Workstation for a thermoforming packaging machine and thermoforming packaging machine comprising a workstation

Abstract

Workstation (19) for a thermoforming packaging machine (1), comprising a tool upper part (21), a tool lower part (22) removable from the workstation (19) in a change direction (28), a changing device (29) for tilting the tool lower part (22) from an operating position (30) to a change position (28), characterized in that the tool lower part (22) is mounted on a first support element (31) of the changing device (29), wherein the first support element (31) is rotatably mounted on the workstation (19) about a first tilting axis (32), wherein the changing device (29) has a first cam (33), and wherein the changing device (29) is configured to tilt the first support element (31) about the first tilting axis (32) by rotating the first cam (33) about a first axis of rotation (34) arranged separately from the first tilting axis (32).

Description

The present invention relates to a workstation for a thermoform packaging machine and a thermoform packaging machine comprising a workstation.Thermoform packaging machines are generally provided with a forming station and a sealing station, which each comprise format-dependent replaceable lower tool parts. The lower tool parts or a mold plate or a sealing plate weigh up to 250 kg and their removal from the thermoform packaging machines can be problematic, in particular because of the high weight.DE 10 2017 107 243 A1 discloses a packaging machine with tiltable tool drawer. In DE 10 2017 107 243 A1, a tilting mechanism is provided for a tool changing operation, which mechanism is configured to bring the tool lower part from its operating position into a tilted position. The tilting mechanism comprises a tilting unit, a pivoting unit and a base plate pivotably coupled thereto. The lower tool part is arranged detachably on the base plate. In the tilted position, the base plate is arranged together with the lower tool part inclined relative to a horizontal reference plane. The tool base is pulled down from the base of the tilting mechanism onto a rail device. The rail device is fastened laterally releasably on the machine frame of the packaging machine in a receptacle. It is disadvantageous here that the tilting mechanism has many components and accordingly its removal is complex and expensive. Furthermore, the rail device is mounted on the packaging machine separately from the tilting mechanism and the rail device projects out of the packaging machine in its tilted position, which takes up a large amount of space in the packaging installation for the maintenance work and the changing operation of the tool lower part.In addition, tool lower parts can rest on a seal or a round cord in the installed state in thermoform packaging machines. When the lower tool part rests on a seal, the friction between the lower tool part and the seal is sometimes so great that the lower tool part cannot be laterally displaced in order to remove it from the thermoform packaging machine. Here, there is also the risk that the seal will be broken if the lower tool part is not moved upwards before it is laterally displaced. Consequently, in a work station in which the tool lower part rests on a seal or is surrounded by a seal, the tool lower part must be raised in order to separate the tool lower part from the seal or to separate it from the seal. Lifting devices with pneumatic cylinders are known from the prior art for lifting the lower tool part before it is taken out laterally from the work station. Such lifting devices include complex components and require control equipment for operation. Thus, such lifting devices are cost-intensive and construction-intensive.Accordingly, the object of the invention is to eliminate at least some of the above mentioned disadvantages. This object is achieved in each case by a workstation for a thermoform packaging machine according to claim 1 or by a thermoform packaging machine comprising a workstation according to claim 15.The invention relates to a workstation for a thermoform packaging machine, comprising a tool upper part, a tool lower part which can be removed from the workstation in a changing direction, a changing device for tilting the tool lower part from an operating position to a changing position, wherein the tool lower part is mounted on a first support element of the changing device, wherein the first support element is mounted on the workstation such that it can rotate about a first tilting axis, wherein the changing device has a first cam, and wherein the changing device is configured to tilt the first support element about the first tilting axis by rotating the first cam about a first rotation axis which is arranged separately from the first tilting axis. The lower tool part can lie on a seal in the operating position. The alternating direction can be perpendicular to a transport direction of a film web to be processed in the work station. The change direction may be the direction toward an operator side. In the changing position, the lower tool part can be arranged inclined relative to a horizontal reference plane. The first cam may be an eccentric. The cam may be mounted on a camshaft. By rotating the first cam about the axis of rotation, the tool lower part can be tilted from the operating position to the changing position.The invention enables simple changing of the lower tool part, because in the tilted position the lower tool part is held away from the seal arranged below the tool part.Furthermore, the invention makes it possible to produce the changing device in a simple and cost-effective manner, since the changing device for tilting the lower tool part is constructed with a simple cam mechanism.Furthermore, the invention makes it possible to mount the lower tool part in the work station on a frame element, preferably on a base plate or on a yoke of the work station, and to tilt the lower tool part from the operating position to the changing position independently of the frame element. This saves space in the packaging plant for the changing process of the lower tool part.Moreover, the invention enables better protection for the seals in the work station, since tilting the lower tool part separately from the frame element prevents the lower tool part from rubbing too strongly on the seal. This would not be possible if the lower tool part is tilted together with the frame element, since the seals are located between the lower tool part and the frame element.A further advantage of the invention is provided if the changing device or the support element can be locked in the operating position by interaction of the first cam with the first support element. This obviates the need for an additional locking unit to secure the changing device in the operating position.Advantageously, by a rotational movement of the first cam from a first latching position to a second latching position, the first support element is tiltable from a first position to a second position. When the first cam is in the second locking position, the first support element is tilted upward. As a result, the lower tool part can also be tilted upward or moved into the changing position. The lower tool part can be held away from the seal in the change position. When the tool base is held away from the seal, the tool base can easily be removed from the work station, since the tool base no longer rubs against the seal.Advantageously, the first support element can be brought from the first position into the second position only with a tilting movement, or the lower tool part can be brought from the operating position into the changing position, in particular without a vertical upward movement. As a result, the changing device can be constructed more stably and with comparatively few components.Advantageously, the first tilting axis can be stationary at the work station, preferably at least during the entire rotational movement of the first cam between the first locking position and the second locking position. As a result, the tilting mechanism of the changing device can be constructed in a more stable and simple manner. The tilting axis can be mounted in a pivot bearing arranged above the frame element, wherein the frame element is arranged above a base element of a lifting mechanism of the work station supporting the frame element.Advantageously, the first support element may be lockable in cooperation with the first cam in the first position when the first cam is in the first locking position, and / or the first support element may be lockable in cooperation with the first cam in the second position when the first cam is in the second locking position. By means of one of these measures, the changing device can serve both as a tilting unit for tilting and simply changing the lower tool part and as a locking unit for locking the supporting element carrying the lower tool part. Locking the first support member in the second position may facilitate changing the tool base by stabilizing the support member in its second position.In an embodiment, the first support member may include a first main body and a first hook-shaped end extending from the first main body of the first support member. The tool bottom may be slidable on the main body, particularly when the first support member is in the first position and the tool bottom is in the changing position. By the first hook-shaped end of the first support member, the first cam and the first support member can function as both a locking unit and a tilting unit.In the first position, a first portion of the first cam may be received in a first receiving region of the first hook-shaped end of the first support element. Thereby, the first cam and the first support member can function as a locking unit for locking the first support member in the first position.In the second position, a second portion of the first cam may be received in a first recess of the first main body of the first support member. Thereby, the first cam and the first support member can function as a locking unit for locking the first support member in the second position.Advantageously, the first main body can have a first guide part, wherein the tool lower part is slidable or rollable in the first guide part and / or on the first guide part. The lower tool part can have rollers arranged laterally on the lower tool part. The rollers allow the lower tool part to slide / roll on the first guide part. The guide part can be designed in the form of a rail, preferably in the form of a running rail.The first guide part and the first cam may be spaced apart from each other in the transport direction. As a result, the first cam can be arranged such that it does not block the lower tool part in the changing direction when the lower tool part is in the changing position.The changing device can expediently have two support elements or the first support element and a second support element. The support elements can each be configured identically. The support elements can be arranged symmetrically to one another on opposite sides of the lower tool part. By transferring the support elements from their first position into their second position, the lower tool part can be moved or tilted from the operating position to the changing position. The lower tool part can be slidable and / or rollable on both support elements.The changing device can expediently have two cams. The cams can each be configured identically. The cams can be arranged symmetrically to one another on opposite sides of the lower tool part. By transferring the cams from their first latching position into their second latching position, the support elements can be moved or tilted from their first position to their second position. The changer may include a plurality of pairs of cams distributed along a length of the sidewall.The two cams can be coupled together via a shaft, preferably by means of a lever, in such a way that they can be actuated together. By rotating the shaft by means of the lever, both cams can be moved from their first latching position into their second latching position.In one embodiment, a protrusion may be disposed on the shaft. The projection can be accommodated in a recess of the lower tool part in order to push the lower tool part transversely to the alternating direction, preferably in the transport direction or in the direction of the shaft axis, when the shaft is rotated. By displacing in the direction of the shaft axis, the lower tool part can be moved towards or away from a chamber part arranged next to the lower tool part, preferably from a seal arranged laterally next to the lower tool part. The chamber part may comprise a preheating plate. The chamber part may be a preheating plate. In the operating position, the lower tool part can form at least part of a wall of an airtight chamber in which a heating device is arranged. The seal may seal a gap between the tool bottom and the chamber portion when the tool bottom is in the operating position. The movement of the lower tool part between a first provision position and a second provision position can displace the lower tool part transversely with respect to the alternating direction or in the direction of the shaft axis.The seal can be arranged next to the lower tool part in the direction of the shaft axis. As a result, the lower tool part can be removed from the work station more easily without any or at least without excessive friction with the seal arranged next to the lower tool part. The recess can be formed between opposite sides of the lower tool part, preferably centrally in the lower tool part. The recess can be designed in the form of a slotted guide track. The protrusion may be formed in the shape of a pin.In one embodiment, the tool lower part can have a recess for receiving a blocking unit of a frame element, such that a movement of the tool lower part along the support element and / or the frame element is prevented when the tool lower part is in the operating position. The blocking unit can be designed in the form of a cone. As a result, the lower tool part can be secured in the operating position without an additional locking. When the tool lower part is tilted from the operating position into the changing position, the tool lower part can be held away from the blocking unit. The recess can be formed between opposite sides of the lower tool part, preferably centrally in the lower tool part.The invention further relates to a thermoform packaging machine comprising the workstation according to one of the above-described embodiments. The thermoform packaging machine can have a forming station, a sealing station or an evacuating and sealing station, and optionally a cutter device, which are arranged in this order on a machine frame in a production direction. The workstation can be the forming station and / or the sealing station. The work station can have a lifting device for moving the lower tool part relative to the upper tool part. In the thermoform packaging machine, a film web can be introduced into the machine from an inlet side. In the forming station, containers can be formed from or in the film web. After products have been filled in a filling station, the containers can be sealed with an upper film in the sealing station and finally separated from one another by means of the cutting device. The lower die part or lower die part can be provided below the film web. The mold base may be movable between a raised position and a lowered position. In its raised position, the mold base may act on the film web to deform the film web downward to form a product cavity in the product carriers or troughs. The mold base in its lowered position can be moved away from the film web to allow for forward movement of the film web with the product cavity formed therein. In its raised position, the upper ends of the side walls of the mold bottom can come into contact with the underside of the film web. Negative air pressure can be generated inside the mold base by a vacuum line and a series of air channels formed in the bottom of the mold base. As a result, the film web can be deformed downward into the interior of the lower tool part. The sealing station may comprise a sealable chamber in which the atmosphere in the wells may be replaced prior to sealing, for example by evacuation or gas flushing with an exchange gas or with a gas mixture. The lifting device can move format-dependent sealing glasses with a base plate up and down. The sealing station can have at the top a sealing tool upper part in which a sealing plate is arranged. A group of troughs which are formed in the film web during a working cycle in the forming station and then intermittently transported in the production direction can be defined as a format. A format can have a plurality of packages or troughs both in the production direction of the thermoform packaging machine or film running direction and transversely thereto, for example 4 x 4 troughs. In the case of a format change from 4 x 4 to 3 x 3 troughs, for example, both parts of the forming station or lower mold part and parts of the sealing station or lower seal mold part (the sealing glasses or a sealing plate) can be changed.The following figures show: FIG. 1 is a schematic side view of a thermoform packaging machine, FIG. 2 shows a schematic side view of a work station of the thermoform packaging machine, FIG. 3 is a schematic side view of the work station, FIG. 4 shows a schematic side view of an embodiment of the workstation of the thermoform packaging machine with a changeover device, FIG. 5 shows a schematic side view of the work station of the thermoform packaging machine with the changing device, FIG. 6 shows a schematic side view of the work station showing a first and second position of a supporting element of the changing device, FIG. 7 is a schematic side view of the work station showing a cam of the changing device in different positions during a rotational movement, FIG. 8 is a schematic side view of an embodiment of the work station, FIG. 9 is a schematic top view of an embodiment of the work station, FIG. 10 is a schematic side view of an embodiment of the work station, FIG. 11 shows a schematic top view of the embodiment of the workstation shown in FIG. 10 in a first working position, FIG. 12 shows a schematic plan view of the embodiment of the workstation shown in FIG. 10 in a second working position, FIG. 13 is a schematic side view of an embodiment of the work station.Identical components are provided with identical or corresponding reference numerals throughout the figures.FIG. 1 shows a thermoform packaging machine 1. thermoform packaging machine 1 has a forming station 2, a sealing station 3, a cross-cutting device 4 and a longitudinal cutting device 5, which are arranged in this order on a machine frame 6 in a production direction R. Between the forming station 2 and the sealing station 3 an insertion station 7 is provided. In the insertion station 7, food products are inserted, for example, into product carriers 8 formed by the forming station 2.On the input side, a feed roller 9 is located on the machine frame 6, from which a film web 10 is drawn off. In the region of the sealing station 3, a material storage unit 11 is provided from which a cover film 12 is removed. On the output side, a conveying device 13 is provided on the thermoform packaging machine 1, with which finished packages 14 with individual product carriers 8 are transported away. Furthermore, the thermoform packaging machine 1 has a feed device 15 which grasps the film web 10 and transports it further in the production direction R per main operating cycle. The feed device 15 can be embodied, for example, by clamp chains 16 arranged on both sides. A user interface 17 in the form of a display device is arranged on the thermoform packaging machine 2. The user interface 17 has operating elements 18.FIG. 2 shows a schematic view of a work station 19 of the thermoform packaging machine 1. the work station 19 can be the forming station 2 or the sealing station 3. The work station 19 has a base part 20. The work station 19 has a tool upper part 21 connected to the base part 20. The work station 19 has a lower tool part 22 which can be moved relative to the upper tool part 21. The base part 20 and the tool upper part 21 are connected to one another via rods 23 or tie rods or guide rods. A lifting device 24 is provided for moving the lower tool part 22 and a frame element 25 carrying the lower tool part 22 (the frame element 25 can be a plate) relative to the upper tool part 21. Below the lower tool part 22, a seal 26 is provided.FIG. 3 shows a schematic view of the lower tool part 22 of the workstation 19 of the thermoform packaging machine 1. the lower tool part 22 for forming film web 10 in product carriers 8 or for sealing the film web 10 with the lid film must be changed for a format change of the packages 14. For the format change, the lower tool part 22 must be removed from the work station. In order to prevent friction between the tool lower part 22 and the seal 26, the tool lower part 22 must be lifted from the seal 26 with a tilting movement 27 in a changing direction 28. The lower tool part 22 can then be removable from the work station 19 in the changing direction 28.FIG. 4 shows a schematic view of an embodiment of the workstation 19 with a changing device 29. FIG. 4 shows a first side of the workstation or a first side S 1 of the lower tool part 22.The change device 29 can serve to lift the lower tool part 22 from the seal 26 for simple removal thereof from the work station 19. The changing device 29 can also serve for locking the changing device 29 in an operating position 30. In the position shown in FIG. 4, the lower tool part 22 is in the operating position 30.The switching device 29 includes a first support member 31. the first support member 31 has a first main body 31 aand a first hook-shaped end 31 bextending from the first main body 31 aof the first support member 31. The first support element 31 is rotatably mounted on the work station 19 about a first tilting axis 32. The changing device 29 has a first cam 33. The changing device 29 is configured to tilt the first support element 31 about the first tilting axis 32 by rotating the first cam 33 about a first rotation axis 34 arranged separately from the first tilting axis 32.FIG. 5 shows a schematic view of another side of the work station 19 with the changing device 29. FIG. 5 shows a second side S 2 of the tool lower part 22.The switching device 29 includes a second support member 35. the second support member 35 has a second main body 35 aand a second hook-shaped end 35 bextending from the second main body 35 aof the second support member 35. The first and the second support elements 31, 35 are each of the same design. The first and the second support elements 31, 35 are arranged symmetrically to one another on opposite sides S 1, S 2 of the lower tool part 22. The lower tool part 22 is mounted on the first support element 31 and on the second support element 35 of the changing device 29.The second support element 35 is rotatably mounted on the work station 19 about a second tilting axis 36. The changing device 29 has a second cam 37. The changing device 29 is configured to tilt the second support element 35 about the second tilting axis 36 by rotating the second cam 37 about a second rotation axis 38 arranged separately from the second tilting axis 36. The first and second cams 33, 37 are each of the same design. The first and second cams 33, 37 are arranged symmetrically to one another on opposite sides S 1, S 2 of the lower tool part 22.FIG. 6 shows a schematic view of the work station 19 and the tool lower part 22 from the first side S 1, in which the work station 19 is shown in a first position 39 of the first support element 31 (illustration on the left side) and in a second position 40 of the first support element 31 (illustration on the right side). The same configuration and functional principle, which are illustrated in FIG. 6, also apply to a first and second position of the second supporting element 35.The tool lower part 22 is in the operating position 30 when the first support element 31 is in the first position 39. In the first position 39, a first portion 33 aof the first cam 33 is accommodated in an accommodation region 31 cof the first hook-shaped end 31 bof the first support element 31. When the first support member 31 is in the first position 39, the first support member 31 is locked by the first cam 33. As a result, the lower tool part 22 is locked in the operating position 30. By a rotational movement of the first cam 33 from a first latching position 41 into a second latching position 42, the first support element 31 is tilted from the first position 39 into the second position 40. In the second position 40, a second portion 33 bof the first cam 33 is accommodated in a first depression 31 dof the first main body 31 aof the first support element 31. As a result, the first support element 31 is locked, and the first support element 31 and the tool lower part 22 are tilted from the operating position 30 into a changing position 43.FIG. 7 shows a schematic view of the work station 19 with the first cam 33 of the changing device 29 in different positions during a rotational movement from the first latching position 41 into the second latching position 42.For example, in the first position 39, a first portion 33 aof the first cam 33 is accommodated in an accommodation region 31 cof the first hook-shaped end 31 bof the first support element 31. By a rotational movement of the first cam 33 and the second cam 37, the respective lockings between the support elements 31, 35 and the cams 33, 37 are released. When a dead point is exceeded, the cams 33, 37 are fixed in their respective second latching positions. In the second position 40, a second portion 33 bof the first cam 33 is accommodated in a first depression 31 dof the first main body 31 aof the first support element 31.FIG. 8 shows a schematic view of an embodiment of the work station 19 where the first support element 31 of the changing device 29 is provided with a guide part 31 e. The same configuration and functional principle that are illustrated in FIG. 8 also apply to the second support element 35.In order to slide or roll the tool lower part 22 on the first support member 31, the first main body 31 aincludes the first guide part 31 ein the form of a running rail. In / on the guide part 31e, the tool lower part 22 can be rolled by its rollers 44. As a result, the lower tool part 22 can be easily removed from the work station 19.Fig. 9 shows a schematic top view of an embodiment of the work station 19, in which embodiment the two cams 33, 37, respectively the first cam 33 and the second cam 37, are coupled to each other via a shaft 45. The shaft 45 is arranged on the frame element 25. The first cam 33 and the second cam 37 are actuatable together by means of a lever 46. By a rotational movement of the lever 46, the first cam 33 and the second cam 37 are rotated by the shaft 45 and thereby the first support member 31 and the second support member 35 are respectively brought from their first position to the second position and tilted upward. The lower tool part 22 is thus brought from the operating position 30 into the changing position 43.Fig. 10 shows a schematic side view of an embodiment of the work station 19. In Figs. 10-12 the first support element 31 is not shown.In this embodiment, a projection 55 is disposed on the shaft 45. The projection 55 is accommodated in a recess 47 of the lower tool part 22 in the form of a slotted guide. The projection 55 and the recess 47 are arranged such that the lower tool part 22 is displaceable in the direction of the shaft axis 56 or transversely to the alternating direction 28 when the shaft 45 is rotated.FIG. 11 shows a schematic plan view of the embodiment of the workstation 19 shown in FIG. 10 in a first provision position 48. in the first provision position 48, the tool lower part 22 is arranged along the production direction R next to a chamber part 49 of the workstation 19 or downstream of the chamber part 49. The chamber part 49 can have a preheating plate for heating the film web 10. In the first provision position 48, the lower tool part 22 can be in the operating position. Seals 26' are provided between the pre-heating plate 49 and the lower die portion 22. The projection 55 is received in a narrow region 50 of the recess 47. By a rotational movement of the shaft 45, the lower tool part 22 is displaced in the direction of the shaft axis or in the production direction R.FIG. 12 shows a schematic plan view of the embodiment of the workstation 19 shown in FIG. 10 in a second provision position 51. In the second provision position 51, the tool lower part 22 is arranged offset along the production direction R with respect to the preheating plate 49. The projection 55 is received in a wide area 52 of the recess 47. In the second provision position 51, the lower tool part 22 can be located in the change position 43.FIG. 13 shows a schematic side view of an embodiment of the work station 19. The recess 53 receives a blocking unit 54 of the frame element 25, in particular when the lower tool part 22 is in the operating position 30. This prevents a movement of the lower tool part 22 relative to the first and / or second support element 31, 35 when the lower tool part 22 is in the operating position 30. This also prevents a movement of the lower tool part 22 relative to the frame element 25 when the lower tool part 22 is in the operating position 30.

Claims

Workstation (19) for a thermoform packaging machine (1) comprising an upper tool part (21), a lower tool part (22) which can be removed from the workstation (19) in a changing direction (28), a changing device (29) for tilting the lower tool part (22) from an operating position (30) to a changing position (28), characterized in that the lower tool part (22) is mounted on a first support element (31) of the changing device (29), wherein the first support element (31) is mounted on the workstation (19) such that it can rotate about a first tilting axis (32), wherein the changing device (29) has a first cam (33), and wherein the changing device (29) is configured to tilt the first support element (31) about the first tilting axis (32) by rotating the first cam (33) about a first rotation axis (34) which is arranged separately from the first tilting axis (32).Workstation according to claim 1, characterised in that by a rotational movement of the first cam (33) from a first locking position (41) to a second locking position (42), the first support element (31) can be tilted from a first position (39) to a second position (40).Workstation according to claim 2, characterised in that the first support element (31) can be brought from the first position (39) to the second position (40) only with a tilting movement.Workstation according to claim 2 or 3, characterised in that the first tilting axis (32) is stationary at the workstation (19), preferably during the entire rotational movement of the first cam (33) between the first locking position (41) and the second locking position (42).Workstation according to one of claims 2 to 4, characterised in that the first support element (31) can be locked in cooperation with the first cam (33) in the first position (39) when the first cam (33) is in the first locking position (41), and / or wherein the first support element (31) can be locked in cooperation with the first cam (33) in the second position (40) when the first cam (33) is in the second locking position (42).A work station according to any one of the preceding claims, characterized in that the first support element (31) comprises a first main body (31a) and a first hook-shaped end (31b) extending from the first main body (31a) of the first support element (31).Workstation according to claim 6, characterised in that in the first position (39) a first section (33a) of the first cam (33) is accommodated in a first accommodation area (31a) of the first hook-shaped end (31b) of the first support element (31).Workstation according to claim 6 or 7, characterised in that in the second position (40) a second section (33b) of the first cam (33) is accommodated in a first recess (31d) of the first main body (31a) of the first support element (31).Workstation according to one of claims 6 to 8, characterised in that the first main body (31a) has a first guide part (31e), wherein the tool lower part (22) is slidable or rollable in the first guide part (31e) and / or on the first guide part (31e).Workstation according to one of the preceding claims, characterized in that the changing device (29) has two support elements (31, 35), wherein the support elements (31, 35) are each of the same design and are arranged symmetrically to one another on opposite sides (S1, S2) of the lower tool part (22).Workstation according to one of the preceding claims, characterized in that the changing device (29) has two cams (33, 37), wherein the cams (33, 37) are each of the same design and are arranged symmetrically to one another on opposite sides (S1, S2) of the lower tool part (22).Workstation according to claim 11, characterised in that the two cams (33, 37) are coupled to one another via a shaft (45), preferably actuatable jointly by means of a lever (46).Workstation according to claim 12, characterised in that a projection (55) is arranged on the shaft, wherein the projection (55) is accommodated in a recess (47) of the lower tool part (22) in order to push the lower tool part (22) transversely to the alternating direction (28), preferably in the direction of a shaft axis (56), when the shaft (45) rotates.Workstation according to one of the preceding claims, characterized in that the lower tool part (22) has a cutout (53) for receiving a blocking unit (54) of a frame element (25), such that a movement of the lower tool part (22) along the first supporting element (31) and / or the frame element (25) is prevented when the lower tool part (22) is in the operating position (30).Thermoform packaging machine (1) comprising a workstation (19) according to one of claims 1 to 14.

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