DE3332670A1 - Transfer machine - Google Patents

Abstract

A transfer machine contains work stations having tools arranged and driven along a path as well as at least one pallet movable by means of rollers along said path, which has clamping devices for holding in the correct position workpieces to be machined in the work stations, and can be moved on from one work station to the next work station cyclically by a drive device. Positioning devices are additionally provided in order to fix the pallet in the correct position relative to the respect work stations. In order to improve the working accuracy of the transfer machine while ensuring relatively inexpensive production, the pallet contains a feed device which carries the clamping devices for the workpieces and has a positive drive by means of which the workpiece can be placed on the tools in the relevant work station, so that feed devices in the individual work stations are unnecessary.

Description

Cross Europa-Werk GmbH / industrial area / Wertstrasse 20, 7317 Wendungen

Transfer machine

The invention is based on a transfer machine with arranged and driven along a path Workstations having tools, with at least one on the track by means of rollers along movable pallet, the clamping devices for holding in the correct position in the Has work stations to be processed workpieces and by a drive device cyclically can be moved from one workstation to the next, as well as with positioning devices, through which the pallet can be fixed in the correct position with respect to the respective workstations is.

In such transfer machines known from practice, workpiece carriers or pallets are used used on which the workpieces are immovably clamped. When machining the workpieces in the respective work station, the infeed movement takes place from the work station, i.e. the rotating tool is fed from the work station onto the workpiece, for which each individual work station has its own Support facility must be equipped. the

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Support or feed devices of the individual workstations have to ensure a high level of working accuracy to be able to be executed with very great precision and also because of the enormous weight of the workstations of transfer machines be very large. This is usually the one in the respective workstations The part to be moved, which sits on the feed device, is many times heavier than the object to be processed. The underlying service life of the feed devices of the individual workstations also require a very large dimensioning of the guide devices the feed device, but without being able to prevent the guide devices because of the large weights to be borne by them wear out relatively quickly, faster in any case, as if they only had to carry small weights.

However, since the feed devices of the individual workstations do not wear out evenly, the machining precision changes over time and additional tolerances arise between areas that are processed by different workstations. These additional Deviations can also not be compensated by the fact that the workpiece with a game is spanned in the feed devices taking into account position, since the game, as above executed, is different in the individual workstations.

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In the known transfer machines, therefore, there must always be a compromise between the cost outlay for the feed devices of the individual workstations and the desired machining accuracy of the workpieces can be found, with either the costs for the feed devices increase enormously if high precision is required is, or a loss of long-term precision must be accepted when the feed devices 'the individual workstations should be inexpensive.

The object of the invention is therefore to provide a transfer machine that is overall more cost-effective create in which the workpieces can be machined with a very high degree of precision.

To solve this problem, the transfer machine according to the invention is characterized by the features of Main claim.

By using the feed device on the pallet, the workstations can significantly be cheaper, since their feed device can be omitted. In addition, the feed device the pallet can be made much lighter and more precisely because it has only one ratio has to bear a moderately light load compared to the weight of the drives and bearings used in the Ar auxiliary stations arranged on the feed device are.

Since also in the transfer machine according to the invention the feed device with the workpiece

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dert, κοη-

Wear and tear from workstation to workstation can be observed over time Compensated in the feed device by corresponding correction when clamping the workpiece are, with which a high processing accuracy is obtained over a relatively long time remain. The spread between the feed movements of the individual workstations, as they occur in the known transfer machines, are eliminated.

Finally, in the transfer machine according to the invention, the necessary drives are reduced, and also the control of the work stations becomes easier because iii these no feed movement needs to be controlled more.

If planning work, such as face milling, has to be carried out on the workpiece, it is sufficient to use the respective work station to be provided with a simple feed device, the working direction of which is perpendicular to the feed direction the arranged on the pallet feed device, so that without very expensive Cross support in the workstation that suffices.

A structurally very simple feed device contains a feed device which is arranged in a stationary manner on the pallet Guide rails, as well as a clamping device for the workpiece holding and on the guide rails slidingly mounted table, which is arranged by a table on the pallet Drive motor with gear is displaceable on the guide rails, the guide rails run at right angles to the track,

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along which the pallet can be moved. · Very high precision when moving the table is achieved when the gearbox has a recirculating ball screw drive between the drive motor and the table contains, while the drive motor itself is an electric motor.

The positioning devices advantageously contain at least two on the underside ' flat and horizontally running stop surfaces spaced apart from one another on the pallet, which are located on a line running parallel to the path and in the area of the respective Workstations facing the front edge of the pallet are provided, the stop surfaces with corresponding stop surfaces located in the area of the respective work station, which are optionally adjustable, cooperate in the sense of an exact height fixation of the pallet. An automatic clamping of the pallet in the positioning devices is achieved if at least two on the underside the pallet in the area of the front edge arranged stop surfaces are provided which are inclined with respect to the vertical, such that their lower edge is closer to the center of the Pallet lies as its upper edge, and where the projection of the surface normal on one The horizontal plane runs essentially in the direction of the feed direction, while the Stop surfaces with corresponding complementary inclined surfaces in the area of the respective work station in the sense of an exact fixation in

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Cooperate feed direction namely acts with this type of positioning device on the inclined surfaces, the reaction force as they caused by the tool penetrating the workpiece, the pallet becomes pulled down on the sloping surfaces on their seat.

A with a corresponding recess can be used to fix the pallet in the longitudinal direction of the web cooperating, longitudinally displaceably mounted index bolts can be provided, with either the Index bolt or the recess on the pallet is provided, which has the advantage that only very small lifting and sliding movements are required for the positioning devices to separate the pallet and the web so far that the pallet can be moved to the next work station.

The index bolt cannot get caught and there is a small operating force for the Index bolt is possible if it is positively driven and displaceable because then there is no spring force to be overcome. The drive of the index bolt becomes very easy if it has a two- ·; fluid drive acting on the side, i.e. a. '

Contains a hydraulic or a pneumatic cylinder, which has a two-way acting Wedge gear shifts the index bolt lengthways. For this purpose, the index bolt contains an enforcing, opening with a rectangular cross-section,

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the oblique to the longitudinal axis of the index bolt. runs while one through the opening going slide of the same cross-section as the opening is provided, the slope of which Corresponds to the opening and which is guided with the at right angles to the longitudinal axis of the index bolt Fluid drive is coupled.

When the index bolt is cylindrical and cooperates on its with the recess The end has two planar, mutually adjoining bevel surfaces, the common cutting edge of which runs in the direction of the adjacent end face of the index bolt on its longitudinal axis, while the recess cooperating with the index bolt carries complementary bevel surfaces, then can move the pallet into its correct position when the index bolt is pushed into the recess which eliminates residual positioning errors of the pallet. The-cylindrical Index bolt also enables very simple storage in a corresponding cylindrical Drilling. However, it is easily possible to give the index bolt a different cross section give what, however, then possibly makes the production of the guide opening more expensive. the The index bolt can be secured against rotation through the opening of the index bolt Slide of the wedge gear are provided.

Even with the unavoidable play of the index bolt in its guide, a static

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certain storage can easily be achieved by attaching the index bolt over its entire length the side opposite the cut edge of the two bevel surfaces is flattened so that only still carry the parts of the index bolt lying next to the flattened point and absorb a reaction torque. Overall, this results a backlash-free fixation.

A further simplification of the transfer machine is achieved if the pallet is the drive device contains, which is rotatably coupled to at least one of the rollers in the pallet are rotatably mounted and with which the pallet runs on rails along the track, the pallet can be raised or displaced by the drive device in the sense of separating the positioning device. In the case of such a self-propelled pallet, the narrow path of which the pallet moves can namely completely Be passive and only needs to contain corresponding de running rails on which the rollers run. This also enables maintenance personnel to walk on the track and thus a more compact one Arrangement of the workstations. In addition, the self-propelled pallet can easily return to an abandoned or skipped workstation.

A very exact positioning of the pallet is achieved when the rollers are in the respective Station of fixed pallet are out of engagement with the associated rails and so are the positioning can not affect.

For the spatial structure of the transfer machine, there are essentially two basic

different designs in question: the transfer machine can either enable an essentially linear movement of the pallet,

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or it can, if the space conditions dictate, make a circular movement of the Be laid out on the pallet. In the former case, the pallet advantageously contains the whole four rollers, two of which are arranged coaxially and non-rotatably connected to one another, while the roles on a total of two parallel rails running next to each other walk along. It is understood that this arrangement Can also be used when the palette is along an arc with proportionately large radius runs. In the second case, the pallet contains a total of two in the area of Rollers arranged at the front edge, which run along the track on a circular rail, while the pallet has three degrees of freedom in the area of its rear edge stationary central warehouse is supported, which is concentric to the circular Rail is arranged.

In both cases, the roles can have the shape of a double truncated cone and two against each other axially displaceable, frustoconical, non-rotatably interconnected disks, one of which is fixed in the pallet and the other is axially displaceable, each after the two conical disks of a roller have been positioned, the positioning devices are in engagement with one another stand while the rollers are free from the rails or vice versa. There will be a sticking

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Avoid dirt in the rails if they have a gable roof-shaped cross-section have, while the two conical disks of each role with their respective small Face each other, with the conical disk facing the rear edge of the pallet is fixedly mounted in such a way that when the two conical disks move towards one another each role the pallet executes an oblique upward movement and the Positioning device is separated.

A simple mounting of the conical disks results when the stationary mounted conical disk carries a hub axially secured in a corresponding bearing bore of the pallet, which has a Contains through-opening with internal teeth, through which a complementary external toothing carrying longitudinally displaceable push rod through which the secured to the other conical pulley belonging to the respective rollers rotatably with a corresponding internal toothing sits while the push rod is coupled to a linear drive via a vortex bearing is.

In order to maintain the simplicity of the path of the transfer machine, the index pin is advantageous guided in the vertical direction longitudinally displaceable in a hole in the pallet, while its bevel surfaces point in the direction of the front edge of the pallet, thereby simultaneously achieved is that when the

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Index bolt in the direction of the associated recess attached to the tap, the pallet is displaced backwards so that the visual surfaces of the positioning device come into engagement with one another. ; ^- namely 7enn the sheaves in the sense of lowering the pallet into the respective working station auseinanc.erqeschoben, the inclined surfaces of the positioning means to remain at a predetermined distance to each other, since in the last part of the axial travel of the movable conical disc, this Keaelscheiöen freigekqnunen each role already from the rail sides and the stationary conical pulleys no longer generate any horizontal force components on the running surfaces of the rails.

In the case of the circular design, the central warehouse is designed for the pallet so that it can be rotated around the vertical axis (azimuth angle), around the The horizontal axis can be pivoted (elevation angle) and can be displaced to a limited extent relative to the vertical axis is, so that a proper separation of the positioning devices and moving on to the next workstation is possible. The pivoting movement comes, as before, by moving towards one another of the conical pulleys of each role, which with this movement on the flanks of the gable-roof-shaped rail profile upwards slide. The azimuth movement, on the other hand, occurs when the rollers are driven by the associated drive motor be driven in rotation.

While with the circular transfer machine the positioning device only has two horizontal bearing surfaces in the area of the

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Need to have the front edge of the pallet, as the rear end of the pallet in the central warehouse is held at the correct height, the positioning device contains the pallet with four rollers a total of four support surfaces and two inclined surfaces, with the index bolt in the area of the leading edge on the middle between the two the front edge adjacent bearing surfaces is arranged.

Another embodiment of the circular Instead of the rail with the shape of a gable roof in the profile, the transfer machine contains a rail with the shape of a desk in the profile Rail. The pallet therefore contains a total of two in the area of its front edge mounted rollers, which are circular and desk-shaped in cross-section Run the rail along the track, while a two in the area of the rear edge of the pallet A fixed central warehouse is provided which has degrees of freedom and is concentric to the circular rail is arranged. The roles consist of accordingly just a frustoconical disc, again - as before - the cone angle of the discs is adapted to the inclination of the running surface of the rail.

The two rollers are used to lift the pallet, i.e. to separate the positioning devices axially displaceable so that when moving! the rollers in a first position the stop surfaces the positioning devices are out of action,

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while in the case of rollers located axially in a second axial position, for example in the direction of the central axis displaced rollers, these have come free from the running surface of the rail.

The rollers are expediently non-rotatable and axially secured, coupled with a push rod, which is connected to a linear drive via a Wifbellager is connected so that the rollers are driven in rotation and moved within the pallet can.

Since in this embodiment of the pallet or the central bearing there is no axial displacement movement the pallet is possible to engage inclined surfaces of the positioning device with one another to be able to forcibly hold down the range of index bolts in the The pallet is preferably mounted so that it is longitudinally displaceable in the radial direction on the axis of rotation of the central warehouse, with its bevel surfaces facing up.

In the drawing, exemplary embodiments of the subject matter of the invention are shown. Show it:

1 shows a transfer machine according to the invention, in an end view,

FIG. 2 shows the transfer machine according to FIG. 1, in a top view,

3 shows the pallet of the transfer machine according to FIG. 1, in a perspective view from below,

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FIG. 4 shows the pallet of the transfer machine according to FIG. 1, with partially broken away side wall to illustrate the storage of the rolls, in a position positioned in a work station not illustrated further,

FIG. 5 shows the pallet in a representation corresponding to FIG. 4, but in the raised state, with resting on the running surfaces of the rails Roll,

Fig. 6 the vortex bearing and the linear drive for the pull rod for moving the left Conical pulleys of the rollers according to FIGS. 4 and 5,

7 shows a section through the mounting of the rear conical disk along the line VII-VII according to FIG Fig. 5, in a detail view,

8 shows the pallet according to FIGS. 4 and 5, in a side view, with further broken away Wall parts and cut in the area of the index bolt,

Fig. 9-11

the lower end of the index bolt according to FIG. 8, in a view from the front, from the side or a top view,

Fig. 12 the interaction of the index bolt according to Fig. 8 with the associated recess provided in the area of the web, in a perspective view Depiction,

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13 shows a transfer machine according to the invention, in a plan view,

14 shows the pallet of the transfer machine according to FIG. 13, cut in the area of the index bolt, with housing parts partially broken away, in a side view,

15 shows the pallet of the transfer machine according to FIG. 13, as well as the central warehouse, in an axial section,

16 shows the casting device of the central warehouse according to j FIG. 15, in a plan view, I.

17 shows a transfer machine according to the invention, with a circular pallet movement and a pent roof-shaped rail, in a plan view, <

18 shows the pallet of the transfer machine according to FIG. 17, cut in the area of the index bolt partially broken away side walls, in a side view, and

19 shows the intermediate piece for connecting the central warehouse according to FIG. 15, with a pallet according to FIG. 17, in a plan view.

Copy

1 and 2, a transfer machine 1 is illustrated, which is arranged along a path 2 Has work stations 3 with rotary-driven tools 4. Lane 2 contains two parallel im Distance from one another, gable roof-shaped rails 5 and 6, on which one Pallet 7 runs along by means of rollers 8,9,11,12 rotatably mounted in the pallet 7, as it does can be seen in the perspective bottom view of FIG. The pallet 7 carries on her Top a feed device ^, the two attached to the top of the pallet 7 and parallel spaced guide rails 14 and 15 and one on the Guide rails 14 and 15 longitudinally displaceably guided table 16 contains. The table 16 carries Clamping devices, not further illustrated, for a workpiece 17 anchored on the table 16, that is to be processed in the transfer machine 1. The guide rails 14 and 15 run at right angles to the 'rails 5 and 6 of track 2, so that the table 16 at right angles to the rails 5 and 6 in the direction of the respective work station 3 or its tools 4 can be delivered, for which purpose the table 16 is correspondingly positively driven.

At the rear of the pallet 7, i.e. that side of the pallet 7, the tools 4 of the Work stations 3 facing away, a gear housing 18 is attached to the two electric motors 19 and 21 are flanged, one of which is used as a feed motor to drive the table 16 and the other as a traction motor to drive the

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Rolls 8, 9, 11 and 12 are used. On the side next to the table 16 is on the pallet 7 still a control device 22 with which the Electric motors 19 and 21 and other fluid drives to be described later are automatic be controlled for workpiece machining; the power supply for the drive motors 19 and 21 as well as the control device 22 and the print medium supply is for the sake of clarity not further illustrated and can be done, for example, via towing cables or towing hoses, it is also possible to provide a pressure vessel in the control device 22, which is charged before each work cycle when loading the pallet with the workpiece 17 and for the The subsequent work cycle of the fluid drives supplies the necessary energy.

With reference to FIGS. 3 to 6, the storage of the rollers 8 to 12 in the pallet is now shown in detail as well as the operation of the roles 8 to. 12 described. As FIG. 3 shows in particular, are the four rollers 8-12 are each arranged in pairs coaxially, the rollers 9 and 12 in near the front of the pallet 7, i.e. near those facing the workstations 3 Side, and the rollers 8 and 11 are located near the rear of the pallet 7, so that if the pallet 7 is placed on the track that is fixedly connected to the stations 3, the rollers 9 and 12 on the rail 5 adjacent to the work stations 3 and the rollers 8 and 11 on the run along the rail 6 remote from the workstations 3. Have roles 8-12,

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as particularly FIGS. 4 and 5 show, approximately the shape of a double truncated cone, wherein the cone angle of the rollers 8 - 12 at the angle of the running surfaces of the rails 5 and 6 is adapted so that the rollers 8 12 as possible over the length of their entire Mante.L-line run along on the two mutually angled running surfaces 22 and 23, which are wider than the thickness of the conical disks 24, 25 or 43, 44. To reduce friction, it is advantageous to to make the conical disks 24, 25 or 43, 44 or the running surfaces 22, 23 slightly convex.

The two roles 8 and 11 exist, as shown in FIG Figures 5 and 5 show two frustoconical disks

24 and 25, which face each other with their smaller base area and axially against each other are movable. To the conical disk

25, a coaxial hub 26 is formed in one piece, which is at right angles to the rails 5 and 6 extending sleeve 27 is rotatably mounted.

The sleeve 27 is inserted in a corresponding through hole 28 in a side flange or Extension 29 of the pallet 7, namely the hub 26, starting from the associated conical disk 25, towards the rear of the pallet 7. On the protruding from the sleeve 27 end of the Hub 26 is seated by a spur gear 31 which is non-rotatably connected to hub 26 by means of a feather key 32 is and axially by a snap ring 33 seated in a corresponding groove in the hub 26 is secured so that the spur gear 31 between the snap ring 33 and the outer Front side of the sleeve 27 is set. About the spur gear 31 and others, for clarity Countersunk gears that are not illustrated, for example countersunk gear 34, is gear-driven Connection between the hub 2 6 and thus the

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Conical pulley 25 and the drive motor 21 made. The hub 26 contains a through hole 3 5 with an internal toothing 36 running in the axial direction, as the sectional view from FIG. 7 shows. Through the bore 35 of the hub 26 carrying the internal toothing 36, a push rod 37 extends which an external toothing 38 which is complementary to the internal toothing 36 and is thus non-rotatable, however is coupled to the hub 26 so as to be axially displaceable.

On the external toothing 38 of the push rod 37 the second conical disk 24 of the roller 11 is seated in a rotationally fixed manner, namely the conical disk 24 is through two locking washers 39 and 41 seated in corresponding grooves on the push rod 37 axially fixed; so that the locking washer 39 the juxtaposition of the two smaller base areas the conical pulleys 24 and 25 not obstructed, the conical pulley 25 carries on its the Conical disk 24 adjacent end face has a corresponding recess 42 in which the locking ring 39 can disappear. The locking ring 41 is relatively large and dimensioned consists, for example, of two ring halves screwed together so that it is able to with reference to FIGS. 4 and 5, to transmit right-directed axial force to the conical disk 24.

Just like the roller 11, there is also the roller 12 from two conical disks 43 and 44, which have the same dimensions as the two conical disks 24 and 25, with one of the conical disks,

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namely the conical disk 24, is fixedly mounted in the pallet 7, while the conical disk 43, similar to the conical disk 24, is axially displaceable. The pallet 7 contains for this purpose, in the area of its front side 10, a flange 45 which has a bore that is aligned with the bore 28 46 contains, in which a bushing 47 aligned with the bushing 27 is inserted. The sleeve 47 is rotatably supported a hub 48 which integrally adjoins the rearwardly facing base or end face of the conical disk is molded. As before with the hub 26, the hub 48 also includes a through hole 49 with a axially extending internal toothing 36 through which the push rod 37 passes with its external toothing 38, whereby a non-rotatable connection between the conical disk 44 and the push rod 37 and thus also a non-rotatable connection with the spur gear 31 is created. The conical disk 43 is designed in the same way like the conical disk 24 and is as free of play as possible by two retaining rings 51 and 52 axially secured held on the push rod 37; the locking ring 51 can - as previously in a concentric recess 53 of the conical disk 4 4 disappear, so that the two conical disks 43 and 44 with their opposite end faces unhindered to one another can come across. The locking ring 52, like the locking ring 41, consists of two together screwed ring halves, which are inserted into the matching, in the push rod 37 Sit groove.

The protruding from the conical disk 43 end of the push rod 37 is axially displaceable in the

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Front wall 10 of the pallet 7 is stored. For this purpose, the front wall 10 contains one with the bores 28 and 46 aligned bore 53 in which a bearing bush 54 is firmly inserted. In this bearing bush 54, another bush 55 can go back and forth slide and rotate on the end of the push rod protruding from the conical disk 43 attached and through one in the area of the front the push rod 37 is axially secured in a corresponding annular groove seated snap ring 56 is, so that the sleeve 55 between the snap ring 56 and the locking ring 52 of the conical disk 43 is set axially. The inner opening of the sleeve 55 can be either cylindrical or it can be an internal toothing corresponding to the internal toothing 36 of the hubs 48 or 26, so that it is held in a form-fitting manner on the push rod 37.

On the back of the pallet 7 in the extension of the push rod 37 is an actuating device 57 flanged, with which the push rod 37 can be moved in the axial direction. The actuating device 57 contains a pot-like, attached to the pallet 7 by means of screws 58 and 59 flanged cylindrical guide 61, in which with the push rod 37 aligned cylindrical bore 62, a guide carriage 63 is mounted axially displaceably opposite the the guide 61 is secured against rotation. For this purpose, the carriage 63 träcrt in a groove

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Outer peripheral surface one running in the axial direction Feather keys 64, which also run in a corresponding axial direction of the guide 61 Groove 65 can slide back and forth. Inside the slide 63 there is a vortex bearing consisting of two against each other braced tapered roller bearings 65 and 66, which are in alignment with the push rod 37 and Sitting in the direction of the push rod open bore 67, between a collar 68 of the Bore 67 and a screw ring 69 screwed into the bore 67 are held. Through the aligned bores of the inner races of the two tapered roller bearings 65 and 66 leads through a cylindrical extension 71 of the push rod 37 and carries out on his the end protruding from the two tapered roller bearings 65 and 66 has a thread 72 onto which a fastening nut 73 is screwed on, by means of which the push rod 37 is axially secured to the inner races of the two tapered roller bearings 6 5 and 66 is connected. From the end face 74 opposite the push rod 37, one leads Piston rod 75 flanged to guide 61 as an extension of push rod 37 and fluid drive 76 acting in both directions, for example a double-acting hydraulic or hydraulic drive a double-acting pneumatic cylinder, in the cylinder chambers of which the abbreviated ones are indicated Pressure medium lines 77 and 78 open.

The structure, the lacreruna and the drive of the others in '

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Tapered rollers 8 and 9 is exactly as it is described for the two rollers 11 and 12, wherein These rollers 8 and 9 also contain their own push rod 3 7, which is connected to one of the actuating devices 57 corresponding actuating device can be moved. Also at These roles are prevented by the rotating face, longitudinally guided carriage 63 in conjunction with the tapered roller bearings 65 and 6 6 a torque transmission from the push rod rotating with the rollers 8-12 37 onto the piston rod 75 and thus onto the fluid drive 76.

For the correct height positioning of the pallet 7 in the respective or in front of the respective work station 3 are on the underside of the approximately rectangular pallet 7 four downward flat stop surfaces 81,82,83 and 84 are provided, all in the same to the track parallel plane and are arranged approximately in the four corners of the pallet 7, i.e. the Stop surfaces 81 and 83 are in the area of the front wall 10, while the stop surfaces 82 and 84 are formed near the rear of the pallet 7. These stop surfaces 81 -

84 act with corresponding stop surfaces

85 - 88 together, which are fixedly attached in front of each station 3 on the track 2 and likewise lie as plane surfaces in a common plane. The arrangement of the stop surfaces 85 88 corresponds to the arrangement of the stop surfaces 81-84.

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To also the pallet 7 in front of the respective work station 3 on the web 2 in the feed direction of the • Define table 16, i.e. in order to prevent the pallet 7 from being pushed forward by the workpiece 17 against the tools 4 of the respective work station 3 in the opposite direction, are provided on the front wall 10 of the pallet 7 two inclined surfaces 91 and 92, which the planar stop or Support surfaces 81 and 83 are adjacent. the Projection of the surface normal of the two flat inclined surfaces 91 and 92 onto the surface through the stop surfaces 81-84 defined plane runs parallel to the direction of advance of the table 16, the However, inclined surfaces 91 and 92 are inclined so that their lower edge is closer to the center of the pallet 7 stands as its upper edge, as the figures show. The inclined surfaces 91 and 92 cooperate corresponding complementary inclined surfaces 93 and

94 together, which are attached to the stop surfaces 85 and 86 of the web 2, wherein in Fig. 5 the Inclined surface 93 and in Fig. 8 the inclined surface 94 can be seen.

Fig. 3 shows that approximately in the middle between the two front rollers 9 and 12 an index bolt

95 protrudes from the underside of the pallet 7. The cylindrical index bolt 95 is inserted, as in FIG. 8 shows, in a vertically extending cylindrical bore 96, which is in the vicinity of the front wall 10 of the Pallet 7 is attached. In its upper area, the index bolt 95 contains a relative to it

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Continuous opening 97 running obliquely in the longitudinal axis and approximately rectangular in cross section,
the flanks of which run parallel to the longitudinal axis of the index bolt 95. Due to the rectangular
Opening 97 runs a slider 98 whose inclination is matched to the incline of opening 97,
the one at his front and his back
End, ie at the two from opening 97
protruding ends, each merges into a cylindrical section 99 and an aligned cylindrical section 101. The two cylindrical sections 99 and 101 have the same diameter and are guided longitudinally displaceably in a bore 102 running at right angles to the longitudinal axis of the index bolt 95 and extending in the pallet 7 in the direction parallel to the feed direction of the table 16, during the the inclination of the opening 97 adapted slide 98 in the bore 102 is correspondingly inclined, as FIG. 8 shows. The slide 98, together with the opening 97 running transversely through the index bolt 95, forms a wedge gear which can be actuated by a fluid drive 103 arranged in the pallet 7. For this purpose, the fluid drive 103 is seated on an extension of the bore 102
Flange 104, while two pressure medium lines
105 and 106 of the supply of the printing medium to the
Fluid drive 103 are used. The piston of the fluid drive 103, which is a double-acting
Can be pneumatic cylinders or hydraulic cylinders,

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is connected to the cylindrical section 101 of the slide 98 via a piston rod 108.

Around the slide 98, which merges in one piece into the cylindrical sections 99 and 101, into the opening 97 of the index bolt 95 can be used, the index bolt 95 includes a cap 109 that the Opening 97 closes off at the top, an extension 111 of the cap 109 protruding into the opening 97 and forms its sloping top wall. The cap 109 is indicated schematically by means of Screws 112 and 113 screwed onto the upper face of the index bolt 95.

Is by supplying pressure medium to the fluid drive 103 actuates the piston and thus the piston rod 108, the shifts from the cylindrical sections 99 and 101 in the bore 102 guided slide 98 in a horizontal Direction, what because of its upper and lower inclined surface, which are against the longitudinal axis of the index bolt 95 is inclined to a displacement of the index bolt 95 in the longitudinal direction leads. Since the slide 98 is fitted into the opening 97 largely without play, and both with their lower surface and their upper boundary surface or wall interact, there is a positive drive of the index bolt 98 and a pressure safety device by the slide 98.

At its end that can be pushed out of the pallet 7 downwards, the index bolt 95 carries

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two directly adjoining, flat bevel surfaces 114 and 115, which with one another enclose an angle of about 90 ° and are formed so that their common edge 116, on which the two bevel surfaces 115 and 114 abut one another, runs obliquely to the longitudinal axis of the index bolt 95, namely so that the extension of the edge 116 is the longitudinal axis of the index bolt 95, based on the illustration in FIG. 8 or in FIG. 10, outside and cuts below the face of the index bolt 95.

In order to prevent the index bolt 9 5 in the associated bore 96 around one along the wall the straight line running through the bore 96 can rock, the index bolt is on ' that of the two bevel surfaces 114 and 115 opposite Side flattened at 120 so that when a force is applied to the chamfer surfaces 114 and acts, rests at least along two lines on the wall of the bore 96.

With the bevel surfaces 114 and 115, two complementarily shaped bevel surfaces 117 and act 118 together, which are shown in Fig. 12 and formed on a stop block 119, as he in the area of each work station 3 on the web between the stop surfaces 85 and 86 by means of Screws 121 and 122 is attached. The one formed by the two stop surfaces 117 and 118 The recess opens in the direction of the rail 5, i.e. in the direction

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on the center of the pallet 7, while the edge 116 of the index bolt 95 to the front wall 10 shows.

The transfer machine 1 described so far works as follows:

It is assumed that on the table 16 of the feed device 13 a workpiece 17 is clamped in the correct position. The table 16 is on the guide rails 14 and 15 in its rearmost position, in which the workpiece 17 is furthest from the tools 4 is removed. The hydraulic drive 76 is operated by the control device 22 so that that the push rod 37 is also in its most retracted position, in the conical disks 24 and 25 or 43 and 44 of each of the four rollers 8-12 close to one another as shown in FIG. 5. Furthermore, the index bolt 95 is in the retracted position Position, which is achieved by appropriate actuation of the slide 98 by the fluid drive 103 is reached so that the index bolt 95 no longer protrudes from the underside of the pallet 7 protrudes.

In this operating position, the pallet 7 can be moved freely along the path because the pallet 7 now rests on the rails 5 and 6 by means of its rollers 8-12, while the stop surfaces 81 84 on the underside of the pallet 7 are lifted upwards from the stop surfaces 85 - 88 of the web 2,

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while at the same time the inclined surfaces 91 and 92 of the pallet 7 from the inclined surfaces 93 and 94 of the web 2 have come free, since the pallet 7 is correspondingly forward in the direction are advanced on their front wall 10 or on the workstations 3, as this can be seen from Fig. 5 results. If now the drive motor 21 of the controller 22 switched on to the pallet 7 from the loading station to the first work station to bring, the spur gear 31 begins via the intermediate gear Rollers 11 and 12, as well as the spur gear 31 of rollers 8 and 9 to rotate, causing the conical pulley 25 of rollers 8 and 11 to rotate is moved. Because of the positive coupling of the hub 26 with the push rod 37 also begins these to run around and accordingly the conical disk 24 of the push rod 37 Rollers 8 and 11 and the conical disks 43 and 44 of the two rollers 9 and 12 are driven. All rollers 8 to 12 are coupled to traction motor 21 via the push rod 37. Once the pallet 7 is in this way on the rails 5 and 6 in the approximately correct Position in front of the first workstation 3 is driven, what the control device 22 by detects corresponding position switch, not shown in the figures, the traction motor

21 stopped and the pallet 7 comes to a standstill. Now the control device

22 of the fluid drive 76 set in motion, in such a way that the piston rod 75 in the direction of the

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COPY

Front wall 10 of the pallet 7 is moved. This pushing movement is over the slide 63 and the two tapered roller bearings 65 and 66 also, the push rod 37 of the two sets of rollers 8,9; 11, 12 moved in the direction of the front wall 10 and with it the conical disks axially secured on it 24 and 43 of rollers 8-12; the conical disks 25 and 44 are in the pallet 7, however stored in a stationary position and maintain their position in the pallet.

Since the two conical disks 24 and'25 or 43 and each of the rollers 8-12 can be separated from one another by the push rod 37, as a result of this from above acting weight of the pallet 7 the flanks of the conical disks 24,25, 43 and 44 on the at the same angle inclined running surfaces 22 and 23 of the rails 5 and down, making the pallet 7 also downwards, i.e. in the direction of web 2. But because the back one Conical disk 25 and 44 of the rollers 8 to 12 is fixedly mounted in the pallet 7, arises when the conical disks 24, 25, 43, 44 slide down on the running surfaces 22 and 23 of the rails 5 and 6 in addition to the vertically directed movement also a horizontally directed movement, which runs parallel to the direction of advance of the table 16, so that not only the Bring the stop surfaces 81-84 of the pallet 7 closer to the stop surfaces 85 - 88 of the track 2, but also the inclined surfaces 91 and 92 approach the inclined surfaces 93 and 94.

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Since the axial movement of all conical disks 24 and 43 of the rollers 8-12 synchronously with each takes place the same range of motion, the pallet 7 is lowered evenly. As soon as the conical disks 24,25 or 43,44 of each roller 8-12 far enough in the axial direction of- have removed from each other, the pallet 7 lies with its stop surfaces 81-84 on the respective associated stop surfaces 85-88 of the web 2, while the inclined surfaces 91 and 92 are still at a certain small distance from the stop surfaces 93 and 94. the However, axial movement of the push rod 37 continues beyond this point as long as to the axially movable conical disks 24 and 43 from the associated running surface 22 of the Rails 5 and 6 are completely free. Only now is the further advance of the fluid drive 76 stopped by the controller 22. This can also be done in that the piston in the fluid drive 76 starts up against a corresponding stop.

As soon as this position of the pallet 7 is reached on the track, the control device the fluid drive 103 is set in motion and the piston rod 108 is advanced, which leads to the horizontally guided slide 98 pushes the index bolt down on the pallet 7 in the axial direction, the moment of reaction from the cylindrical sections 99 and 101 in the bore is recorded. In the course of this lowering movement of the index bolt 95, its chamfer surfaces arrive

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114 and 115 into the chamfer surfaces 117 and 118 limited recess of the stop block 119 and come into engagement with these surfaces. The further advancement of the index bolt 95 causes the pallet 7 to be pushed back in the direction opposite to the feed direction, because the chamfer surfaces 114 and 115 stand forward and support themselves on the chamfer surfaces 117 and 118 of the stop block 119. This backward sliding movement of the pallet 7, i.e. its stop surfaces 81 84-up the stop surfaces 85 - 88, takes place until the index bolt is advanced 95 the inclined surfaces 91 and 92 come to rest on the inclined surfaces 93 and 94.

Because of the inclination of the inclined surfaces 91 and 92, the can be pushed forward with appropriate force Index bolts 95 do not lift the pallet from its front stop surfaces 81 and 83, because through the inclined surfaces 91 and 92 at the same time a downward force component is generated on the pallet.

Climbing up of the pallet 7 on the index bolt 95 is thus effectively avoided, especially since the index bolt 95 in the immediate vicinity of the stop surfaces 31 and 83 or the inclined surfaces 91 and 92 protrudes from the pallet and is the center of gravity of the pallet 7 is in any case far behind the index bolt 95 and the inclined surfaces 91 and 92, so that the lever arm of index bolts 95 to the inclined surfaces 91 and 92 is much smaller than the lever arm of the Inclined surfaces 91 and 92 to the center of gravity.

Because the advancing index bolt 95 is located on the chamfer surfaces 117 and 118

the stop block 119 is supported and the pallet 7 moves backwards, come also the conical disks originally still resting on the running surfaces 23 of the rails 5 and 6 25 and 44 of the rollers 8-12 free, so that finally all conical disks 24,25, 43 and 44 with their flanks no longer the running surfaces 22 and 23 of the rails 5 and 6 touch and hinder the correct height positioning of the pallet 7. Also causes the arrangement of the index bolt 95 on the Middle between the two inclined surfaces 91 and 92, that when the index bolt 95 is advanced, both stop surfaces are certain 91 and 92 with the associated stop surfaces 93 and 94 come into engagement and a possible angle error between eliminate the feed direction of the table 16 and the working direction of the station 3, in that the pallet 7 is then approximately around the inclined surface 91 or 92 which is applied first rotates around a vertical axis.

Finally, a possible positioning error of the pallet, measured in the longitudinal direction the track, fixed by the index bolt, which can result from the Control device 22 stops the pallet 7 too early or too late, for example caused by different moments of inertia of the pallet The two bevel surfaces 114 and 115 cause also that the pallet 7 is moved in the longitudinal direction parallel to the rails 5,

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333267 «

until the index bolt 95 with its chamfer surfaces 114 and 115 exactly between the Chamfer surfaces 117 and 118 of the stop block 119 is when - as in the illustrated embodiment - the inclined surfaces 91 and 92, like the inclined surfaces 93 and 94, lie in a common plane that is parallel runs to the rails 5 and 6.

After the pallet 7 is in the correct position in this way in front of the respective work station 3 on the web is positioned, the machining of the workpiece 17 can begin, including by the control device 22 the feed motor 15 is set in motion, which is via a corresponding, not shown further Gear a feed spindle 123 running in the feed direction offset in revolutions, which is part of a ball screw drive with which the table 16 on the guide rails 14 and 15 in the direction of the tool 4 of the respective workstation 3 is advanced. The nut of the recirculating ball screw drive is in 8 is illustrated in dashed lines at 124 and is firmly connected to the table 16.

Even when the workpiece 17 is being machined, the inclined surfaces 91 and 92 have an automatic effect Holding down the pallet 7 and prevent so effectively that the pallet 7 during the machining of the workpiece 17 of the Stop surfaces rise, because the reaction torque of the feed force is generated on the inclined surfaces 91 and 92 a downward one

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Force component that 'in the area of the front wall attacks on the pallet 7. On the stop surfaces and 88 is the pallet 7 from its own weight and the tilting moment around the inclined surfaces 91 and 92 when immersed of the tool 4 ′ is held in the workpiece 17.

As soon as the machining process of the workpiece is completed, the control device continues the feed motor 19 in the opposite direction of rotation in operation, and the table 16 of the feed device 13 is withdrawn from the tool 4 by the ball screw 123, so that on the one hand the workpiece 17 comes free again from the tool 4 and the pallet 7 a sufficient Clearance profile under / in front of tool 4. When reaching such a position of the table 16, the control device 22 stops the feed motor 19 and now actuates the fluid drive 103 of the index bolt 95, but in the opposite direction as before, namely so that the piston rod '108 is withdrawn, whereby the index bolt 95 on the, as in Fig.8 shown, inclined slide 98 rises and is withdrawn into the pallet 7. The index bolt is thus pulled out of the stop block 119. The end position of this movement can turn be defined by applying the piston of the fluid drive. The control device then switches 22 the fluid drive 76 of each of the two pairs of rollers 8,9, 11,12, whereby the push rod 37 is moved to the right, around the two conical disks 24 and 25 or 4 3 and 44 of each roll 8-12 to approximate each other, which happens simultaneously. Through this approach The flanks of the conical disks 24, 25, 43, 44 come with the running surfaces. 22 and 23 of the Rails 5 and 6 engage and rise at

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continued movement of the push rod 37 on the running surfaces 22 and 23 gradually above. The relative movement between the two conical disks 24, directed towards one another, 25 or 43,44 of each roller 8-12 generates an upward movement that the Pallet 7 with its stop faces 81 - 84 from stop surfaces 85 - 88 of track 2 takes off. In addition, since the rear conical disk 25 and 44 of the rollers 8-12 is fixedly connected to the pallet 7, causes the relative movement between the conical disks, driven by the push rod 37 and the fluid drive 76, one in the feed direction directed movement of the pallet 7, the stop surfaces 91 and 92 of the Stop surfaces 93 and 94 separate. The two superimposed directions of movement of the pallet 7 thus result in one Movement directed obliquely upwards towards the respective workstation 3. When to At the end of this process, the two conical disks 24, 25, 43, 44 of each of the rollers 8-12 again lie on top of one another, as shown in FIG. 5, the pallet is again, as at the beginning, free on the Rails 5 and 6 of the track 2 are movable and can by starting the drive motor 21 to go to the next workstation 3, at which the cycle just described is repeated, 4 and 8 illustrate the state when the pallet 7 is lowered, while in Fig. 5 the raised and freely movable pallet 7 is shown.

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13 to 16 is a further embodiment illustrates a transfer machine in which, in contrast to before, the pallet 7 instead of a linear movement a circular motion as you progress from workstation to workstation a fulcrum located under the pallet 7 performs. As far as this transfer machine 1 contains the same components as the transfer machine described above, are in the 13 to 16 use the same reference numerals and no longer repeat the corresponding components described.

On the circular in this embodiment Lane 2, around which a total of three work stations 3 are each offset by 90 ° are arranged, a rail 5 is concentric to the track with, as before, gabled roof-shaped Cross-section attached. The pallet is in the vicinity of its rear end, i.e. in the area of the gearbox 18, in a central bearing 150 arranged concentrically to the rail 5, while the The front end of the pallet 7 is guided by means of two rollers 9 and 12 corresponding to the rollers is, of which in Fig. 14 only the role because of the sectional view is illustrated in sections. The two rollers 9 and 12 rotate about axes that do not are arranged axially parallel as before, but which intersect in the area of the central warehouse 150; otherwise is their storage and their drive

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designed exactly as described in detail in connection with the rollers 9 and 12 in the previous exemplary embodiment. The same applies to the feed _{device 13 f} as well as the drive motors and the in.Fig. 13 control device 22, not shown further.

The central bearing 150, which is arranged concentrically with respect to the rail 5, is provided via struts extending approximately in the shape of a star 151 firmly connected to the track 2 and contains a hub 160, in the bore 152 two tapered roller bearings 153 and 154 are used. The tapered roller bearing lies with its outer ring on a radially in the bore 152 protruding collar 155, on which the outer bearing ring of the tapered roller bearing 154, however from below. By both of them aligned with each other Tapered roller bearings 153, 154 run a pivot 159, the axis of rotation of which is coaxial with the rail 5 and which rests with a collar 161 on the inner race of the upper tapered roller bearing 153. Below of the tapered roller bearing 153 includes the one tightly fitted into the inner race of the tapered roller bearing 153 Trunnion 159 has an external thread 162, the outer diameter of which is smaller than the clear way of the inner barrel rings of the two tapered roller bearings 153 and 154. A ring nut is attached to this external thread 162 163 screwed onto the inner race of the lower tapered roller bearing 154 is supported and by means of which the two tapered roller bearings 153, 154 are free of play against one another are tense. The bore 152 is closed on the underside by a cover 164, which is connected to the hub 151, for example by appropriate screws.

copy _ ₄₈ _

At its upper, protruding from the hub 160 End of a radially projecting flange 165 is formed on the pivot pin 159, from which a Flat edge 166, as illustrated in Fig. 16, protrudes axially. The flat edge 166 is coaxial to the pivot 159 and has two mutually parallel flanks or side surfaces 167 and 168. on which is parallel to the vertical axis of the pivot 159 run. On the upper side of the flange 165, which is planar apart from the flat edge 166 lies an approximately cuboid sliding piece 169 with a flat top 171 and a flat bottom 172 on, the flat edge 166 through a correspondingly shaped rectangular opening 173 in the sliding piece 169 reaches through. The opening 173 has a width which corresponds to the distance between the two flat sides 167 and 168 correspond to each other while the length the opening 163 is larger than the longitudinal extension of the flat edge in the horizontal direction, so that the sliding piece 169 with its underside 172, resting on the flange 165, in the direction of a Double arrow 174 is displaceable.

A cover plate 175 is provided on the end face of the flat edge 166 protruding from the sliding piece 169 four screws 176 fastened, which are screwed into the flat edge 166.

In the area of the central warehouse 150, two lugs 183 and 184 protrude from the underside of the pallet 7, which run parallel and at a distance from one another and both of the longitudinal axis of the pallet 7 are the same Have a distance. Both extensions 183 and 184 each contain one extending in the horizontal direction Cross hole 185 and 186, which are made so that they are flush with each other and at right angles to the longitudinal

- 49 COPY

axis of the pallet 7 run. In these Pucrbohrunaen 185 and 186 sit axially secured collar bolts and 188, in their opposite end faces a blind hole 189 or 191 is attached. Put 189 and 191 in these blind bores the pivot pins 181 and 182 of the sliding piece 169. The collar bolts 187 are, for example, in the extensions 183 and 184 screwed in screws 190 axially secured.

In this way, a central warehouse 150 is achieved which has a total of three degrees of freedom. This is because it allows the pallet 7 to rotate about concentrically to the rail 5 running vertical axis, a pivoting movement around a 'horizontal axis, that around the vertical axis can revolve and also a translational movement in the direction of the double arrow 174, i. parallel to the direction of advance of the table 16.

Since in the embodiment according to FIGS. 13 to 16, the pallet 7 in the area of the central warehouse 150 is mounted at the correct height, it is sufficient if it is only in the area of its front side 10 the stop surfaces 81 and 83 and the inclined surfaces 91 and 92, while the rear Stop surfaces 82 and 84 are omitted. Accordingly, there are only 2 on track the stop surfaces 85 and 86 with the inclined surfaces 93 and 94 are present in the area of each work station 3 are attached to the track 2. Between the two stop surfaces 85 and 86 there is a stop block 119, which is connected to the in the area of Front wall 10 in the pallet 7 vertically displaceably mounted index bolts 95 cooperates. the The arrangement of the index bolt 9 5 is identical to the structure as in the first exemplary embodiment.

The function of the transfer machine 1 according to the 13 to 16 will now be explained in the following: If the two conical disks 43 and 44 of the rollers 9 and 12 are pushed apart via the push rod 37 by means of the fluid drive 76, the pallet 7 of the transfer machine gradually descends on the stop surfaces 85 and 86, the pallet 7 pivots about the pivots 181 and 182. As soon as the the two conical disks 43 and 44 are pushed far enough apart, the pallet 7 lies with their stop surfaces oil and 83 on the associated stop surfaces 85 and 86 of the web 2, while they are on their rear End is held by the central warehouse 150. Simultaneously with the swivel movement around the Pivots 181 and 182 makes the pallet 7 a sliding movement in such a way that their front wall 10 moves in the direction of the vertical axis of the central warehouse 150, which is through the in the opening 173 displaceable flat edge is made possible.

As soon as the conical disks 43 and 44 are far enough apart, the pallet 7 lies with their stop surfaces 81 and 83 on the stop surfaces 85 and 86, while at the same time the inclined surfaces 91 and 92 have approached the inclined surfaces 9 3 and 94. if Now the index bolt 95 is advanced by the fluid drive 103, the bevel surfaces come 114 and 115 of the index bolt 95 with the bevel surfaces 117 and 118 of the stop block 119 into engagement, whereby the inclined surfaces 91 and 92 are tightened on the inclined surfaces 93 and 94 will. The pallet 7 is then in the correct position in front of the respective work

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'-SA- 333267C

Station 3 locked, initially existing slight positional errors in the circumferential direction of the rail 5 can be eliminated by the centering effect of the index bolt 95.

To machine the workpiece 17, the table 16 is mounted on the tools with the aid of the feed motor 19 4. advanced to the corresponding workstation 3 and following processing also withdrawn again. If now the pallet 7 is rotated to the next work station 3 is to be, the index bolt 95 is first withdrawn into the pallet 7, and then the fluid drive 76 is set in motion again in the opposite direction, so that the conical disks 44 and 43 approach one another, as previously described. By this axial approach of the two conical disks 43 and 44 is preferred to the pallet 7, i. the front wall 10 moves away from the vertical axis of the central warehouse 150 and performs at the same time the pallet 7 pivots about that defined by the pivot pins 181 and 182 Horizontal axis. When the pallet 7 in this way from the stop surfaces 85 and 86 of the Lane 2 is free, the drive motor is switched on, and so the rollers 9 and 12 rotated so that the pallet with its rollers 9 and 12 on the rail to the next workstation 3 continues, executing an azimuthal rotary movement.

So that the inclined surfaces 93 and 94 because of the small stroke that the pallet 7 performs, do not rub against the inclined surfaces 91 and 9 2, they can, as shown in FIG. 13 in an exaggerated manner Way represents, under a slight

Angle to each other are arranged so that they are about a running through the inclined surfaces, follow a concentric circle to the central warehouse 150; the inclined surfaces 91 and 92 of the Pallet 7 must then also be arranged at an angle to one another accordingly.

The exemplary embodiment of the transfer machine 1 finally shown in FIGS. 17 to 19 differs from the embodiment according to FIGS. 13 to 16 by a modified one Rail profile ·, as well as a central warehouse 150, which has only two degrees of freedom and a rotational movement of the pallet 7 about the vertical axis and a nodding movement of the pallet 7 around a horizontal axis. Otherwise, the same components are again provided with the same reference numerals and are not described further.

In this embodiment, the rail 5 has a desk-shaped cross section, the running surface 23 hangs in the direction of the central warehouse 150, as can be seen from FIG. The two rollers running on this rail 5 in the area of the front wall 5 of the pallet 7 exist therefore only from a single conical disk 200, which is geared to the traction motor 21 is connected and axially displaceable in the pallet 7.

Rotatable about the frictional slip between the two in the area of the front side 10 of the pallet 7 To minimize the mounted conical disks 200 on the running surface 23 is again the

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3332570

Conical angle of the frustoconical disc adapted to the inclination of the running surface 23, and In addition, the two conical disks 200 rotate about axes in the direction of the vertical axis of the central warehouse 150 converge.

The axial drive of the two shafts 201, of which only one is visible in FIG. 18, can be done as in the first embodiment and therefore does not need to be described again to become.

A central warehouse is used as the central warehouse 150, as shown in FIG only the flat edge 166 is replaced by a cylindrical pin 202 and the thrust piece 169 by an annular disc 203, on the outer circumference of which the two coaxial pivot pins 181 and 182 are attached. The axial section looks in any case as in Fig. 15.

In this exemplary embodiment, however, the index bolt 95 is not vertical but rather horizontal slidably mounted in the area of the front wall 10 of the pallet 7, but otherwise in the same Wise designed and positively driven as previously described. However, now becomes a stop block 204 is required, which cooperates with the chamfer surfaces 114 and 115 of the index bolt 95 Chamfer surfaces delimit a recess that is open radially outwards and at the same time downwards, as shown in FIG. 18.

If in this embodiment the pallet

COPY

is to be rotated about the vertical axis of the central bearing 150, is first of all by the fluid drive 103 the index bolt 95 is retracted radially outward by means of the slide 98 and comes in this way free of the stop block 204. Now, a fluid drive will do the same 6, the shaft 201 advanced, whereby the flank of the conical disk 200 with the Tread 23 comes into engagement. When the shaft 201 is advanced further, the pallet 7 lifted and performs an upward nodding movement around the horizontal axis, defined through the pivot pins 181 and 182. If the drive motor 21 is now started, the runs Pallet 7, driven by the conical pulleys 200, to the respective work station 3 at which the drive motor 21 is stopped. Now will the shaft 201 is in turn withdrawn in the direction of the central warehouse 150, whereby the pallet is lowered onto the stop block 204, but without at the same time a relative to the central bearing 150 to perform radially directed movement, as is the case in FIG.

As soon as the pallet 7 rests, the index bolt 95 is advanced in the direction of the central store 150 by the fluid drive 103 and lays the pallet on the associated stop surfaces.

It is readily apparent that in the inventive Transfer machine also uses workstations 3 with their own feed device can be what a suitably large

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Processing variety of workpieces 17 allows. It is also possible to have a Provide indexing table with the, the workpiece with respect to the table 16 and thus with respect to the Feed direction can be rotated, which may be done automatically by the control device 22 is controlled from.

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Claims (10)

Patent attorneys Dr.-Ing. R. Rüger Dipl.-Ing. H. P. Barth reins. Representative at European Patent Office 3-33267C 300 EssTingen (Necfi Webergasse 3 · P.O. Box 348 ■ 7300 EssTTngen September 9, 1983 TJ 7V O A K 1 Telephone Stuttgart FA / 4 Daal (0711l356539unc35961S Telex 7 256 61 Csmru Telegram Patentscnut2 patent claims Esslmgenneckar MJ transfer machine with arranged along a path and power tool workstations with at least one on the track by means of rollers along a movable pallet, the clamping devices for holding in the correct position of workpieces to be machined in the workstations and by a drive device cyclically from one workstation to the next Work station can be moved further, as well as with positioning devices through which the pallet can be fixed in the correct position with respect to the respective workstation, characterized in that that the ^ range. (7) one of the clamping devices for the workpieces (17) carrying feed device (13) with positive drive (19, 123, 124), through which the workpiece (17) can be delivered to the tools (4) in the respective work station (3). 2. Transfer machine according to claim 1, characterized in that that the feed device (13) fixedly arranged on the pallet (7) guide rails (14,15) and one holding the jig and on the guide rails (14, 15) slidably mounted table (16) through which a drive motor (19) with a gear mechanism is displaceable on the guide rails (14, 15), and COPY that the guide rails (14,15) run at right angles to the path (2) along which the Pallet (7) is movable. 3. Transfer machine according to claim 2, characterized in that that the gear unit contains a screw drive (123,124) and the drive motor (19) is an electric motor. 4. Transfer machine according to claim 1, characterized in that the positioning devices at least two planar and spaced apart on the underside of the pallet horizontally extending stop surfaces (81,83), which are on a parallel to the Track (2) are located and in the area of the respective work stations (3) facing front (10) of the pallet (7) are provided, and that the stop surfaces (81, 83) with corresponding stop surfaces located in the area of the respective work station (3) (85.86) cooperate in the sense of an exact height fixation of the pallet (7). 5. Transfer machine according to claim 1, characterized in that that the positioning devices are arranged at least two on the underside of the pallet (7) in the area of the front side (10) Contain stop surfaces (91,92) which are inclined relative to the vertical, such that their lower edge is closer to The middle of the pallet (7) is its upper edge copy. and in which the projection of the surface normals onto a horizontal plane is essentially parallel or runs at a small angle to the feed direction and that the inclined abutment surfaces (91, 92) with corresponding complementary inclined surfaces (93, 94) in the area of the respective work stations (3) cooperate in the sense of an exact fixation in the feed direction. 6. Transfer machine according to claim 1, characterized in that that the positioning device for fixing the pallet (7) in the longitudinal direction of the Track (2) one with a corresponding recess (117, 118) cooperating in a longitudinally displaceable manner has mounted index bolt (95), either the index bolt (95) or the Recess (117, 118) provided on the pallet (7) is. 7. Transfer machine according to claim 6, characterized in that that the index bolt (95) is positively driven and displaceable. 8. Transfer machine according to claim 7, characterized in that that the index bolt (95) of. a bilateral fluid drive (103) via a wedge gear (97,98) acting in two directions is longitudinally displaceable, one of which is the index bolt (95) penetrating, in cross-section rectangular opening (97), which is oblique to the longitudinal axis of the Index bolt (95) runs, as well as a through the opening (97), from the fluid drive (103) driven slide (98) of the same cross-section COPY 3332B70 as the opening (97) contains, the inclination of which is the slope of the opening (97) with respect to the Longitudinal axis of the index bolt (95) corresponds to and perpendicular to the longitudinal axis of the index bolt (95) is performed. 9. Transfer machine according to claim 6, characterized in that that the index bolt (95) is cylindrical and on its with the recess (117,118) cooperating end has two flat bevel surfaces (114, 115) adjoining one another, their common cutting edge (116) in the direction of the adjacent end face of the index bolt (95) runs on its longitudinal axis, and that the recess cooperating with the index bolt (95) complementary bevel surfaces (117,118) wearing. 10. Transfer machine according to claim 9, characterized in that that the index bolt (9 5) over its entire length on the cutting edge (116) of the two bevel surfaces (114, 115) opposite Side (120) is flattened. ' 11. Transfer machine according to claim 1, characterized in that that the pallet (7) contains the drive device with at least one of the Rolls (8,9,11,12) is coupled in a rotationally fixed manner, which are rotatably mounted in the pallet (7) and with which the pallet (7) runs along the track on rails (5,6), and that the pallet (7) by the drive device in the sense of separating the positioning device (81,82,83, 84,85,86,87,88; 91,92,93,94) can be lifted or moved. 12. Transfer machine according to claim 11, characterized in that that the rollers (8,9,11,12) are fixed in the respective work station (3) Pallet (7) are out of engagement with the associated rails (5,6). 13. Transfer machine according to claim 11, characterized in that that the pallet (7) contains a total of 'four roles (8,9,11,12), each of which two are coaxial 'arranged and rotatably connected to one another, the rollers (8,9,11,12) on a total of two parallel rails (5, 6) running next to one another along the track (2) to run. 14. Transfer machine according to claim 11, characterized in that that the pallet (7) contains a total of two rollers (9, 12) arranged in the area of the front side (10), which are circular on a running rail (5) run along, and that the pallet (7) in the area of its rear The end is held in a stationary central warehouse (150) having three degrees of freedom, which is arranged concentrically to the circular rail (5). 15. Transfer machine according to claim 11, characterized in that that the roles (8,9,11,12) have the shape of a double! truncated cone and from two identical, axially mutually movable frustoconical, non-rotatably connected to one another Disks (24,25,43,44) consist of - 6- one of which (25, 44) is fixedly mounted in the pallet and the other (24, 43) is axially displaceable is, depending on the position of the conical disks (24,25,43,44) of the rollers (8,9, 11, 12) the positioning devices (81-84, 85-88; 91-94) in engagement with one another and the rollers (8,9,11,12) from the treads (22,23) of the rails (5,6) are free or vice versa. 16. Transfer machine according to claim 15, characterized in that that the two conical disks (24, 25,43,44) of each roller (8,9,11,12) with their each smaller face to face each other, the rear end of the Pallet (7) facing conical disk (25, 44) is fixedly mounted, and that the rail or rails (5,6) on which the rollers (8, 9,11,12) run along, a gable roof-shaped Have cross-section, such that when the two move towards each other Conical pulleys (24,25,43,44) of each roller. (8,9, 11,12) the pallet (7) angled upwards Directed movement in the sense of separating the stop surfaces (81 - 84, 85 - 88; 91 94) executes. 17. Transfer machine according to claim 16, characterized in that that the fixedly mounted conical disk (25, 44) is axially in a corresponding bearing bore (28, 46) of the pallet (7) secured hub (26,48) carries the one Through opening (35,49) with internal teeth. (36) contains and through which a complementary external toothing (38) carrying, longitudinally displaceable Push rod (37) leads through, on which the other conical disk belonging to the respective roller (8,9,11,12) is axially secured (24,43) sits non-rotatably with a corresponding internal toothing, and that the push rod (37) is coupled to a linear drive (76) via a vortex bearing (63,65,66). 18. Transfer machine according to claims 6 and 13 or 6 and 14, characterized in that the index bolt (95) is longitudinally displaceable in the vertical direction is guided in a bore (96) of the pallet (7) and its bevel surfaces (114,115) in the direction of the front (10) of the pallet (7). 19. Transfer machine according to claim 14, characterized in that that the pallet (7) in the central warehouse (150) is rotatable about the vertical axis a horizontal axis is pivotable and can be displaced to a limited extent relative to the vertical axis. 20.Transfer machine according to claims 6 and 11, characterized in that the positioning device a total of four support surfaces (81-84) provided on the pallet (7) and has two inclined surfaces (91,92) arranged on the pallet (7), and that the Index bolt (95) in the area of the front (10) midway between the two on the front (10) adjacent bearing surfaces (81st, 82) is located. 21. Transfer machine according to claim 20, characterized in that that the two inclined surfaces (91 and 92) and the bearing surfaces (81 and 83), which are in the Area of the front (10) of the pallet (7), the same distance from the or the rails (5,6). 22. Transfer machine according to claim 11, characterized in that that the pallet (7) has a total of two rollers mounted in the area of its front side (10) (200) contains on a circular, desk-shaped cross-section rail (5) of the Run along track (2), and that the pallet (7) in the region of its rear end in a two Fixed central bearing (150) having degrees of freedom is supported, which is concentric to the circular extending rail (5) is arranged. 23. Transfer machine according to claim 22, characterized in that that the two rollers (200) each have the shape of a truncated cone and in the Pallet (7) are rotatably and axially displaceably mounted in such a way that when the rollers (200) are advanced the stop surfaces (81, 83 and 93, 94) of the positioning device are disengaged and when the rollers (200) are pushed back from the Rail (5) are free. 24. Transfer machine according to claim 23, characterized characterized in that the rollers (200) are coupled to a shaft (201) in a rotationally fixed and axially secured manner are connected to a linear drive via a vortex bearing and can be rotated by a drive motor (21) is. 25. Transfer machine according to claims 6 and 22, characterized in that the index bolt (95) in the pallet (7) radially points to the axis of rotation of the central warehouse (150) too longitudinally displaceable is mounted and its bevel surfaces (114, 115) point upwards. 26. Transfer machine according to one of the preceding Claims, characterized in that the flank angle of the rollers (8,9,11,12,200) the angle of the running surfaces (22,23) of the rails (5,6) is adapted. 10 -