Die Ejector

Abstract

The invention relates to a die ejector (2) comprising a chamber (4) with a cover plate (40) having a channel and comprising a plurality of plates (56) arranged inside the chamber (4), the plates being respectively movable back and forth between a starting position (58) and a working position (60) and being designed to interact with a carrier to support the removal of the die from the carrier. The die ejector also comprises a drive element (100) in order to move the plate (56) to be moved out of the working position towards the starting position. The die ejector (2) further comprises: a magnet (20) or a spring system interacting with an anchoring area (74) of the plate (56) and exerting an attractive force (F') or a thrust force on the plate (54) directed towards the working position; and a stop element (78) in order to stop the movement of the plate (56) in the working position, wherein in the working position the plate abuts against the stop element (78).

Description

Technical Field

[0001] The present invention relates to a die ejector.

[0002] Such die ejectors are used in the assembly of semiconductor dies to support the separation and removal of semiconductor dies from a carrier. Background Art

[0003] Semiconductor dies (also known as chips in the industry) are typically placed on a carrier held by a frame. The carrier is preferably a film, also known as a tape in the industry, for processing on a semiconductor assembly device. The die adheres to the carrier. The frame with the carrier is received by a sliding wafer stage. The wafer stage is periodically displaced to provide one die after another at a predetermined position. The provided die is then picked up by a die gripper and placed on a substrate. The removal of the provided die from the carrier is supported by a die ejector (also known as a die ejector in the industry) located below the carrier.

[0004] A die ejector known from EP 2 184 765 A1 is a die ejector that includes a chamber that can be loaded with vacuum, has a cover plate with channels; a plurality of plates that are disposed in the chamber, extend into the channels, and can slide in a direction perpendicular or inclined to the surface of the cover plate; and drive means for displacing the plates. The drive means includes a drive mechanism that includes a motor and a pin that can move along a predetermined straight path. The pin can be moved back and forth between two positions by the motor, and these two positions determine the initial position or the working position of the plate. In its initial position, the plate moves back towards the interior of the chamber, and in its working position, the plate reaches its uppermost position towards the direction of the channel. Each plate has a strip-shaped opening, and the pin passes through the strip-shaped opening of each plate. The strip-shaped openings can vary with the plate, such that when the pin moves along the strip, the plates move to the initial position or the working position in a predetermined order.

[0005] In the case of such die ejectors, the strip-shaped openings are gradually mechanically worn by the movement of the pin, such that the plates no longer accurately reach their initially determined initial position and working position. Therefore, the service life of the plates is shortened and they must be replaced regularly, which results in downtime and increased maintenance costs. Summary of the Invention

[0006] Therefore, an object of the present invention is to develop a known die ejector such that the plates reliably reach their working positions.

[0007] According to the present invention, this object is solved by a die ejector according to the present invention. A die ejector includes: a chamber that can be loaded with a vacuum, the chamber having a cover plate, the cover plate having a channel, and a surface of the cover plate facing away from the chamber forming a support surface for a carrier provided with dies; a plurality of plates arranged inside the chamber, the plates being able to move back and forth between an initial position and a working position respectively, and the plates having drive grooves, a plate plane of the plates being oriented transversely to the cover plate, and an edge region of the plates facing the cover plate and extending at least approximately perpendicular to the moving direction forming an impact edge, the impact edge being intended to interact with the carrier in order to support the removal of the dies from the carrier, the initial position being shifted rearward relative to the working position towards the inside of the chamber; and a drive element that can be driven by a motor and the drive element penetrates the drive grooves, each of the drive grooves having a drive region, the drive region being designed such that the drive element interacts with the drive region in order to move the plate to be moved from the working position towards the initial position. According to the present invention, a magnet or spring system interacting with an anchoring section of the plate exerts an attractive force or a thrust or a tensile force on the plate pointing towards the working position, and a stop element stops the movement of the plate in the working position, in which the plate abuts against the stop element.

[0008] The present invention relates to a die ejector that includes a chamber that can be loaded with a vacuum, the chamber having a cover plate with a channel. A surface of the cover plate facing away from the chamber forms a support surface for a carrier (preferably a plastic film) provided with dies. The chamber has a vacuum connection for connection to a vacuum source.

[0009] In a preferred embodiment, the chamber is formed by a housing of the die ejector.

[0010] In a preferred embodiment, the cover plate is removable and replaceable, and a part of the carrier with dies thereon rests on the cover plate during operation. The housing preferably has a cylindrical plate carrier, and the cover plate is replaceably arranged on the plate carrier. However, the plate carrier and the cover plate can be integrally formed, whereby the component is replaceable.

[0011] The cover plate preferably contains a centered channel, the shape of which is selected according to the characteristics of the dies (chips) to be processed. Preferably, the channel is rectangular and at least approximately has the size of the dies to be processed.

[0012] In a preferred embodiment, the cover plate has a plurality of through holes designed to suck the carrier when the chamber is applied or loaded with a vacuum, so that the carrier is firmly held on the cover plate during die separation and removal.

[0013] Furthermore, the die ejector includes a plurality of plates arranged inside the chamber, and the plates can move back and forth between an initial position and a working position respectively. The plate plane of the plates is transverse to, preferably at least approximately perpendicular to, the cover plate, in particular its support surface. Preferably, the plates are parallel to each other.

[0014] Hereinafter, the term "transverse" does not necessarily mean perpendicular, but includes perpendicular as a possible direction.

[0015] The longitudinal axis of the die ejector housing preferably extends perpendicular to the support surface.

[0016] The edge section of the plate facing the cover plate forms an impact edge, and the impact edge is intended to interact with the carrier to support the removal of the die from the carrier. The edge area preferably extends at least approximately parallel to the support surface. Preferably, the impact edge has a single continuous section. It can also have several separate sections to provide support when removing dies in several separate areas of the carrier. In a preferred embodiment, the plate has an impact edge as disclosed in document CH 706 280 A1, depending on the characteristics of the die to be processed.

[0017] The term "plate" refers to all objects that can perform the same function. For example, the plate can also be a rod or a beam.

[0018] The initial position is shifted back towards the interior of the chamber relative to the working position.

[0019] The movement of the plate from the initial position to its working position is called rising, and from the working position to its initial position is called falling and defines the movement direction of the plate. Preferably, the movement direction is parallel to the longitudinal axis of the housing and thus perpendicular to the support surface.

[0020] The working position of the plate is a position in which the impact edge of the plate is at least approximately flush with the support surface or above the support surface and at its highest position. The initial position of the plate is a position in which the plate is moved back to the maximum extent relative to its working position into the interior of the chamber. This means that the impact edge of the plate is at its lowest position in the chamber, below the support surface.

[0021] In its working position, the plate is embedded in or penetrates the channel.

[0022] A plurality of edges of the plate form an impact surface, and the shape of the impact surface can be changed by the movement of the plate. The formation of different shapes of the impact surface and its modification support the removal of the die in the target area of the carrier. Therefore, the support during die removal can be flexibly designed according to the characteristics of the die and the carrier to be processed.

[0023] Preferably, in the initial position of the plate, the impact edge lies in a plane that is preferably at least approximately parallel to the support surface. Depending on the desired shape of the impact surface, one or more plates can be held in the initial position and not moved, while moving the plate to be moved.

[0024] In a preferred embodiment, in the working position of the plate, the impact edge is in a plane that is preferably at least approximately parallel to the support surface and extends above the support surface. Thus, the impact surface forms a flat area, and the impact edge pushes against the carrier under the die to be removed with a pressure evenly distributed over this area. This reduces the stress on the die when removing the die from the carrier.

[0025] In a preferred embodiment, sensors can be assigned to the initial position and additional sensors to the working position to determine the position of the plate. The sensors can be used to check whether the plate is in the desired initial or working position and has taken up its correct position in the impact surface. Thus, incorrect positions of the plate can be detected, and possible errors during die removal can be avoided.

[0026] There is a surrounding gap between the impact surface or the plate in the working position and the edge of the channel. The impact area is preferably slightly smaller than the area of the die. Preferably, the surface area of the die projects laterally beyond the impact surface by about 0.05 to 1 mm, particularly preferably 0.3 mm, on all sides. The number of plates depends on the size of the die. For example, three plates can be used for a very small semiconductor die of 3*3 mm.

[0027] The plates can be against each other, but preferably they are separated by a spacing to minimize friction. In a preferred embodiment, the chamber for guiding the plates includes two comb-shaped receiving tracks arranged opposite each other, the cutouts of which extend parallel to the direction of movement on the side of the receiving track facing the inside of the chamber and respectively receive the edge regions of the plates that extend parallel to the direction of movement. For example, if the plates are multi-part or have a large length in the direction of the longitudinal axis of the housing, additional receiving tracks can also be provided to ensure guidance of the plates in additional edge regions. The cutouts are spaced from each other to ensure a predetermined distance between the plates when the plates move. This avoids friction between the plates and ensures that the plates move parallel to each other in the direction of movement. In such an arrangement, the impact edges are at a predetermined distance from each other, preferably an even distance, in order to ensure optimal support of the die when removing the die.

[0028] Furthermore, the die ejector includes a drive element that can be driven by a motor, preferably a stepper motor. Each plate has a drive groove that is penetrated by the drive element. Each drive groove has a drive region that is designed such that the drive element interacts with the drive region to move the plate to be moved from the working position to the initial position.

[0029] According to the present invention, the die ejector includes a magnet that interacts with the anchoring section of the plate and exerts an attractive force on the plate that points towards the working position. In addition, the die ejector includes a stop element that stops the movement of the plate in the working position, where the plate abuts against the stop element.

[0030] Therefore, neither the drive element alone nor the drive element together with the drive groove determines the working position. Instead, the stop element determines the working position. After the movement from the initial position caused by the drive element, the stop element stops the movement of the plate caused by the pulling force of the magnet in the working position. Since the stop element contacts the plate without friction and only has a stop on a wide contact surface, the stop element hardly wears. Therefore, the plate reliably and precisely reaches its working position during long-term use, where the plate is held by the magnet.

[0031] The magnet is assigned to the working position and is used to move the plate from the initial position to the working position and hold it in the working position via its attractive force.

[0032] The anchoring section is the section of the plate that extends between the magnet and the end of the plate facing away from the cover plate. The anchoring section is formed by a lateral area that extends transversely, preferably perpendicular to the longitudinal axis. The lateral area preferably has sections that protrude on both sides of the longitudinal axis.

[0033] In a preferred embodiment, the drive grooves are respectively arranged in the anchoring section. Since there is the largest space in the anchoring section, this arrangement makes it easy to form the drive grooves. It also ensures that the application point of the attractive force and the application point of the force applied by the drive element are close together, and avoids deformation of the plate or unwanted movement of the plate.

[0034] In a preferred embodiment, the magnet is installed in a chamber and extends perpendicular to the movement direction of the plate, such that it at least partially extends over the protruding part of the lateral area. In order to obtain the required attractive force on the outermost anchoring section arranged relative to the central plate, the magnet can extend beyond these anchoring sections.

[0035] In a preferred embodiment, the protruding sections extend symmetrically with respect to the longitudinal axis of the housing, and the magnet at least partially extends symmetrically over the protruding sections. Therefore, a symmetric distribution of the attractive force on the plate can be ensured.

[0036] The magnet can be multi-part so that the distribution of the attractive force is optimized on the anchoring section, in particular so that the attractive force is symmetrically distributed with respect to the longitudinal symmetry plane of the plate. In a particularly preferred embodiment, the magnet comprises at least two magnetic parts, which are arranged symmetrically with respect to the longitudinal symmetry plane of the plate, the longitudinal symmetry plane extending perpendicular to the plate. Preferably, the at least two magnetic parts are arranged in a plane transverse to this symmetry plane. The multi-part design of the magnet also simplifies the replacement of any damaged magnet.

[0037] Preferably, the magnet or (optionally) the magnetic part comprises magnetic blocks that are substantially in contact with each other in order to obtain the same attractive force as a one-piece magnet or magnetic part. However, a gap can be provided between adjacent magnet blocks in order to optimize the distribution of the magnetic force of the magnet or optionally the magnetic part as required. The gap can be filled with a non-magnetic material. The magnet or optionally the magnetic part can have different shapes, preferably in the form of a rod. Optionally, the thickness of the magnet or magnetic part can vary when viewed in a direction transverse to the direction of movement of the plate. This means that the distribution of the attractive force can also be optimized as required.

[0038] In a preferred embodiment, the position of the magnet in the chamber and the shape of the magnet and the anchoring section are designed such that the attractive force exerted on the anchoring section is at least approximately equal for each plate. Thus, the drive element can exert at least approximately the same force on the corresponding drive area against the attractive force of the magnet in order to move the plate to be moved from the working position towards the initial position. This allows for simple control of the movement of the drive element and results in a uniform low wear of the drive element and the drive area, if any.

[0039] Preferably, the anchoring section has grooves to optimize the distribution of the attractive force of the magnet on the plate. In a preferred configuration, grooves, preferably rectangular grooves, can be formed on the protruding part of the transverse area, preferably on the side of the protruding part facing the magnet, for example every other plate.

[0040] In a preferred embodiment, the stop element interacts with the plate in the region of the plate adjacent to the impact edge. This minimizes the distance between the stop element and the impact edge and ensures the precise position of the impact edge in the working position of the plate.

[0041] In a preferred embodiment, the stop element also stops the movement of the plate in its initial position. For the same reasons as described above for the working position, the plate reliably reaches its initial position after the necessary modifications.

[0042] In a preferred embodiment, another stop element stops the movement of the plate at its initial position. Compared to the accuracy in the initial position, a higher accuracy is usually required for the position of the impact edge in the working position. The characteristics of the stop element and the other stop element can be determined according to the desired accuracy, and different manufacturing processes and materials can be selected if necessary. As a result, the cost can be optimized.

[0043] In a preferred embodiment, the stop element can be designed such that it is also used to guide the plate. The same can be true for the other stop element.

[0044] Preferably, the stop element and, if necessary, the other stop element are removably fixed to the housing. For example, the chamber can have two oppositely arranged openings into which the stop element is pushed, and the stop element can also be fixed to the housing using fasteners. The stop element can consist of several parts and can include, for example, a plurality of preferably plate-shaped parts that are stacked on top of each other when viewed in the direction of movement of the plate. Thus, the thickness of the stop element can be adjusted by adjusting the number of these parts, and thereby the position of the plate in the working position can be adjusted. The stop element can also be adjusted, for example, by means of an adjusting screw in order to adjust the position of the plate in the working position. This allows the die ejector to easily adapt to the characteristics of the die to be processed. A similar construction can also be provided for the other stop element.

[0045] In a preferred embodiment, the stop element is designed as a preferably flat bolt that engages through a stop groove of the corresponding plate. The flat bolt has at least one flat first stop side and preferably a second stop side that is parallel to the first stop side. Viewed in the direction of the longitudinal axis, the stop groove extends over a length corresponding to the sum of the thickness of the stop element and the stroke of the plate. In the initial position and in the working position, the first and second stop sides bear against the corresponding stop groove on a wide contact surface in order to stop the plate more reliably. Thus, the accuracy of reaching the working position and the initial position can be increased.

[0046] Preferably, each stop groove has first and second flat edge sections that are formed parallel to the first or second stop side respectively, and the first and second flat edge sections interact with the first and second stop sides to stop the plate more precisely. Thus, the accuracy of reaching the working position and the initial position can be further increased over a longer operating time.

[0047] In a preferred embodiment, there is always a gap between the magnet and the plate. This prevents the plate from hitting the magnet when reaching the working position. Preferably, the gap is an air gap. This prevents mechanical damage to the magnet and reduces the risk of the magnet breaking.

[0048] It is also possible not to provide a gap between the magnet and the plate. In this case, the magnet acts as a stop element. If necessary, the magnet can be protected by a protective layer against mechanical damage.

[0049] Preferably, the plate has a longitudinal region and at least one crossbeam. The at least one crossbeam forms an anchoring section, while the free end of the longitudinal region facing the cover plate forms an impact edge. For example, the plate can be cross-shaped or have two spaced-apart crossbeams that are preferably parallel to each other.

[0050] In a preferred embodiment, the plate is T-shaped. The crossbeam forms an anchoring section, while the free end of the longitudinal region forms an impact edge. The side of the crossbeam facing the magnet is at least approximately parallel to the surface of the magnet facing the anchoring section. Thus, the plate is arranged in the chamber in an inverted T position. The T-shape advantageously combines a wide crossbeam that effectively interacts with the magnet and serves as an anchoring section with a narrow longitudinally extending longitudinal region, which allows for a compact and space-saving design of the housing in the region facing the cover plate, leaving space for other modules near the die ejector.

[0051] In a preferred embodiment, the plate is formed in several parts, preferably two parts, and has a base plate that interacts with the magnet and a support plate that has an impact edge. The base plate contains drive grooves and has an anchoring section, and the support plate can be placed on the base plate via a mechanical connection. The support plate is selected according to the specific application of the die ejector and is mounted on the base plate in a conventional manner without replacing the base plate. This allows the die ejector to easily adapt to the characteristics of the die to be processed, such as the size of the die. The number of support plates can be less than the number of base plates. The support plates can have the same design.

[0052] It should be understood hereinafter that when the plate is in the working position or the initial position, the support plate and the base plate are in the working position or the initial position.

[0053] In a preferred embodiment, the base plate is T-shaped and has a crossbeam and a part of the longitudinal region, while the remaining part of the longitudinal region forms the support plate. The base plates can have the same design.

[0054] In a preferred embodiment, the base plates each have an anchoring section. Preferably, the crossbeam forms the anchoring section.

[0055] In a preferred embodiment, the base plates are guided by receiving tracks, while the support plates are guided by additional receiving tracks of the same design.

[0056] In a preferred embodiment, the support plates each have a stop groove that is penetrated by a stop element. Preferably, the stop groove is formed in the region of the plate adjacent to the impact edge, such that the distance between the stop element and the impact edge is minimized. Thus, an exact position of the impact edge in the working position of the plate can be achieved.

[0057] In a preferred embodiment, the stop element stops the movement of the support plate in its working position and its initial position. Thus, the support plate simultaneously stops the corresponding substrate. However, preferably, additional stop grooves are formed in the substrate, and the additional stop grooves are penetrated by additional stop elements so that the substrate can also be stopped if the support plate is not placed on the specified substrate. In a preferred embodiment, the additional stop element stops the movement of the substrate in its initial position, and the stop element stops the movement of the support plate in its working position.

[0058] In a preferred embodiment, the die ejector includes another magnet assigned to the initial position.

[0059] In addition, each of the drive grooves has another drive region. The other drive region is designed such that the drive element interacts with the other drive region to move the plate to be moved from the initial position towards the working position.

[0060] In a preferred embodiment, the drive grooves of all the plates have the same design.

[0061] If necessary, there is always another gap between the other magnet and the plate to prevent the plate from hitting the other magnet when reaching the initial position. The other gap can also be an air gap. Thus, the other magnet is also protected from mechanical damage, and the risk of the other magnet breaking is reduced.

[0062] The anchoring section of the plate is located between the magnet and the other magnet.

[0063] In a preferred embodiment of the T-shaped plate with a crossbar, the side of the crossbar facing the other magnet can extend at least approximately parallel to the surface of the other magnet facing the anchoring section.

[0064] The other magnet can also be multi-part to optimally distribute the attractive force on the anchoring section. In addition, the multi-part design simplifies the replacement of any damaged magnet. In a particularly preferred embodiment, the other magnet includes at least two additional magnet parts, and the at least two additional magnet parts are symmetrically arranged with respect to the longitudinal symmetry plane of the plate. Preferably, the at least two additional magnet parts are arranged in a plane transverse to the symmetry plane. In a particularly preferred embodiment, the other magnet is provided on the bottom of the chamber.

[0065] Preferably, the other magnet or, if necessary, the plurality of additional magnet parts includes another magnet block in a manner similar to the magnet or the plurality of magnet parts.

[0066] In a preferred embodiment, the magnet and the other magnet are arranged such that they are polarized in opposite polarization directions. Preferably, the polarization directions are at least approximately parallel to the direction of movement. Thus, the magnetic fields of the magnet and the other magnet respectively exert attractive forces on a plate made of a magnetizable material (such as a metal like iron) that are oriented substantially parallel to the direction of movement. The attractive force of the magnet and the attractive force of the other magnet are oriented towards the working position or the initial position. Preferably, the magnet and the other magnet are permanently magnetized.

[0067] In a preferred embodiment having a magnet and the other magnet, the drive element moves the anchoring section of the respective plate to be moved from the initial position towards the working position away from the other magnet towards the magnet, at least until the attractive force of the magnet is greater than the attractive force of the other magnet. Then the plate to be moved is attracted by the magnet and moves to the working position. Conversely, the drive element moves the anchoring section of the respective plate to be moved from the working position towards the initial position away from the magnet towards the other magnet, at least until the attractive force of the other magnet is greater than the attractive force of the magnet. Then, the plate to be moved is attracted by the other magnet and moves to the initial position.

[0068] It is also conceivable to arrange the magnet and the other magnet such that they are polarized in the same polarization direction. This arrangement can be used if the distance between the magnet and the other magnet is designed such that the attractive forces of the magnet and the other magnet do not significantly overlap.

[0069] Preferably, the anchoring section has a groove, preferably a rectangular groove, in its edge region facing the other magnet in order to optimize the attractive force of the other magnet on the plate.

[0070] In a preferred embodiment, the drive element includes a camshaft that is rotatably driven by a motor, and the cams of the camshaft are intended to interact with the drive regions of the plate to be moved and the other drive region. Preferably, one cam interacts with the drive region of a single plate and the other drive region respectively. However, a cam can also interact with the drive regions of two or more plates and the other drive region. The use of a camshaft with cams allows for a quick and easy adjustment of the movement of the plate. Camshafts with different profiles can be pre-manufactured and installed according to the specific application of the die ejector. This embodiment allows the plate to be moved by driving the shaft in a single rotational direction, thus making the control of the shaft particularly easy.

[0071] Such a camshaft can be made of steel, for example, by additive manufacturing.

[0072] In a particularly preferred embodiment, the cams are offset along the circumferential direction of the camshaft such that the plates move between the initial position and the working position in a predetermined order, and vice versa.

[0073] The cam projects radially outward relative to the cylindrical shaft portion of the camshaft, and when viewed in the longitudinal direction of the camshaft, the cams can be arranged one after another, preferably offset in the circumferential direction.

[0074] The cams are preferably toothed and, when viewed in the direction of rotation, each has a front impact side and a rear side. The arrangement of the impact sides of the cams relative to one another determines the sequence of interaction between the cam side and the drive regions of the plate and the other drive region, and thus determines the movement of the plate from the initial position to the working position or from the working position to the initial position.

[0075] The distance measured in the circumferential direction between the impact sides of two consecutive cams, together with the rotational speed of the camshaft, determines the time delay between the movements of the associated plates.

[0076] In a particularly preferred embodiment, the cams are arranged symmetrically with respect to a mirror plane perpendicular to the axis of rotation of the camshaft and passing through the centrally arranged cam. This arrangement of the cams allows the plate to move symmetrically from the initial position to the working position or from the working position to the initial position with respect to the plate assigned to the centrally arranged cam.

[0077] Preferably, as seen in the development of the camshaft, the cams have a V-shaped arrangement, where the central cam forms the tip of the V, and as seen in the direction of rotation, the remaining cams are offset forward. Thus, during the movement from the working position to the initial position, first the outermost plates, which are symmetric with respect to the plate assigned to the centrally arranged cam, can move, and finally the plate assigned to the centrally arranged cam can move. This arrangement allows the film to be gradually peeled off from the side of the core towards the center of the core.

[0078] In a preferred embodiment, the cams have an involute shape. The involute shape of the cams helps to minimize the mutual sliding between the cams and the drive regions and the associated wear and heat generation. Preferably, the impact sides of the cams have an involute shape. However, if the camshaft has to be driven in both rotational directions, an involute shape can also be provided for the back sides of the cams.

[0079] In a preferred embodiment, the drive region is formed by a shoulder formed on the associated plate, and the other drive region is formed by another shoulder formed on the associated plate, which preferably extend transversely to the direction of movement of the plate. "The shoulder and the other shoulder are configured to be transverse to the direction of movement of the plate" means that they can be aligned at any angle according to the geometric requirements of the drive element. By forming the shoulder and the other shoulder substantially at right angles to the direction of movement, it is ensured that the force exerted by the cam on the shoulder or the other shoulder acts as much as possible in the direction of movement, thus almost completely avoiding lateral forces. Therefore, the orientation of the shoulder and the other shoulder is selected such that the friction between the cam and the associated plate is minimized. The associated cam, i.e., the cam assigned to the associated plate, pushes the shoulder when the camshaft rotates and pushes the other shoulder when rotating further.

[0080] In a preferred embodiment, the drive element is designed as a shaft that can be rotatably driven about its axis by a motor, and the outer circumference of the shaft constitutes a control cam located in a plane perpendicular to the axis. Each control cam surrounds a disk-shaped portion of the plane of the shaft having an uneven edge, and the thickness of the disk-shaped portion is such that the control cam contacts only one plate or a plurality of plates. The shaft region having the control cam is preferably designed as a one-piece. However, it is also possible to connect a plurality of separate disks with uneven edges, which form the shaft region having the control cam.

[0081] In this embodiment, the die ejector includes the magnet, and the other magnet, i.e., the magnet assigned to the initial position, can be omitted.

[0082] Each control cam interacts with the drive region of the plate at the contact point. Preferably, each plate is assigned a control cam. However, the control cam can be formed such that it interacts with the drive regions of two or more plates simultaneously.

[0083] Preferably, the drive region is formed in the region of the drive groove facing the bottom of the chamber. In a preferred embodiment, the drive region is formed by a shoulder formed on the plate in question, and the shoulder preferably extends transversely to the direction of movement of the plate, particularly preferably substantially at right angles to the direction of movement of the plate. By forming the shoulder substantially at right angles to the direction of movement, it is ensured that the friction between the control cam and the drive region is minimized.

[0084] When the shaft rotates, the control cam rotates simultaneously. In this way, the movement of the control cam caused by the rotation of the shaft is mechanically transmitted to the plate via the drive region.

[0085] To transfer the plate from the working position to the initial position, the shaft is rotated from the working rotational position in which the plate is in the working position to the initial rotational position in which the plate is in the initial position. The magnet assigned to the working position is used to move the plate from the initial position towards the working position via its attractive force and hold it in the working position. As the shaft rotates, a control cam interacts with the drive regions of one or more associated plates respectively, to push the one or more plates towards the initial position based on the increasing radius of the control cam and overcome the attractive force of the magnet.

[0086] The movement of the plate from the initial position to the working position is also controlled via the control cam.

[0087] The distance measured between the axis of the shaft and the contact point of the drive region is called the effective radius of the control cam. The effective radius of the corresponding control cam in the working rotational position is smaller than the effective radius in the initial rotational position.

[0088] The part of the control cam that contacts the drive region of the plate when the shaft rotates is called the effective section of the control cam. Thus, in the effective section of the control cam, the radius of the control cam measured between the axis of the shaft and the outer circumference of the control cam is equal to the effective radius.

[0089] The part of the control cam that does not contact the drive region is called the passive part of the control cam. This is the case for parts with a radius smaller than the effective radius, so when the shaft rotates, the control cam does not contact the drive region of the relevant plate. The same is true for the parts of the control cam that do not contact the drive region, because the shaft has not rotated to that part.

[0090] When the shaft is rotated from the working rotational position to the initial rotational position, the effective section of the control cam interacts with the drive region of the plate. The control cam is designed such that when the shaft is rotated from the working rotational position to the initial rotational position, the radius of the corresponding control cam increases. As the shaft continues to rotate, the control cam pushes the one or more plates assigned to it further and further towards the initial position, while the magnet simultaneously exerts an increasing attractive force towards the working position. As a result, the plate descends from the working position and remains in contact with the relevant control cam.

[0091] The radius preferably increases continuously between the working position and the initial position to allow the plate to move continuously as the shaft rotates.

[0092] To transfer the plate from the initial position to the working position, the shaft is rotated from the initial rotational position to the working rotational position. As the shaft rotates, a control cam interacts with the drive regions of one or more associated plates respectively, and due to the decreasing radius of the control cam, the one or more plates are pulled towards the working position by the attractive force of the magnet. When the working position is reached, the plate abuts against the stop element and is held in the working position by the magnet.

[0093] In a preferred embodiment, in the working rotational position, there is a gap between the drive region of the plate and the control cam. This means that the effective radius is greater than the radius of the control cam, so that the plate to be moved has no contact point with the shaft in the working position. This ensures that the plate stops at the working position by means of the stop element and no longer contacts the control cam. Thus, the plates reliably reach the working position because they can rest against the stop element.

[0094] In this embodiment, the passive part of the control cam in the working position is respectively opposite to the drive region of the plate. When the shaft is rotated from the working rotational position to the initial rotational position, the control cam initially has no contact point with the associated drive region.

[0095] Since the radius of the corresponding control cam increases as the shaft rotates from the working position to the initial position, the control cam contacts the plate to be moved at its drive region as the shaft continues to rotate. When the contact point is reached, the drive region begins to interact with the effective section of the control cam. Depending on the desired start of the movement of the plate from the working rotational position to the initial rotational position, the start of the effective section of the control cam is formed. The radius of the corresponding control cam continues to increase such that the plate is pushed from the working position towards the initial position against the attraction of the magnet due to the increase in the radius of the control cam.

[0096] The effective section of each control cam extends from a first radius assigned to the working position to a larger second radius assigned to the initial position. Preferably, the radius in the effective section continues to increase and the control cam forms a substantially spiral arc.

[0097] In the working rotational position, the plate is in the working position and the first radius of each cam is less than the effective radius of each cam. This corresponds to a rotational position of the shaft in which the passive part of the control cam is opposite to the drive region, i.e., no plate contacts the control cam. The plate rests against the stop element and there is a gap between the control cam and the drive region.

[0098] In the initial rotational position, the plate is in the initial position and the second radius is respectively the same size as the effective radius of the control cam. This corresponds to a rotational position of the shaft in which the drive region has reached the end of the effective section of the control cam.

[0099] In the passive part, the radius can decrease continuously or stepwise from the second radius to the first radius. For example, the passive part can be partially straight.

[0100] The rotation of the shaft can be controlled by motor control according to the desired movement of the plate. The rotation of the shaft can thus be designed to be continuous or stepwise in one rotational direction. In a preferred embodiment, the shaft is driven back and forth between the initial rotational position and the working rotational position.

[0101] In a preferred embodiment, the control cams are formed along the circumferential direction of the shaft such that the plates move between the initial position and the working position in a predetermined sequence and vice versa.

[0102] In a particularly preferred embodiment, each control cam is symmetric with respect to a mirror plane extending through the centrally arranged control cam, the mirror plane extending perpendicular to the axis of rotation of the shaft. This design of the control cams allows the plates to move symmetrically from the initial position to the working position or from the working position to the initial position with respect to the plate assigned to the centrally arranged control cam.

[0103] Preferably, the effective section of the control cam as seen in the unfolding of the shaft has a V-shaped arrangement, wherein the central effective section forms the tip of the V-shape, and the remaining effective sections are offset forward with respect to the tip of the V-shape when viewed in the direction from the working rotational position to the initial rotational position. Thus, during the movement from the working position to the initial position, first the outermost plates that are symmetric with respect to the plate assigned to the centrally arranged cam can move, and finally the plate assigned to the centrally arranged control cam can move. This arrangement allows the foil / membrane to be gradually separated from the core from the side of the core towards the center of the core.

[0104] In a preferred embodiment, one end face of the shaft has a groove centered on the axis, the groove being arcuate and groove-shaped to receive a pin that is fixed in position relative to the chamber. One end of the groove forms a first rotational stop of the shaft assigned to the working rotational position, and the other end forms a second rotational stop of the shaft assigned to the starting rotational position. Thus, the rotation of the shaft can be reliably stopped in the working rotational position and the initial rotational position. The first and second rotational stops are designed such that the pin contacts the first and second rotational stops respectively only when all the plates have reached their working positions and their initial positions respectively.

[0105] In a preferred embodiment form, the control cams are arranged such that the plates move between the initial position and the working position in a predetermined sequence and vice versa.

[0106] In a preferred configuration, the core ejector includes a spring system that interacts with the anchoring section of the plate and exerts a thrust or a pull force on the plate directed towards the working position. There may be no magnets and other magnets here. If it is necessary to avoid possible interactions between the magnetic field and other components inside or outside the core ejector, a core ejector without any magnets is an advantageous arrangement.

[0107] Furthermore, the drive element is designed as a shaft which is driven by a motor and rotatable about its axis. The shaft may be configured in the same way as the shaft in the previous embodiments, and the outer circumference of the shaft constitutes a control cam in a plane perpendicular to the axis. Each control cam has the same characteristics and acts on the drive region of the plate as described above.

[0108] The spring system may be arranged at the bottom of the chamber and is used to move the plate from the initial position to the working position via its thrust and hold it in the working position.

[0109] The spring system may be arranged on the side of the chamber opposite to the bottom and is used to move the plate from the initial position towards the working position via its pulling force and hold the plate in the working position.

[0110] The spring system may be designed as a plurality of spring strips arranged at the bottom of the chamber, and one spring strip is assigned to one plate and interacts with one plate.

[0111] The spring system may preferably include comb-shaped bent spring tongues extending from the fixed plate, and each spring tongue interacts with one plate.

[0112] Other spring systems are also suitable as long as a thrust towards the working position can be applied to the corresponding plate.

[0113] The thrust causes the drive region of the plate to be moved to remain in contact with the outer circumference of the shaft during rotation of the shaft, i.e., in contact with the control cam assigned to the plate to be moved at at least one contact point, as long as the plate to be moved has not reached the stop element. Once the plate reaches the stop element, the shaft is lifted from the drive region of the plate to be moved. The plate held in the initial position is held in the initial position by the shaft via the associated control cam.

[0114] According to the present invention, the thrust includes not only positive values but also negative values, such that the negative thrust is equal to the positive pulling force.

[0115] According to the present invention, the spring system includes a compression spring or an attracting spring or a combination thereof to apply an attractive force (preferably on the plate) towards the working position. Description of the Drawings

[0116] Further advantages and features of the present invention can be seen in the following description of the exemplary embodiments, which are explained using the drawings, wherein:

[0117] Figure 1 A longitudinal cross-section of a first embodiment of a die ejector according to the present invention is shown in a perspective view;

[0118] Figure 2 Shown mounted as in Figure 1Perspective view of the camshaft in the die ejector shown;

[0119] Figure 3 Cross-section along the longitudinal direction showing a part of the second embodiment of the die ejector according to the present invention; and

[0120] Figure 4 Shown built-in as Figure 3 Perspective view of the shaft in the die ejector shown. Detailed Description

[0121] In the first embodiment, the die ejector 2 shown, as Figure 1 includes a chamber 4 which can be loaded with vacuum and is formed by a multi-part housing 6 defining a longitudinal axis L. The housing 6 includes a parallelepiped housing part 8 which includes a housing cover 16, a base 12 hermetically arranged perpendicular to the longitudinal axis L, two side walls 14 or 14', an end wall (not shown) and a rear wall (not shown). The housing cover 16 is fixed to the housing part 8 in a hermetic manner and has a circular opening 24 from which a tube part 22 extending along the longitudinal axis L projects.

[0122] Furthermore, the housing 6 includes a flange 36 having a cylindrical channel which is pushed onto the tube part 22. In the first end region of the flange facing the housing cover 16, the diameter of the channel is slightly larger than the outer diameter of the tube part 22. In the first end region of the flange, the flange 36 abuts against the tube part 22 in a hermetic manner via an O-ring 34 arranged in the flange 36. In the second end region of the flange facing away from the housing cover 16, the diameter of the channel is larger than the outer diameter of the tube part 22 to form a circumferential groove 38 intended to allow the reception of a cylindrical plate carrier 30.

[0123] The housing 6 also includes a cylindrical plate carrier 30 on which a cover plate 40 is hermetically and replaceably arranged via a further O-ring 42. The plate carrier 30 is pushed onto the tube part 22, pushed into the circumferential groove 38 and abuts against the tube part 22 in a hermetic manner via another O-ring 44 arranged in the flange 36 in the assembled state.

[0124] The chamber 4 has a vacuum connection 46 for connection to a vacuum source.

[0125] The cover plate 40 has a channel 50, and the surface of the cover plate 40 facing away from the chamber 4 forms a support surface 52 for a carrier provided with dies, which carrier is not shown in Figure 1As shown. The support surface 52 extends perpendicular to the longitudinal axis L of the housing 6 of the die ejector 2. Additionally, the cover plate 40 has a plurality of through-holes 54 arranged around the channel 50, which are used to suck the carrier when a vacuum is applied to the chamber 4, so that the carrier is firmly held on the cover plate 40 during die separation and removal.

[0126] The die ejector 2 further includes a plurality of plates 56 arranged inside the chamber 4 parallel to each other and parallel to the longitudinal axis L of the housing 6, and the plurality of plates can move back and forth along the longitudinal axis L in the moving direction B between an initial position 58 and a working position 60 respectively. The plate planes of the plates 56 are respectively oriented perpendicular to the cover plate 40 and the side walls 14 and 14'. Due to this design, the plate planes are thus parallel to the longitudinal axis L.

[0127] The housing cover 16 has two mounting grooves 18 and 18' on its side facing the inside of the housing part 8, which extend parallel to the side walls and are symmetrically arranged with respect to the longitudinal symmetry plane of the plate containing the longitudinal axis L. A multi-part magnet 20 is arranged in each mounting groove. Another multi-part magnet 10 is arranged on the bottom.

[0128] The magnet 20 is assigned to the working position 60, and the other magnet 10 is assigned to the initial position 58. The magnet 20 and the other magnet 10 extend perpendicular to the plate plane and are permanently polarized in opposite polarization directions marked by S-N and N-S at least parallel to the moving direction B. Therefore, the magnetic fields of the magnet 20 and the other magnet 10 respectively exert an attractive force F or F' on the plate 56, and the attractive force is generally parallel to the moving direction B.

[0129] The plate 56 is formed in two parts, and each plate includes: a base plate 68, which contains a driving groove 70; and a support plate 72, which is placed on the base plate 68 and is connected to the base plate 68 through a mechanical connection 73. The driving grooves of all the base plates 68 have the same design.

[0130] The base plate 68 is T-shaped and each has a longitudinal region 75 and a cross beam, and the support plate 72 is fixed on the longitudinal region. The cross beam forms an anchoring section 74. The side surface 66 of the cross beam facing the other magnet 10 extends parallel to the surface of the other magnet 10 facing the cross beam, and the side surface 64 of the cross beam facing the magnet 20 extends parallel to the surface of the magnet 20 facing the cross beam.

[0131] The edge section of the support plate 72 facing the cover plate 40 forms an impact edge 77, which is intended to interact with the carrier to support the removal of the die from the carrier. Each support plate 72 has a stop groove 76, and the stop groove is penetrated by a stop element 78. The stop grooves 76 of all the support plates 72 have the same design.

[0132] The stop element 78 is designed as a flat bolt that penetrates the stop groove 76 of the corresponding plate 56. The flat bolt has a first flat stop side 78a and a second stop side 78b parallel to the first stop side. Viewed in the direction of the longitudinal axis L, the stop groove 76 extends over a length corresponding to the sum of the thickness of the stop element 78 and the stroke of the plate 56.

[0133] In addition, each of the base plates includes two further stop grooves 80 formed in its anchoring section, which are penetrated by another stop element 82 in the form of a bolt. Each of the base plates 68 also includes in its longitudinal region 75 a slot-shaped groove 84, which is penetrated by a pin-shaped guiding element 86. The groove 84 is used to guide the movement of the longitudinal region 75 such that the movement direction B of the plate 56 remains parallel to the longitudinal axis L. All the grooves 84 of the base plates 68 have the same design.

[0134] To guide the base plates 68, two comb-shaped receiving tracks 90 are provided, which are arranged opposite each other on the side walls 14 or 14', and whose cutouts extend parallel to the movement direction B on the side facing the interior of the chamber of the receiving track 90. The cutouts each receive the edge region of the base plate 68 extending parallel to the movement direction, and are designed to be spaced apart from each other such that a predetermined distance between the base plates 68 is ensured even when the plate 56 moves.

[0135] To guide the base plates 68, the tube part 22 also includes two further receiving tracks 92 arranged on opposite sides, which are designed in the same way as the receiving tracks 90.

[0136] The drive grooves 70 are penetrated by a drive element 100 and each have a drive region 102 and another drive region 104. The drive element 100 is designed as a camshaft 100, and its toothed cams 106 interact with the drive region 102 and the other drive region 104 of the plate 56 to be moved.

[0137] The drive region 102 and the other drive region 104 are each formed by a shoulder 102 or another shoulder 104 formed on the plate 56 and extending transversely to the movement direction B of the plate 56.

[0138] The camshaft 100 is driven by a motor in one rotational direction D.

[0139] Figure 2 The shown camshaft 100 includes a cylindrical shaft portion 110, which respectively has a first shaft hub 112 and a second shaft hub 114. In the assembled state, the first shaft hub 112 is rotatably and slidably arranged in the end wall of the housing 6, and the second shaft hub 114 is rotatably and slidably arranged in the rear wall of the housing 6.

[0140] The cams 106 are located between the first hub 112 and the second hub 114 and project radially outwardly relative to the shaft member 110. These cams 106 are arranged symmetrically with respect to a mirror plane extending through the centrally arranged cams, the mirror plane being perpendicular to the axis of rotation H of the camshaft 100. The cams 106, as seen in the development of the camshaft 100, have a V-shaped arrangement, where the central cam forms the tip of the V, and, when viewed in the direction of rotation, the cams 106 are offset forward.

[0141] When viewed in the direction of rotation D, each of the cams 106 has a front impact side 116 which is shaped as an involute shape. The impact sides 116 of two consecutive cams 106 show a distance A measured in the circumferential direction.

[0142] Figure 1 The shown arrangement of the plates 56 corresponds to the momentary accommodation of the die ejector 2, where all the plates 56 are in the working position 60 and bear against the stop element 78. The impact edge 77 projects beyond the support surface 52. When the camshaft 100 rotates in the direction of rotation D, the impact side 116 interacts with the respective shoulder 102 to move the plate 56 to be moved from the working position 60 towards the initial position 58.

[0143] The arrangement of the impact sides 116 of the cams 106 relative to each other determines the sequence of interaction of the impact sides 116 with the shoulders 102. Since all the drive grooves of the base plates 68 have the same design and the cams 106 have a V-shaped arrangement, as seen in the development of the camshaft 100, the two outermost plates 56 symmetric with respect to the plate 56 assigned to the centrally arranged cam first move from the working position 60 towards the initial position 58. The interaction of the impact side 116 with the shoulder 102 occurs at least until the attractive force F of another magnet 10 is greater than the attractive force F' of the magnet 20. The plate 56 then moves towards the initial position 58 under the attractive force F of another magnet 10.

[0144] As the camshaft 100 continues to rotate, the next impact sides 116, when viewed in the circumferential direction of the camshaft 100, interact with the shoulders 102 of the two outermost plates 56 symmetric with respect to the plate 56 assigned to the centrally arranged cam and move the said outermost plates from the working position 60 towards the initial position 58.

[0145] Finally, the plate 56 assigned to the centrally arranged cam moves from the working position 60 towards the initial position 58.

[0146] As the camshaft 100 continues to rotate in the rotational direction D, the impact side 116 interacts with the other shoulder 104 to move the plate 56 to be moved from the initial position 58 towards the working position 60. As already explained, after the necessary modifications, first, the two outermost plates 56, which are symmetric with respect to the plate 56 assigned to the centrally arranged cam 106, move from the initial position 58 towards the working position 60.

[0147] In a second embodiment of the die ejector 2 according to Figure 3 , the housing 6 is Figure 1 the same, but only the housing part 8 with the interior of the chamber 4 and the plates 56 is shown. In the following, the same reference numerals are used for parts having the same functions as in the first embodiment. Additionally, the structure of the second embodiment is similar to the first embodiment. Therefore, the main differences are described below.

[0148] Figure 3 The arrangement of the plates 56 shown corresponds to the momentary accommodation of the die ejector, and the plates 56 shown are in the working position 60. In Figure 3 the support surface 52 is only shown in dashed lines.

[0149] A multi-part magnet 20 is assigned to the working position 60 of the plate 56, and the multi-part magnet is arranged in the mounting groove 18 or 18'. Contrary to Figure 1 the die ejector shown, Figure 3 the base 12 of the die ejector shown does not have an additional magnet, and thus no additional magnet is assigned to the initial position 58. Therefore, the magnetic field of the magnet 20 exerts an attractive force F' on the plate 56, and the attractive force is oriented substantially parallel to the movement direction B. There is a gap 118 between the magnet 20 and the plate 56, and the plate is stopped in the working position 60 by the stop element 78 and held in the working position 60 by the magnet 20.

[0150] The drive grooves 70 are penetrated by the drive element 100 and each have a drive region 102. The drive element 100 is designed as a shaft 100, which interacts with the drive region 102 of the plate 56 to be moved at the contact point 103 and is driven by a motor.

[0151] Each drive region 102 is formed by a shoulder 102 formed on the plate 56 and extending perpendicular to the movement direction B of the plate 56.

[0152] In combination with Figure 4 the design of the shaft 100 is explained in more detail. The shaft 100 includes a cylindrical shaft portion 110, which is respectively arranged between the first hub 112 and the second hub 114. When assembled, the first hub 112 rotates slidably in the end wall, while the second hub 114 rotates slidably in the rear wall.

[0153] The outer periphery of the shaft member 110 constitutes a control cam 122 in a plane perpendicular to the axis of rotation H, and the control cam is intended to interact with the drive region 102 of the plate 56 at the contact point 103. The control cam 122 is symmetric in pairs with respect to a mirror plane extending through the centrally arranged control cam, and the mirror plane extends perpendicular to the axis of rotation H of the shaft 100.

[0154] When the shaft 100 rotates, the section of the control cam 122 where the control cam contacts the drive region 102 of the associated plate 56 is referred to as the effective section 124 of the control cam 122.

[0155] As seen in the development of the shaft, the effective section 124 of the control cam 122 has a V-shaped arrangement, where the central effective section forms the tip of the V, and the other effective sections 124 are offset forward relative to the tip of the V when viewed in the rotational direction S from the working position to the initial position. The rotational direction W indicates the rotational direction from the initial rotational position to the working rotational position.

[0156] In the effective section 124 of the control cam (extending from point A to point C in Figure 4 ), the radius R continuously increases from a first radius R1 corresponding to point A to a larger second radius R2 corresponding to point C. The radii R1 and R2 are respectively assigned to the working position 60 and the initial position 58 of the corresponding plate 56. The effective section 124 forms a substantially helical arc of the control cam 122.

[0157] One end face 128 of the shaft 100 has an arcuate groove 130 centered on the axis of rotation H to accommodate a pin 131 fixedly arranged relative to the chamber position. One end 132 of the groove 130 forms a first rotational stop 134 of the shaft 100 assigned to the working rotational position, and the other end 136 forms a second rotational stop 138 of the shaft 100 assigned to the initial rotational position.

[0158] To transfer the plate 56 from the working position 60 to the initial position 58, the shaft 100 is rotated in a rotational direction S from the working rotational position where the plate 56 is in the working position 60 to the initial rotational position where the plate 56 is in the initial position 58. In Figure 3 , the shaft 100 is shown in the working rotational position.

[0159] The control cam 122 is designed such that when the shaft 100 is rotated from the working rotational position to the initial rotational position, the radius of the corresponding control cam increases. The radius continuously increases between the working position and the initial position to allow the plate 56 to move continuously as the shaft 100 rotates.

[0160] When the shaft 100 is rotated from the working rotational position to the initial rotational position, the control cam 122 contacts the drive region 102 of the associated plate 56.

[0161] As the shaft 100 continues to rotate, the control cam thus pushes the plate 56 assigned to it further and further away from the initial position 58, and the magnet 20 simultaneously exerts an attractive force F' towards the working position 60. As a result, the plate 56 descends from the working position 60, and the plate 56 remains in contact with the associated control cam 122.

[0162] To move the plate 56 from the initial position 58 to the working position 60, the shaft 100 is rotated in a direction opposite to the rotation direction S.

[0163] The shaft 100 is driven back and forth by a motor between the initial rotation position and the working rotation position.

Claims

1. A die ejector (2), comprising: A chamber (4) capable of being subjected to vacuum, the chamber having a cover plate (40) having a channel, the surface of the cover plate facing away from the chamber (4) forming a support surface (52) for a carrier on which a tube die is arranged; a plurality of plates (56) arranged inside the chamber (4), the plates being movable back and forth between an initial position (58) and a working position (60), the plates having drive grooves (70), the plate planes of the plates being oriented transversely to the cover plate (40), and edge regions of the plates extending at least approximately perpendicularly to the movement direction and facing the cover plate forming impact edges (77), the impact edges being intended to interact with a carrier in order to support removal of a die from the carrier, the initial position (58) being set back relative to the working position (60) towards the interior of the chamber (4); and a drive element (100) which can be driven by a motor and which penetrates the drive grooves (70), the drive grooves (70) each having a drive area (102) which is designed such that the drive element (100) interacts with the drive area (102) in order to move the plate (56) to be moved from the working position (60) towards the initial position (58), It is characterized in that A magnet (20) or a spring system interacting with the anchoring section (74) of the plate (56) exerts an attractive force (F') or a thrust or pull force on the plate (56) directed toward the working position (60), and a stop element (78) stops the movement of the plate (56) in the working position (60), in which the plate (56) abuts against the stop element (78).

2. The die ejector (2) according to claim 1, characterized in that The stop element (78) also stops the movement of the plate (56) in its initial position (58).

3. The die ejector (2) according to claim 1 or 2, characterized in that: The locking element (78) is designed as a pin and penetrates the locking recess (70) of the plate (56).

4. The die ejector (2) according to claim 1 or 2, characterized in that: In the case of a magnet (20), there is always an air gap between the magnet (20) and the plate (56).

5. The die ejector (2) according to claim 1 or 2, characterized in that: The plate (56) is T-shaped, and a crossbeam of the T-shaped plate forms the anchoring section (74), and in the case of a magnet (20), the side of the crossbeam facing the magnet (20) or in the case of a spring system, the side of the crossbeam facing the spring system extends at least approximately parallel to the surface of the magnet (20) or the spring system facing the anchoring section (74).

6. The die ejector (2) according to claim 1, characterized in that The drive recesses (70) each have a further drive region (104) designed such that the drive element (100) interacts with the further drive region (104) in order to move the plate (56) to be moved from the initial position (58) towards the working position (60), wherein in the case of a magnet (20), a further magnet (10) is assigned to the initial position (58), and the anchoring section (74) is located between the magnet (20) and the further magnet (10), and The drive element (100) moves the anchoring section (74) of the respective plate (56) to be moved from the initial position (58) toward the working position (60) away from the other magnet (10) toward the magnet (20), at least until the attractive force (F') of the magnet (20) is greater than the attractive force (F) of the other magnet (10), and the plate (56) to be moved is then moved into the working position (60) under the attractive force (F') of the magnet (20), and vice versa, so that the plate (56) moves from the working position (60) toward the initial position (58) away from the magnet (20) toward the other magnet (10).

7. The die ejector (2) according to claim 6, characterized in that The drive element (100) comprises a camshaft (100) which is rotatably driven about its axis by means of a motor, the cam (106) of which is intended to interact with the drive region (102) and the further drive region (104) of the plate (56) to be moved.

8. The die ejector (2) according to claim 7, characterized in that The cams (106) are arranged along the circumferential direction of the camshaft (100) so that the plate (56) moves between the initial position (58) and the working position (60), and vice versa, in a predetermined sequence.

9. The die ejector (2) according to claim 7 or 8, characterized in that The cam (106) has an involute shape.

10. The die ejector (2) according to claim 7 or 8, characterized in that The drive region (102) and the further drive region (104) are each formed by a shoulder formed on the corresponding plate (56), the shoulder extending transversely to the movement direction of the plate (56), and when the camshaft (100) rotates, the cam (106) assigned to the corresponding plate (56) pushes the corresponding shoulder.

11. The die ejector (2) according to claim 1, characterized in that: The drive element (100) comprises a shaft which is rotatably driven about its axis by means of a motor, the outer circumference of the shaft forming a control cam (122) which is located in a plane extending perpendicularly to the axis, and the shaft is rotated from a working rotational position in which the plate (56) is in the working position to an initial rotational position in which the plate (56) is in the initial position for transferring the plate (56) from the working position (60) to the initial position (58), wherein one control cam (122) interacts with the drive region (102) of one or more associated plates in order to push or pull the one or more plates (56) towards the initial position (58) due to the increase in radius of the control cam (122) in the case of a magnet against the attractive force (F') of the magnet (20) or in the case of a spring system against the thrust or pull of the spring system.

12. The die ejector (2) according to claim 11, characterized in that In the operating rotational position, there is in each case a gap between the drive region (102) of the plate and the control cam (122).

13. The die ejector (2) according to claim 11 or 12, characterized in that The shaft is driven back and forth between the initial rotational position and the working rotational position.

14. The die ejector (2) according to claim 13, characterized in that The end surface (128) of the shaft has a groove (130) centered on the axis, the groove is in the shape of an arc and a groove for receiving a pin (131), the pin is arranged in a fixed position relative to the chamber, one end of the groove (130) forms a first rotation stop (134) of the shaft assigned to the working rotation position, and the other end forms a second rotation stop (138) of the shaft assigned to the initial rotation position.

15. The die ejector (2) according to claim 11 or 12, characterized in that The control cam (122) is designed to move the plate (56) between the initial position (58) and the working position (60), and vice versa, in a predetermined sequence.

16. The die ejector (2) according to claim 1 or 2, characterized in that The plate (56) is designed in multiple parts, having a base plate (68) with the anchoring section (74) and the drive groove (70), and a support plate (72) which can be placed on the base plate (68) and forms the impact edge (77), and the stop element (78) interacts with the support plate (72).

17. The die ejector (2) according to claim 1 or 2, characterized in that In the case of a spring system, the spring system is arranged on the bottom of the chamber in order to move the plate from the initial position towards the working position via the impact force of the spring system and to hold the plate in the working position.

18. The die ejector (2) according to claim 1 or 2, characterized in that In the case of a spring system, the spring system is formed as a plurality of spring strips arranged on the bottom of the chamber, each spring strip being assigned to a plate and interacting with the latter.

19. The die ejector (2) according to claim 1 or 2, characterized in that In the case of a spring system, the spring system is arranged on the side of the chamber opposite the bottom and serves to move the plate from the initial position toward the working position via the tension of the spring system and to hold the plate in the working position.

20. The die ejector (2) according to claim 1 or 2, characterized in that In the case of a spring system, the spring system comprises comb-like curved spring tongues which protrude from a fastening plate and which each interact with a plate.

21. The die ejector (2) according to claim 1 or 2, characterized in that In case of a spring system, the spring system comprises a compression spring or a tension spring or a combination thereof in order to exert an attractive force directed towards the working position.

22. The die ejector (2) according to claim 3, characterized in that The pin is flat.

23. The die ejector (2) according to claim 16, characterized in that The plate (56) is designed to have two parts.

24. The die ejector (2) according to claim 21, characterized in that An attractive force is exerted on the plates.

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