntable body blocking / locking (holding position);

7 an end view in the direction of the longitudinal axis of the globoid roller;

8th a perspective view, shown partially broken away, in the holding position of the turntable body (locking elements in blocking position);

9 a flow chart of the locking, movement and locking angle / blocking angle;

10 a schematic development of the globoid roller with locking elements;

11 Intervention of roller bolts in the gangway with locking elements, purely schematic, and

12 Ab- and drive angle as a diagram.

In The drawing is the invention in application to a Globoiddrehtisch illustrated. Globoidal turntables are usually made by a factory mounted slip-on geared motor driven. The step side is determined by the gear ratio. The turntable can also be delivered without drive and directly into the Drive chain of machines are integrated.

Globoiddrehtische are on with hardened and ground Globoidkurven Globoid rollers and cam rollers (all made of steel alloys).

With the reference number 1 is referred to a housing in which in tapered bearings a globoid roller 2 is mounted drivable by an electric motor, not shown. Of the tapered roller bearings is only one of the drawing and the reference numeral 3 designated. At the opposite end region is the globoid roller 2 through a similar tapered roller bearing 3 rotatably mounted. The two tapered roller bearings 3 are braced in the same direction in the axial direction against each other to have the least possible play in the axial direction and to record the reaction forces occurring through the power flow in the direction of arrow AB as possible without play.

With 4 is called a turntable body, on its underside with a star 5 Is connected by gearing, which at its periphery on the same diameter at the same angular distance from each other numerous rolling pin 6 that has with the groove of the globoid roll formed by the globoid curve 2 combing during the rotational movement and thereby the turntable body 4 around the longitudinal axis of the star 5 turn gradually.

On the globoid roller 2 are at an axial distance from each other two locking discs designed as annular discs 7 and 8th via non-illustrated tongue and groove connections rotatably and arranged at the same angle of rotation, so that both locking elements 7 . 8th synchronous with the globoid roller 2 turn and be driven by this. The locking elements 7 . 8th have arranged at the same angle of rotation, designed as radial projections locking cam 9 respectively. 10 on, which gradually in the Rastgang of two roller bolts 6 in at the bottom of the turntable body 4 arranged recesses 11 respectively. 12 engage positively and thereby the turntable body 4 Block / lock in clearance without play. With the further turning of the globoid roller 2 give the locking elements 7 . 8th with their locking cams 9 . 10 after passing the locking angle range of z. B. 60 ° in the locking angle, the rotation of the star 5 free again, leaving the turntable body 4 can be further rotated cyclically.

The flowchart in 9 Illustrates, for example, locking, movement and locking angles, while the scheme in 10 once left in the settlement, the representation of the locking angle of z. B. 50 ° and a 260 ° travel angle for a 90 ° output angle illustrates, together with the position of the locking cam 9 respectively. 10 the locking elements 7 and 8th while the 11 illustrates how the locking cam 9 and 10 the locking elements 7 and 8th together with the globoid roller 2 and their star 5 interact.

The in the abstract, in the claims and in described in the description and apparent from the drawing Features can be used individually or in any combination be essential for the realization of the invention.

1

casing

2

Globoidwalze, Grooved roller, drive roller

3

Tapered roller bearings, Bearings, Rolling Bearings

4

Turntable body turntable

5

star

6

roller pins

7

locking element

8th

locking element

9

locking cam

10

locking cam

11

recess

12

recess

FROM

power flow

bibliography

• EP 0 643 636 B1 Brochure of the Applicant "Fast Clocking and Positioning"

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• EP 0643636 B1 [0007]

Claims (9)

Rotary table with motor drive with one in rolling bearings rotatable on a housing ( 1 ) mounted turntable body ( 4 ), from whose underside a plurality of evenly spaced angularly offset from each other and arranged on the same diameter drive bolts emerge, which in a control groove of a screw-like, but according to mathematical Kurvengesetzen formed in the housing ( 1 ), driven by the motor, for example, cylindrical drive roller engage, the control groove, the movements such as gradual rotational movement, acceleration, speed course and holding positions in the positioning of the drive roller in Rastgang the control groove is effected by, for example, two roller pins, characterized , characterized that the turntable body ( 4 ) are additionally blocked in its respective holding position by a controlled by the grooved roller locking element or by a plurality of controlled by the grooved roller locking elements free of play. Globoid turntable with a star ( 5 ) and associated therewith a motor step-wise driven turntable body ( 4 ), and with several over the circumference of the star ( 5 ) at equal angular intervals on the same diameter to each other arranged roller bolt ( 6 ), which with a globoid roller ( 2 ) formed driving roller mesh, said Globoidkurve the movement of the turntable body ( 4 ) such as stepwise rotational movement, acceleration, velocity course and holding positions and in the gangway of the globoid roller ( 2 ) z. B. a blockage of the turntable body ( 4 ) by the roller bolts ( 6 ), characterized in that the turntable body ( 4 ) in the gangway in addition to the roller bolt ( 6 ) or instead by a locking element, preferably by a plurality of the globoid roller ( 2 ) controlled locking elements ( 7 . 8th . 9 . 10 ) is blocked against rotation without play. Turntable according to claim 1 or 2, characterized in that in the angular stoppage area at an axial distance from each other as a catch formed locking elements ( 7 . 8th . 9 . 10 ) in a respective recess ( 11 . 12 ) of the turntable body ( 4 ) or an underside of a tabletop and engage the turntable body ( 4 ) defined in the stop position and block free of play. Turntable according to claim 1 or 2, characterized in that the locking elements ( 7 . 8th . 9 . 10 ) the relevant drive roller ( 2 ) opposite the housing ( 1 ) in holding position. Turntable according to claim 1 or 2, characterized in that the locking elements ( 7 . 8th . 9 . 10 ) designed as a groove roller or as a globoid roller drive roller ( 2 ) lock in holding position frictionally. Turntable according to claim 1 or 2, characterized in that the locking elements ( 7 . 8th . 9 . 10 ) designed as a groove roller or as a globoid roller drive roller ( 2 ) lock positively in holding position. Turntable according to claim 1 or 2, characterized in that the locking elements ( 7 . 8th . 9 . 10 ) by the drive roller ( 2 ) are controllable in the locking and unlocking position by rotational movement. Turntable according to claim 1 or 2, characterized in that in the holding position of the respective turntable body ( 4 ) the roller bolts ( 6 ) with respect to the groove of the drive roller ( 2 ) z. B. a globoid roll, are arranged with game and only the locking elements ( 7 . 8th . 9 . 10 ) the turntable body ( 4 ) in the stop position lock and block play. Turntable according to claim 1 or 2, characterized in that the locking elements ( 7 . 8th . 9 . 10 ) than on the relevant drive roller ( 2 ) coaxially arranged discs with radially protruding locking cam ( 9 . 10 ) are formed, which at the same rotational angle with respect to the drive roller ( 2 ) and are driven synchronously by this.