EP0138122B1 - Device for accumulating and changing of tools at the revolving implement of a revolving press - Google Patents

Description

The invention relates to a device for storing and changing tools of the tool turret of a turret punch according to the preamble of claim 1. Such a device is state of the art.

As is known, turret punches are already equipped with a tool reservoir in turret adjusters due to the arrangement of their individual tool sets, each of which consists of at least one punch, a scraper and a die, whereby one tool set is removed from the respective work station and another into the latter by simply rotating the turret adjuster can be introduced. The processing of plate-shaped workpieces with complicated geometric shapes, however, often requires a variety of tools which exceeds the capacity of such turret plates, so that there is a need to enlarge the tool reservoir available for a turret punch. It is known for this purpose to manually install and remove the tool sets of the turret plates, which, however, is associated with more or less extensive manual work, depending on the type and attachment of the tools, and thus results in lost time for the operation of the machine. To simplify the tool change, tool holders, which are fastened to the turret plates, have already been developed, which reduce the manual work to be carried out for the tool change. In this way, a certain reduction in loss times is achieved - automated operation, i.e. however, a tool change that is independent of manual intervention is not possible in this way.

From DE-A1-25 26 765 a punching machine with a tool magazine is known, which is designed as a system of two plates arranged one above the other, each containing complete sets of the upper and lower tools in the peripheral area. Complete tool sets can be removed from these plates via a tool changing device arranged within the peripheral area enclosed by the plates and fed to the punching machine designed as a single-head machine. The disadvantage of this known punching machine is that the tool reservoir available must be limited in accordance with the size of the plates, taking into account the required space requirement.

From DE-A1-27 10 314 a milling machine with a tool changing device is known, which is arranged between a plate-like magazine equipped on the circumferential side with the tool and the work station, namely the drive spindle of the milling machine. The milling tool is accommodated in special tool holders, which are always handled uniformly with the tool. The vertically movable tool changing device consists of two pair of gripper tongs, which can be swiveled around a vertical axis by a motor, radially retractable and extendable with respect to this axis, arranged in a horizontal plane at a fixed angle, the gripping members of which are hydraulically actuated and designed to grasp the tool holder. A disadvantage of this known machine tool is that the tool reservoir is limited with regard to the required footprint.

Finally, from DE-A1-32 30 051 another machine tool, namely a vertical lathe with a tool changing device is known, which interacts with an annular plate-like tool magazine, in the circumferential area of which the individual tools are held. The tools are held by means of tool holders in recesses which are open radially outwards in the peripheral region of the tool magazine, with the participation of fork-like tool holder supports, by means of which the respective tool holders are gripped on both sides. The tool can be coupled on the top side in the workstation to a drive element of the machine tool, the tool being able to be removed from the tool magazine downwards by radially withdrawing the fork-like tool holder supports. In order to remove the tool from the tool magazine or to insert tools into the tool magazine, corresponding vertical movements of the drive element mentioned are therefore necessary. Similar disadvantages apply here as in the two exemplary embodiments already described above.

It is the object of the invention to develop a device for storing and changing tools of the tool turret of a turret punch, which considerably expands the capacity of the tool held for mechanical machining of plate-like workpieces in the turret adjusters and is characterized in particular by a simple and space-saving construction. This object is achieved by the features of the characterizing part of claim 1.

According to the invention, the turret punch is thus assigned a transfer device and a memory which provides the tool intended for use in the turret adjusters in individual cassettes held in cassette magazines, so that the size of the tool reservoir available for processing by means of the turret punch corresponds to the capacity of the Cassette magazines and their number is increased. The cassette magazine is displaceably fastened in the transfer device in such a way that the tool held ready in the individual cassettes can be fed to the turret discs or that the tool used in the turret discs can be taken over by these cassettes. It is therefore essential that only the tools are inserted into the turret plate, while the cassettes as such can be displaced relative to the cassette magazines, in the direction of the turret plate or away from it, but as such are not inserted into the turret plate will. The cassettes therefore only serve the purpose of detection elements for the tools to be replaced, so that redesigning work in the area of the turret plate is kept to a minimum. The shape of the cassette magazine is arbitrary per se, but it is preferably column-shaped, the individual cassettes being held one above the other and the cassette magazine being mounted in the transfer device or the store in its longitudinal direction. Such a columnar shape of the cassette magazine means that the available space of the turret punch is optimally used. It is also essential that the cassette magazine can be locked in the transfer device in defined positions which serve the actual tool changing process. The capacity of such a cassette magazine is practically only limited by its manageability, it being assumed that the cassette magazines can be inserted into the memory manually. However, it is also conceivable to use lifting devices for inserting the cassette magazines, so that larger units are also possible. The fact that the cassette magazines in the transfer device are vertically adjustable in batches and can be taken over from the memory means that cassette magazines can be transferred from the memory device to the transfer device and vice versa without any manual intervention. A tool or tool set located at any point of any cassette magazine can thus be inserted fully automatically into the turret plate at any time by transferring the cassette magazine containing this tool from the memory to the transfer device. To integrate a turret punch equipped in this way into a computer-controlled production facility, only a corresponding location coding of the individual locations in the cassette magazines is required in order to be able to define the necessary control commands, for example an NC or CNC control. The fact that both the storage device and the transfer device are kept movable in a common vertical plane on lateral rails attached to the punch not only enables any tool change, but also simplifies the structural measures required for manual interventions free transfer of cassettes from the memory to the transfer device and vice versa are required. The transfer device is held so that it can be moved independently of the memory, so that complete magazine cartridges can be replaced in the memory while the turret punch, in which the transfer device is integrated, is in operation. In this way too, a significant contribution to an improved time utilization of a turret punch is made. Characterized in that the rails carrying the memory and the transfer device are attached to the turret punch, practically no stand space is required for the device according to the invention and a very compact design is made possible. A memory is used in which the columnar cassette magazines mentioned are inserted next to one another and extend vertically. The removal pins and coupling pins according to the invention, which are attached to the cassettes, also contribute to the simple construction of the device. While the removal pins only have a support function perpendicular to their longitudinal axis, a locking function can also be performed on the tool to be held in the direction of their longitudinal axis via the coupling pins. The adaptation work to be carried out on the tools of the turret punch in this way to the device according to the invention is therefore essentially restricted to the provision of corresponding bores into which the removal pins or the coupling pins are inserted for carrying out the tool changing process and to the constructive realization of a corresponding displacement of the Tools that allow tools to be moved in the direction of the displaceability of the cassettes. The latter direction of displacement corresponds to the direction of displacement of the loading head, which according to the invention can be coupled to a cassette.

The features of claim 2 describe a design variant of the memory, in which the columnar cassette magazines are located along the peripheral region of a drum which is rotatably mounted about its axis. The drum can, for example, be mounted vertically relative to the transfer device in such a way that the cassette magazines also here can be transferred or transferred from the transfer device by vertical displacement.

The features of claim 4 represent a structurally easy to implement displaceability of the cassette magazines.

The features of claim 5 have the advantage that the cassette magazines can be fixed both in the transfer device and in the memory in precisely defined positions, which simplifies the transfer or acceptance of the cassette magazines.

The features of claim 7 have the advantage that, for example, the insertion of a cassette magazine into the memory takes place when the clutch is disengaged, so that it is not engaged, so that the rack of the cassette magazine can be brought into engagement with corresponding counter-elements, for example gear wheels, due to the not engaged clutch these gears are freely rotatable. In principle, there is the possibility of providing such a switchable coupling also in the drive elements assigned to the transfer device. The latter is particularly important if the transfer device is used without the memory according to the invention.

The arrangement and design of the coupling pin according to claims 8 and 9 represents a very simple constructive solution to the problem of locking the tool to be handled horizontally in each case. To carry out this locking, the coupling pins only have to be rotated so that the locking groove is brought into engagement with a corresponding counter element in the bore provided on the tool in question.

The corresponding drive elements of the coupling pins are simplified by the features of claim 10. Starting from a single rotary drive, all coupling pins can thus be driven, for example, by means of a rack.

The design of the displaceability of the loading head according to claims 11 to 13 makes it possible that not only the coupling pins can be coupled to a rotary unit by means of a single functional element, namely this loading head, but also the cassette in the direction of the turret plate of the turret punch or in Direction of these can be moved. This summary of functions brings with it a very compact design.

Due to the features of claim 16, a support function is exercised on the cassette during its movement towards the turret plate of the turret punch. The cassette is therefore subject to precisely defined guidance in every working phase.

The parallel keys according to claim 20 can supplement the function of the guide bolts, but can also replace them.

The features of claim 23 have the advantage that no movable coupling element is required to detect a cassette on the loading head. Rather, the latter is already detected by moving the cassette magazine in its longitudinal direction, which ensures the corresponding engagement between the driving claw and the driving piece.

• Fig. 1 eine Seitenansicht einer Revolverstanze mit einer erfindungsgemäßen Vorrichtung.
• Fig. 2 eine Ansicht der Fig. 1 gemäß Pfeil II.
• Fig. 3 eine Draufsicht der Fig. 1 gemäß Pfeil 111.
• Fig. 4 eine Schnittdarstellung in einer Ebene IV-IV der Fig. 1;
• Fig. 5 eine vergrößerte Darstellung der Überführungseinrichtung ohne eingesetztes Kassettenmagazin;
• Fig. 6 eine Draufsicht der Fig. 5 gemäß Pfeil VI;
• Flg. 7 eine Schnittdarstellung in einer Ebene VII-VII der Fig. 5;
• Fig. 8 eine Schnittdarstellung in einer Ebene VIII-VIII der Fig. 7;
• Fig. 9 eine Schnlttdarstellung in einer Ebene IX-IX der Fig. 7;
• Fig. 10 eine vergrößerte Draufsicht auf den Speicher gemäß Pfeilrichtung X der Fig. 1;
• Fig. 11 eine vergrößerte Darstellung des Speichers gemäß Pfeilrichtung XI in Fig. 2;
• Fig. 12 eine vergrößerte Darstellung der Einzelheit XII der Fig. 11;
• Fig. 13 eine Schnittdarstellung in einer Ebene XIII-XIII in Fig. 6;
• Fig. 14 eine Schnittdarstellung in einer Ebene XIV-XIV der Fig. 13;
• Fig. 15 eine Schnittdarstellung in einer Ebene XV-XV der Fig. 13;
• Fig. 16 eine Schnittdarstellung in einer Ebene XVI-XVI der Fig. 13.

Further advantages and features of the invention result from the embodiment shown in the drawings. Show it:

• Fig. 1 is a side view of a turret punch with a device according to the invention.
• 2 is a view of FIG. 1 according to arrow II.
• 3 is a plan view of FIG. 1 according to arrow 111.
• Fig. 4 is a sectional view in a plane IV-IV of Fig. 1;
• 5 shows an enlarged illustration of the transfer device without a cassette magazine inserted;
• 6 shows a top view of FIG. 5 according to arrow VI;
• Flg. 7 shows a sectional illustration in a plane VII-VII of FIG. 5;
• Fig. 8 is a sectional view in a plane VIII-VIII of Fig. 7;
• Fig. 9 is a sectional view in a plane IX-IX of Fig. 7;
• FIG. 10 is an enlarged top view of the memory in the direction of arrow X in FIG. 1;
• FIG. 11 shows an enlarged representation of the memory according to arrow direction XI in FIG. 2;
• Fig. 12 is an enlarged view of the detail XII of Fig. 11;
• 13 shows a sectional illustration in a plane XIII-XIII in FIG. 6;
• Fig. 14 is a sectional view in a plane XIV-XIV of Fig. 13;
• Fig. 15 is a sectional view in a plane XV-XV of Fig. 13;
• 16 is a sectional view in a plane XVI-XVI of FIG. 13.

1 to 4 denotes a turret punch, the machine frame 2 of which carries two turret disks 3 and 4 which are arranged at a distance from one another and are rotatably mounted about a vertical axis. The turret plates 3, 4 carry a series of tool sets along their circumference, thus in a circular arrangement, each of which consists of at least one stamp, one stripper and one die. The reference numerals 5, 6 in FIG. 2 each designate a stamp holder and a scraper shoe.

The machine frame 2 laterally, horizontally extending, carries a rail 13 on which a transfer device 8 is slidably mounted. The transfer device 8 is displaced by means of a ball screw 14, which is connected to a motor 15 via a coupling 16. The motor can be designed, for example, as a DC motor. For driving the transfer device along the rail 13 However, other systems can also be provided, for example a piston-cylinder unit which can be acted upon pneumatically on both sides.

The transfer device 8, the construction of which will be explained below, is designed to accommodate a cassette magazine 9, which serves as a carrier for a number of tool sets which are designed for use in the turret adjusters 3 and 4. The cassette magazine thus has the function of a tool reservoir and will also be explained in more detail below.

In FIG. 1, the transfer device 8 is shown in dash-dot lines in its rest position 88 and is drawn out in its working position 89.

The machine frame 2 also carries above the rail 13 two further mutually arranged, also horizontally extending rails 19, which serve for the displaceable fastening of a memory 10. The displacement of the memory 10 along the rails 19 takes place by means of a ball screw 20 which is operatively connected to a motor 21.

The memory 10, the construction of which will be explained in more detail below, serves to hold a plurality of cassette magazines 9, three of which are shown in FIG. 1, and in this way contributes to an enlargement of the tool reservoir. The individual cassette magazines 9 can be transferred from the transfer device 8 into the memory 10 or from the memory into the transfer device 8 individually without manual intervention.

As can already be seen from the above, the tool storage capacity of the turret punch according to the invention is thus determined both by the capacity of the cassette magazines 9 used and by the number that can be accommodated in the memory 10.

In the following drawings, functional elements that correspond to those of FIGS. 1 to 4 are designated accordingly, so that a repeated description in this regard is unnecessary. 5 and 6 show the transfer device 8 according to the invention both in a side view and in a plan view. The transfer device 8 then consists of a carriage 90 which is guided in a sliding manner along the rail 13, a cantilever 91 being arranged on this carriage, extending and angled away from the turret punch, to the end region of which a guide frame 53 is fastened. The guide frame 53 is U-shaped and open in the direction of the turret punch 1. It serves to hold and vertically guide a cassette magazine 9, which is inserted vertically according to the drawing in FIG. 6. The boom 91 also carries a motor 17, the drive pinion 92 is in engagement with a rack 18, by means of which the cassette magazine 9 can be moved vertically. Designated at 52 is a piston-cylinder unit, by means of which the cassette magazine 9 can be locked in certain positions, which serve the actual tool changing process. Their exact arrangement will be described in the following.

7 and 8, the transfer device 8 according to the invention is provided with a loading head 70 which is slidably mounted along guide rods 60 which are fastened to the boom 91 and extend in the direction of the turret punch 1. A piston-cylinder unit 59 is used for motorized displacement of the loading head 70, the cylinder of which is supported on the arm 91 and the piston rod 93 of which is connected to the loading head. The piston-cylinder unit 59 can be acted upon pneumatically on both sides.

A rotary assembly 58 is fastened on the loading head 70, for example an electric motor, the output shaft 94 of which cooperates with a rack 57 in a manner to be described. The rack 57 is in turn in engagement with three gear wheels 56, which are mounted one below the other in the loading head 70, one of which can be seen in FIG. 8. Each of these gears 56 is supported on a shaft 54 which is on its other, i.e. the end facing away from the gear 56 ends in a coupling jaw 55.

The loading head 70 is equipped with a driving claw 65 which engages with a correspondingly designed driving piece 64 of a cassette 61 which enables a positive connection. The cassette 61 serves, as will be explained below, for the mechanical handling of a tool set, a plurality of such cassettes being inserted one above the other into a cassette magazine 9.

The basic body of the cassette 61, which is essentially U-shaped, except for the centrally arranged driving piece 64, is supported between the two, vertically extending guide rails 49, 49 'of the cassette magazine 9 in the vertical direction by feather keys 62 on both sides which are laterally attached to the cassette 61 and are in engagement with corresponding grooves machined into the guide rails 49, 49 '.

The cassette 61 overlaps the guide rails 49, 49 'laterally on both sides, so that the overlap surfaces 95, 95' simultaneously form a stop.

The guide rails 49, 49 'are bridged at certain uniform intervals by connecting webs 68 which are fastened to the guide rails in a manner which is not shown here in any way. Here, the vertical distance between two connecting webs essentially corresponds to the vertical dimensions of a cassette 61.

Guide bolts 66 are inserted, for example screwed, into the connecting webs 68, which extend horizontally in the direction of the turret punch 1 and serve to guide the cassette 61. For this purpose, the lower boundary edge 96 of the cassette 61 facing the turret punch is equipped with two approximately semicircular recesses 97 which rest on the guide bolts 66.

The vertical extent of the driving claw 65 of the loading head 70 which is open at the top and bottom and in which the driving piece 64 of the cassette 61 is held in a form-fitting manner can be seen from FIG. 7. The carrier piece 64 can be pushed out of the carrier claw 65 by vertical displacement of the cassette magazine 9 with respect to the loading head 70. The cassette 61 is secured against unintentional pulling out in the direction of the arrow 37 (FIG. 8) by a spring-loaded ball locking pin 63, which is held in a bore in the guide rail 49 'and can be brought into engagement with a corresponding recess in the cassette 61. Such a ball locking pin 63 is assigned to each receiving field of the cassette magazine 9, which is defined by two connecting webs 68 arranged one above the other, so that all the cassettes located in the cassette magazine 9 are secured in this way.

The guide rail 49 'of the cassette magazine 9 is firmly connected on its outside to a vertically extending toothed rack 18, which in turn is in engagement with a gearwheel, not shown, on the output shaft of a motor 17 (FIG. 1). So that a precise position of the cassette 61 is ensured for the tool change, there is a locking bush 50 in the guide rail 49, into which a locking bolt 51 can be inserted, which directly connects to the piston rod of the piston-cylinder unit 52 (FIG. 5) stands. The cylinder of the piston-cylinder unit 52, which can be acted upon pneumatically on both sides, is attached directly to the guide frame 53. When the locking bolt 51 is inserted into the locking bush 50, both a precisely defined height position of the cassette magazine 9 and its locking in this position are thus ensured. The side of the cassette 61 facing the turret punch 1 is equipped with three superimposed removal pins 45 and coupling pins 46, which are each arranged in pairs next to one another, the removal pins 45 being rigid, while the coupling pins 46 are rotatably arranged in the cassette 61. The coupling pin 46 has two bearing points 69 in a bearing block 99 of the cassette 61, a locking pin 85 being arranged in a bore of the bearing block 99 between the bearing points, which can be brought into engagement with the locking notches 84 associated therewith, so that the coupling pin 46 in certain Angular positions can be locked by means of these notches.

On its end facing the turret punch 1, the coupling pin 46 has a section 100 of circular cross-section, the round section of which is provided with a locking groove 47. At its other end facing away from section 100, the coupling pin 46 ends in a square pin 48.

Each of the three coupling pins 46 arranged one below the other can be engaged via its square pin 48 by displacement of the loading head 70 with a coupling jaw 55 of the shafts 54, so that by means of the rack 57, which is vertically displaceable relative to the loading head 70, all three shafts 54 and so that the associated coupling pin can be rotated. As will be explained in the following, the vertical distance between the individual pairs of removal pins 45 and coupling pins 46 and the lateral distance of the removal pins 45 from the coupling pins 46 each depend on the turret punch 1 to be supplied with tool sets.

The transfer device according to the invention is thus characterized in that a carriage 90 is mounted such that it can be moved by a motor on a rail 13 which is fixedly arranged on the turret punch 1 and which carries a guide frame 53 which in turn serves as a vertical guide element for a cassette magazine 9, from which a loading head 70 is used individual cartridges 61, which are to be described with tool sets, can be displaced horizontally in the direction of a turret punch 1. The loading head 70, in conjunction with the piston-cylinder unit 59 assigned to it, forms a thrust drive for displacing the tools held in the cassette 61 in the direction of the turret punch 1 or away from it.

9 shows the gear wheels 56 arranged one below the other as well as their drive linkage with the rack 57, the rack 57 in turn being driven via the transmission pinion 67, which is arranged directly on the output shaft of the rotary assembly 58. The approximately square shape of the cassette 61 and the loading head 70 and the position of the guide rods 60 assigned to the latter can also be seen.

The structural design of the memory 10 according to the invention can be seen from FIGS. 10 and 11. This consists in particular of two jibs 22 arranged next to one another, each of which is formed in pairs and is each held on the rails 19 arranged one above the other by slide bushes 23. A middle boom 24 is used to drive the horizontal Memory 10 along the rails 19 by means of the ball screw 20 and the motor 21 (Fig. 1).

At their end facing away from the rails 19, the arms 22, 24 are connected to a guide frame 71, which is characterized by three, essentially U-shaped guide profiles 25. These vertically extending guide profiles 25 are designed in such a way that a cassette magazine 9 can be inserted into them, from above, which is then secured by the shape of these guide profiles 25 in the horizontal plane. In the drawing of FIG. 10, only a cassette magazine 9 is indicated schematically, while the other two guide profiles 25 are empty. The guide frame 71 is otherwise equipped with three horizontally extending mounting plates 26, each of which is assigned to a guide profile 25. A brake motor 73 is fastened on each of these mounting plates 26, the output shaft of which can be coupled via a switchable coupling 75 to a gear 74 which projects into the guide profile 25 d of the guide frame 71 via a lateral recess 27. The gear 74 is located on a shaft 28 which is mounted on the bearings 80, 80 '.

The gear 74 is in engagement with the rack 18, which is fastened to the guide rail 49 'of the cassette magazine 9. When the clutch 75 is not engaged, i. when the gear 74 is freely rotatable, the cassette magazine 9 can thus be inserted from above and the rack 18 can be brought into engagement with the gear 74.

The vertical extent of the memory 10, in particular of the guide frame 71, can be seen in detail in FIG. 11.

For the vertical locking of the cassette magazine 9, each guide frame 71 or each guide profile 25 is equipped with a special locking device 76, which is arranged in the lower region of the guide frame 71. The locking device 76 is explained in more detail below with particular reference to the drawing of FIG. 12. According to this, the locking device 76 consists of a piston-cylinder unit 77, the cylinder of which is fastened to the guide frame 71, the piston rod 78 of which is directly connected to a slide 79 which is guided in an opening 82 in the guide frame 71 in such a way that it is one Connecting web 68 of the cassette magazine 9 engages. The piston-cylinder unit 77 can be acted upon pneumatically on both sides, so that the slide 79 can be pushed under a connecting web 68, but can also be pulled into the opening 82 so far that a vertical movement of the cassette magazine 9 is not hindered.

13 to 16 show the equipping of the removal pins 45 and coupling pins 46 of a cassette 61 with a set of tools, consisting of a punch 29, a stripper 30 and a die shoe upper part 7, which carries a die 31. It is assumed here that the punch and die of the turret punch to be equipped with it can be removed or inserted radially from the turret adjusters 3, 4, the stripper being inserted into a stripper shoe and being secured, for example, by means of pawls known per se, and the die shoe upper being in a bracket attached to the top of the lower turret plate is also radially insertable and can be positively fixed. It is only essential that the punch 29, the stripper 30 and the upper part 7 of the die shoe are each equipped with bores 32, 33 running parallel to one another, perpendicular to the axis of the bores 33 at a defined distance from the outer boundary surfaces 34 of the punch 29 , the scraper 30 and the upper part 7 of the die shoe are bores 35 which penetrate these in the edge region of the bores 33 and are of substantially smaller diameter than the bores 33. The bores 35 serve to receive pins 86, which in this way partially protrude into the bores 33. The diameter of the pins 86 and the bores 35 are adapted to the locking grooves 47, so that a pin 86 can be completely enclosed by the cross-sectional profile of a locking groove 47 in connection with the bore 35.

While the non-rotatably mounted removal pins 45 essentially only take on a vertical support function after they have been introduced into the bores 32, the rotatably mounted coupling pins 46 also have a horizontal securing function in addition to a vertical support function, namely to the extent that the pins 86 in conjunction with the Locking grooves 47 an unintentional removal of the punch 29, the scraper 30 or the upper part 7 of the female shoe from the removal pins 45 and coupling pin 46 is prevented. When the coupling pins 46 are introduced into the bores 33 assigned to them, the coupling pins 46 are in a rotational position, in which the section 100 provided with a flattened portion is on the side facing away from the pins 86, in relation to the drawing of FIGS. 14, 15 and 16 is rotated by 180 °. In this rotational position, the insertion of the coupling pin 46 into the bores 33 is not hindered by the pins 86. Then the locking groove 47 is brought into positive engagement with the pin 86 by rotating the coupling pin 46 by 180 °, so that the securing is given in the above sense.

In this way, all the cassettes 61 of the cassette magazines 9 can be loaded, in particular the capacity of the memory 10 can be expanded in a simple manner, so that a large tool reservoir is available which can be called up under program control and the tool change of the turret punch can be carried out practically fully automatically under computer control.

• Zum Auswechseln eines in den Revolvertellern 3, 4 der Revolverstanze 1 gehaltenen Werkzeugsatzes, bestehend aus Stempel 29, Abstreifer 30 und Matrize 31 wird zunächst die Überführungseinrichtung 8 aus ihrer Ruheposition 88 durch Einschaltung des Motors 15 entlang der Schiene 13 in ihre Arbeitsposition 89 verfahren. Es wird hier davon ausgegangen, daß sich in dem Führungsrahmen 53 der Überführungseinrichtung 8 ein Kassettenmagazin 9 befindet, dessen sämtliche Aufnahmefelder mit Kassetten 61 bestückt sind, von denen eine Kassette 61 den geeigneten Werkzeugsatz enthält, wohingegen die Entnahmestifte 45 und die Kupplungszapfen 46 einer Kassette 61 dieses Kassettenmagazins 9 keinen Werkzeugsatz tragen. Es wird somit zunächst durch Einschaltung des Motors 17 in der entsprechenden Drehrichtung sowie Druckbeaufschlagung der Kolben-Zylinder-Einheit 52, wodurch der Arretierbolzen 51 in Richtung des Pfeiles 36 aus der Arretierbuchse 50 herausgezogen wird, das Kassettenmagazin 9 vertikal verfahren, um die leere Kassette 61 relativ zu den Revolvertellern 3,4 in eine Position zu bringen, welche den Werkzeugwechsel ermöglicht. In dieser Position wird zunächst durch Anhalten des Motors 17 sowie Druckbeaufschlagung der Kolben-Zylinder-Einheit 52 der Arretierbolzen 51 in die Arretierbuchse 50 entgegen der Richtung des Pfeiles 36 eingefahren, so daß die genannte leere Kassette 61 in dieser Position fixiert ist.

The mode of operation of the device according to the invention for changing and storing tools of the tool turret of a turret punch will be briefly explained below:

• To replace a tool set held in the turret adjusters 3, 4 of the turret punch 1, consisting of punch 29, stripper 30 and die 31, the transfer device 8 is first moved from its rest position 88 by switching on the motor 15 along the rail 13 into its working position 89. It is assumed here that a cassette magazine 9 is located in the guide frame 53 of the transfer device 8, all of the receiving fields of which are equipped with cassettes 61, of which a cassette 61 contains the suitable tool set, whereas the removal pins 45 and the coupling pins 46 of a cassette 61 this cassette magazine 9 do not carry a tool set. Thus, by switching on the motor 17 in the corresponding direction of rotation and pressurizing the piston-cylinder unit 52, whereby the locking bolt 51 is pulled out of the locking bush 50 in the direction of arrow 36, the cassette magazine 9 is moved vertically around the empty cassette 61 to be brought into a position relative to the turret adjusters 3, 4 which enables the tool change. In this position, the locking bolt 51 is first inserted into the locking bush 50 against the direction of the arrow 36 by stopping the motor 17 and pressurizing the piston-cylinder unit 52, so that the empty cassette 61 mentioned is fixed in this position.

There is now a pressurization of the piston-cylinder unit 59, whereby the loading head 70 along the guide rods 60 in the direction of arrow 37, i.e. to move to the turret punch. As a result, the coupling jaw 55 of each of the three shafts 54 (FIG. 9) is brought into engagement with the corresponding three square pins 48 of the coupling pins 46. At the same time, the pressure surface 38 of the driving piece 64 bears against the guide surface 39 of the loading head 70, so that in the following the cassette 61 along the parallel keys 62 and the guide bolts 66 likewise in the direction of the arrow 37, i.e. is moved towards the turret punch. The cassette 61 is moved in this direction until the removal pins 45 and the coupling pins 46 are inserted into the corresponding bores 32, 33 of the die 29 to be replaced, the stripper 30 and the upper part 7 of the die shoe with the respective die 31. During this insertion phase, the coupling pins 46 are in an angular position in which the flattening of the section 100 is in each case on the side facing the pins 86, so that a problem-free insertion is possible. In a next step, by actuating the rotating assembly 58 via the rack 57, the gears 56, the shafts 54, the coupling pins 46 are rotated through 180 °, so that their locking grooves 47 are positively engaged with the pins 86. It should be mentioned at this point that a replacement of the punch, the die and the stripper presupposes that, at the same time as the removal pins 45 and the coupling pins 46 are inserted, any locking elements which may be present, by means of which the punch, the die and the stripper in a horizontal plane secured, solved. However, this will not be discussed in more detail. Subsequently, the piston-cylinder unit 59 is acted on in the opposite direction, so that the loading head 70 moves along the guide rods 60 in the opposite direction to the arrow 37, thus moving away from the turret punch 1. Here, the pressure surfaces 40 of the driving piece 64 of the receiving unit 61 lie against the guide surfaces 41 of the loading head 70, so that the cassette 61 is subsequently also displaced in the opposite direction to the arrow 37. The displacement takes place until the cassette 61, as can be seen for example from FIG. 8, is inserted into the cassette magazine 9 and is secured here by means of the ball locking pin 63. Now, by actuating the motor 17 with the cooperation of the toothed rack 18 and after the locking bolt 51 has been withdrawn, the cassette magazine 9 is moved vertically in such a way that the cassette 61, which contains the tool set to be inserted into the turret plates 3, 4, faces the loading head 70. In this position, the cassette magazine 9 is locked in the manner already described by corresponding actuation of the piston-cylinder unit 52. By acting on the piston-cylinder unit 59, the cassette 61 is then moved in the manner already described in the direction of the turret plates 3, 4 and the tool set, i.e. the corresponding punch 29, the stripper 30 and the die shoe upper part 7 with the die 31 arranged thereon are inserted into the turret plates 3, 4. After rotation of the coupling pin 46 by means of the rotary assembly 58, the positive connection between the locking groove 47 and the pins 86 is released and the now empty cassette 61 is withdrawn into the cassette magazine 9 by appropriate actuation of the piston-cylinder unit 59.

In the event that a corresponding tool set in the held in the transfer device 8 Cassette magazine 9 is not present, but in one of the cassette magazines 9 present in the memory 10, this corresponding cassette magazine 9 must first be transferred from the memory 10 to the transfer device 8. For this purpose, the memory 10 is moved by actuating the motor 21 along the rails 19 into a position just above the transfer device 8. In this position, the guide profile 25 and the guide frame 53 are aligned. After this aligned position has been reached, the clutch 75, which can be configured, for example, as an electromagnetic tooth clutch, is switched on, as a result of which the cassette magazine 9 is locked due to the brake acting when the brake motor 73 is at a standstill . Then, by pressurizing the piston-cylinder unit 77 (FIG. 12), the slide 83 is retracted in the direction of the arrow 42 to such an extent that the connecting web 68 no longer grips under, the cassette magazine 9 is thus only held by the brake motor 73 . By now switching on the brake motor 73, the cassette magazine 9 is lowered within the guide profile 25 and simultaneously inserted into the guide frame 53 of the transfer device 8. The tool change of the tool set located in the turret adjusters of the turret punch 1 can then be carried out in the manner already described.

Loading the store 10 with new cassette magazines 9 can be carried out either manually or with the aid of a lifting device, depending on the mass to be transported. The locking of the individual tool sets by means of the removal pins 45 and the coupling pin 46 must be carried out manually. One of the cassettes held in a cassette magazine 9 is left empty for the replacement process, so that it is available for receiving a tool set to be replaced.

As can be seen from the foregoing, in the turret punch according to the invention, a tool change can thus be carried out fully automatically under computer control without any manual intervention being necessary. In this way, the turret punch is particularly suitable for numerical controls.

Claims (23)

1. Device for the storage and changing of tools of the tool turret of a revolving stamping press (1), with a store (10) in the upper part of the stamping press (1) for receiving a plurality of additional tool sets, said store (10) storing these tool sets with the tool axes arranged in the same direction as the turret axis and consequently as the axis of the stamping ram, and with a transfer device (8) for transferring the tool sets from the store (10) to the turret plate into which the tool sets are radially inwardly displaceable from the outside by a pusher of the transfer device (8), in such a manner that the tool sets maintain the orientation of their axes during the whole transfer,
characterised in that the tool sets are carried outside the turret in magazines as is known per se and the tool sets are held above one another in cassette magazines (9) which are vertically adjustable by steps in the transfer device (8) and in their highest position are taken possession of by a guide profile (25) of the store (10), the store comprising a plurality of neighbouring guide profiles (25) for the plurality of cassette magazines (9), wherein at least one guide profile (25) always remains empty, wherein the store (10) with all the cassette magazines (9) contained in it, as also the transfer device (8), are displaceable in a common vertical plane horizontally on rails (13, 19) connected at the sides of the stamping press (1), and wherein the pusher of the transfer device comprises a loading head (70) with which each cassette (61) is automatically coupled when the cassette magazine (9), in which it is held, is located at the correct height relative to the turret plates, wherein each cassette (61) comprises at least one coupling spigot (48) and an extraction pin (45) to hold the tool, which fit in lateral bores of the tool, wherein drive elements (56, 57, 58) are arranged on the loading head (70) to lock and unlock the coupling spigot (46) holding the tool to the cassette (61), and wherein the loading head (70) is displaceable by motor means in the direction towards the coupling spigot (46) and away from it and is provided with an entraining claw (65) which can be brought into engagement with a corresponding entraining member (64) of a cassette (61).

2. Device according to claim 1, characterised in that the store (10) is shaped as a drum mounted to be rotatable in a horizontal plane, the peripheral zone of the drum being equipped to receive the cassette magazines (9).

3. Device according to one of claim 1 or 2, characterised in that the transfer device (8) and the store (10) are movably mounted relative to each other so that a transfer of cassette magazines (9) in the vertical direction is possible.

4. Device according to claim 3, characterised in that the cassette magazines (9) are fixedly connected to gear racks (18) and in that both the transfer device (8) and also the store (10) are equipped with drive elements which cooperate with the gear racks (18).

5. Device according to one of claims 1 to 4, characterised in that both the transfer device (8) and also the store (10) are equipped with devices for arresting the cassette magazines (9) in defined positions.

6. Device according to claim 5, characterised in that the devices for arresting the cassette magazines (9) are formed as piston-cylinder units (52, 77) which are preferably pneumatic double-acting units and which cooperate with arresting pins (51) or sliders (79), said arresting pins and sliders being mounted so that they can be brought into form-locking engagement with the cassette magazine (9).

7. Device according to one of the preceding claims 4 to 8, characterised in that the drive element arranged on the store (10) is a braking motor (73) associated preferably with each cassette magazine (9), said motor being couplable by means of a switchable coupling (75) with the gear rack (18) of the cassette magazine (9).

8. Device according to one of the preceding claims, characterised in that the coupling spigot (46) and the extraction pin (45) of a cassette (61) extend horizontally and spaced apart parallel to each other in a direction towards the stamping press (1), wherein the coupling spigot (46) is mounted to be rotatable about its longitudinal axis and is shaped for form-locking arresting of the tool carried on the extraction pin (45) and on the coupling spigot (46).

9. Device according to claim 8, characterised in that the end region of the coupling spigot (46) is shaped as a segment of a circle in cross section, wherein the round part of the cross section is provided with a locking groove (47) so that it is possible to arrest the tool in the direction of the longitudinal axis of the coupling spigot (46).

10. Device according to claim 8 or 9, characterised in that one cassette (61) has associated therewith a total of three extraction pins (45) and three coupling spigots (46) which are preferably arranged respectively vertically above one another.

11. Device according to one of the preceding claims 8 to 10, characterised in that the coupling spigot or spigots (46) can be coupled to a rotary installation (58) which is mounted on the loading head (70).

12. Device according to claim 11, characterised in that the loading head (70) is displaceable by means of a double-acting pneumatically energisable piston-cylinder unit (59), the cylinder of which is supported on a support arm (91) of the transfer device (8).

13. Device according to one of the preceding claims; characterised in that the cassette (61) is displaceable by means of the loading head (70) in the longitudinal direction of the extraction pin (45) and of the coupling spigot (46).

14. Device according to one of claims 11 to 13, characterised in that the rotary installation (58) arranged on the loading head (70) is in engagement by means of a gear rack (57), which is displaceably mounted relative to the loading head (70), with gear wheels (56) which are secured on respective shafts (54), with one end region of each said shaft being connectable to the coupling spigot or spigots (46).

15. Device according to one of claims 8 to 14, characterised in that the coupling spigot (46) is arrestable in fixed rotary angular positions.

18. Device according to one of the preceding claims, characterised in that the cassette magazine (9) is fitted with guide pins (66) which extend parallel to the longitudinal direction of the coupling spigots (46).

17. Device according to one of the preceding claims, characterised in that the cassette magazine (9) is composed of two guide rails (49, 49') extending in their longitudinal directions parallel to one another and spaced apart, said guide rails being bridged by connecting webs (68) which are arranged at definite distances from one another and which extend perpendicular to said guide rails.

18. Device according to one of claims 16 or 17, characterised in that the guide pins (66) are secured to the connecting webs (68) and extend perpendicular to the plane definable by the guide rails (49, 49').

19. Device according to one of claims 4 to 18, characterised in that the gear rack (18) is fixedly connected to one guide rail (49,49') and extends parallel to this said guide rail.

20. Device according to one of claims 11 to 19, characterised in that the cassettes (61) carry adjusting springs (62) which extend parallel to the direction of the displacement movement of the loading head (70) and which are in engagement with corresponding grooves in the guide rails (49,49').

21. Device according to one of the preceding claims, characterised in that separate devices, for example spring-loaded ball-latch pins (63), are provided for arresting the cassettes (61) in the cassette magazines (9).

22. Device according to one of the preceding claims, characterised in that the transfer device (8) and/or the store (10) are in engagement upon their lateral displacement with ball-roller spindles (14, 20) which for their part are connected to conventional drive means.

23. Device according to one of the preceding claims, characterised in that the entraining member (64) formed on the cassette (61) is engageable in the entraining claw (65) of the loading head (70) by displacement of the cassette magazine (9) in its longitudinal direction.

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