EP3613676B1 - Packaging machine with a cutting device with optimised energy consumption - Google Patents

Description

The invention relates to a packaging machine for packaging goods to be packaged by means of a stretchable film. The packaging machine comprises a film transport device for feeding film to a packaged item to be packaged and a knife device. In this case, the knife device can be transferred from a rest position into an extended position by a drive with a driving force. The knife device has a return mechanism that is spatially separated from the drive, the return mechanism being activated when the knife device is transferred from the rest position to the extended position, and the return mechanism in the activated state exerts a return force on the knife device in the extended position in the direction of the rest position can be exercised, which is greater than the return resistance of the knife device in the extended state, by means of which the knife device is held in the extended state without the action of the driving force.

From the EP 3 093 244 B1 Such a packaging machine for packaging goods to be packaged by means of foils is known, in which the foil is cut to size with a foil cutting device or knife device.

The US-A 5 014 489 discloses a food tray packaging machine. The packaging machine comprises a film roll for a film, a motor for driving the transport of the film and a motor controller for controlling the motor. The motor control starts the transport of the film to a packaging station when a sensor signals the presence of a food tray. On the slide there are spaced markings in the longitudinal direction of the film. The motor control stops the film when it receives a signal from a marking sensor that registers a mark on the film. A perforating knife perforates the film along a line across the width of the film, but without cutting through the film. The food tray is moved from below against the film. Folding arms fold the film around the food tray and separate a sheet of film from the rest of the film along the perforated line. Then the wrapped food tray is transported away.

A stretch film packaging machine with high performance can pack more than 35 packaging goods, in particular large tray trays, per minute. Very powerful machines can achieve more than 40, depending on the pack size, even up to 50 packs per minute with small tray trays.

• Das Verpackungsgut wird aufgenommen und gewogen.
• Durch die Folienzuführung wird Folie aus einem Folienvorrat einer Folientransportvorrichtung, insbesondere in Form von Transportriemen, zugeführt und anschließend zum Verpacken eines Verpackungsgutes verwendet. Die Folie wird durch die Messereinrichtung zugeschnitten. Zum Zuschneiden der Folie wird das Messer der Messereinrichtung durch den Antrieb aus der Ruhestellung in die ausgefahrene Stellung überführt.

In order to pack a packaged item, the following steps must be carried out in particular:

• The packaged goods are picked up and weighed.
• By means of the film feed, film is fed from a film supply to a film transport device, in particular in the form of transport belts, and is then used to pack a packaged item. The film is cut to size by the knife device. To cut the film, the knife of the knife device is moved from the rest position to the extended position by the drive.

• Das Verpackungsgut wird über einen Hubtisch angehoben und unter der Folie hochgedrückt.
• Die Folie wird mit den seitlichen Schiebern gleichzeitig links und rechts unter das Verpackungsgut geschoben. Ferner wird die Folie mit dem rückwärtigen Schieber von hinten unter das Verpackungsgut geschoben.
• Das Verpackungsgut wird etikettiert und auf das Siegelband geschoben, wobei der vordere Folienteil unter die Packung geschoben wird.
• Die Folie wird unter der Tray-Schale versiegelt und das Verpackungsgut wird ausgegeben.

In particular, the film comes from an "endless roll" and is unwound. Once the required film length for a packaging process has been reached, this film part must be separated from the continuous film become. The knife is used to cut the film from the endless roll. The cutting off of a stretch film in particular is made more difficult by the fact that a stretch film is typically comparatively thin and, due to its stretch properties, easily just wraps around the knife without being severed.

• The packaged goods are lifted using a lifting table and pushed up under the film.
• The film is pushed under the packaged goods on the left and right at the same time using the side slides. Furthermore, the slide is pushed from behind under the packaged goods with the rear slide.
• The packaged goods are labeled and pushed onto the sealing tape, with the front part of the film being pushed under the pack.
• The film is sealed under the tray shell and the packaged goods are dispensed.

Typically, while the film is being cut to size, a knife of the knife device slides across the film, making a cut in the film, which leads to a relatively slow cutting process. For a quick cutting process, the cutter device is moved towards the film by the drive before the cutting process, cuts through the film over its entire width, and is moved away from the film after the cutting process.

The use of the drive for moving the knife device in both directions towards the film and away from the film requires a fast switching of the drive and an associated expensive drive and high energy consumption.

In contrast, the object of the present invention is to modify a packaging machine of the type defined at the outset and a packaging method in such a way that the knife device is retrieved without the action of the drive, preferably automatically.

This object is achieved with regard to the device in a technically particularly simple and surprisingly effective way by a generic packaging machine of the type defined at the outset, which is characterized in that the knife device has a knife for cutting film from the film feed and the film through the knife device in the in the extended position that the knife device is connected via the return mechanism to a housing surrounding the knife device, that the knife device has a knife guide, the return mechanism having a second elastic element, which has one end on the knife guide and the other end on the Knife is attached, and that the knife, under tension of the second elastic element, can be transferred from a first knife position within the knife guide into a second knife position in which the knife protrudes over the knife guide and below Relaxation of the second elastic element from the second knife position can be transferred back into the first knife position.

Knives, inter alia, are known from the prior art which press on the film with a cutting edge the width of the entire film. In order to cut through the film, the knife is applied to the film over its entire width with an electric motor or a lifting magnet pressed. After the cutting process, the knife is withdrawn using the electric motor or the lifting magnet. The return of the knife is done, if necessary, by means of a spring. A tension spring is used in particular for the spring support. A tension spring can be tensioned and relieved three to five times a minute. The return of the knife with the force of a tension spring alone is not possible. In addition, the eyelets of a tension spring are often prone to breakage. The drive of the knife, in particular in the form of the electric motor or lifting magnet, always acts in both directions, both when moving the knife towards the film and when moving the knife away from the film.

In contrast to this, the return mechanism according to the invention is used to return from the extended position to the rest position against the return resistance of the knife device, the return mechanism not requiring the drive. The return resistance includes all forces without the force of the drive that act on the knife device in the extended state and counteract a return of the knife device. In particular, these forces include frictional and inertial forces. The drive can be designed mechanically, electrically or magnetically. The return mechanism enables the drive to only act in the cutting direction of the knife, the knife guide being transferred from the rest position to the extended position in the cutting direction. The drive is then preferably decoupled or switched off. The return mechanism then brings about an automatic return of the knife device from the extended position to the rest position counter to the cutting direction.

A second elastic element, which connects the knife guide and the knife, the movement of the knife guide with that of the Knife are coupled so that when the knife moves, the knife guide is automatically moved at least a little. The use of an elastic element enables different geometric settings of the knife and the knife guide relative to one another.

The knife preferably cuts through the film completely on the transition from the first to the second knife position. The movement of the knife in the cutting direction is preferably controlled by the drive, the knife guide being held back by a stop. As a result of the tension of the second elastic element, in particular a leaf spring, a spring force that is opposite to the cutting direction builds up. After switching off the drive, this spring force pulls the knife back into the first knife position. By relaxing the first elastic element, in particular the knife can then be returned to the rest position of the knife guide with a driver that takes the knife guide with it.

An advantageous embodiment of the packaging machine according to the invention is characterized in that the return mechanism has a first elastic element which is in particular fastened indirectly to the knife of the knife device. The first elastic element fastened to the knife can be brought into a tense form by the movement of the knife device from the rest position into the extended position. This builds up the force that is required to return the knife device to the rest position. The return then takes place automatically with the relaxation of the elastic element.

A preferred further development of this embodiment is characterized in that the first elastic element is designed as a compression spring and is preferably connected to the knife device by means of a rod. Compared to other springs, such as tension springs, compression springs are characterized by their high load capacity. They can be used with rapid repetition and with strong spring forces to return the knife guide to the rest position. The rod is preferably passed through the compression spring. A compression spring can be tensioned and relieved up to a hundred times a minute.

In a class of further advantageous embodiments of the invention, the knife guide comprises one or more guide plates, preferably in the form of two guide plates lying opposite one another. The control of the movement of the knife is considerably improved by a knife guide.

Further advantageous embodiments of the packaging machine according to the invention are characterized in that the film feed has a film guide element with a cutting gap which is spaced from the knife device in the rest position by a film feed gap, the knife device, in particular the knife guide, resting against the film guide element in the extended position. The film preferably rests against the film guide element and is pressed against the film guide element by the knife device, in particular the knife guide. This causes a deformation of the Foil, in particular an elastic film, prevented. This enables the film to be cut precisely.

A further development of these embodiments is characterized in that the knife protrudes through the cutting gap of the film guide element in the extended position of the knife device, in particular the knife guide. In particular, the knife, preferably by the drive, can be transferred from the first knife position to the second knife position in the extended position of the knife guide, with it reaching through the cutting gap while the knife guide strikes the foil guide element. When the knife is transferred from the first knife position to the second knife position, the knife cuts through the film. After the film has been cut through, the knife can automatically be returned to the first knife position by the second elastic element, in particular by switching off the drive.

In a further embodiment of the packaging machine according to the invention, it has further elastic elements, in particular in the form of at least one further compression spring and / or at least one further leaf spring. As a result, the return forces can be increased and a failure of an elastic element can be compensated for.

A preferred embodiment of the packaging machine is characterized in that the knife guide has at least one slide guide, in particular two slide guides, for at least one slide block formed on the knife, in particular two slide blocks. The sliding blocks are preferably on the Housing that surrounds the knife device and thus serve to center the knife.

A further development of this embodiment is characterized in that at least one, in particular circular, spacer is arranged on the knife guide between the knife guide and the housing surrounding the knife device, which during the transfer of the knife device from the rest position to the extended position along the housing of the knife device can be performed, wherein in particular two spacers are arranged opposite one another on the knife guide. These spacers cause the knife guide to be centered.

A particularly preferred variant of this class of configurations is characterized in that the sliding block is arranged on the housing, reaches through the spacer and engages in the slide guide of the knife guide, with a slide block in particular reaching through two opposing spacers, which is inserted into a slide guide of the The knife guide engages. Then the sliding block or the sliding blocks limit the displacement of the knife guide in the cutting direction.

Another embodiment is characterized in that the film guide element has contact surfaces on the cutting gap, in particular rubber lips, for the film to be attached. Due to the elastic counterforce of the rubber lips, the film can be clamped particularly well between the rubber lips and the knife guide, which presses against the rubber lips in the extended position of the knife guide.

In a further advantageous embodiment of the packaging machine according to the invention, the drive has a pressure magnet which preferably only acts in the cutting direction of the knife device. The pressure magnet is designed in particular as a lifting magnet, linear magnet and / or electromagnet. In particular, the pressure magnet causes a linear movement. The force of the pressure magnet only acts in the cutting direction, from the idle state of the knife device to the extended state. It can be switched off after the knife guide and knife have been extended, the return mechanism causing the knife and knife guide to automatically return to the rest position.

Finally, another preferred embodiment is characterized in that the drive and / or the return mechanism - in particular U-shaped - has coupling elements for connection to the knife, which are preferably insertable into recesses in the knife guide. The U-shaped coupling elements grip around the knife and can then be fastened to the knife in a simple manner with bolts guided through the knife. The coupling elements are formed on rods of the pressure magnet, of the first elastic element and / or on the second elastic element, in order to establish a mechanical connection with the knife in each case.

Further features and advantages of the invention emerge from the following detailed description of an exemplary embodiment of the invention with reference to the figures of the drawing, which shows details essential to the invention, and from the claims. The individual features can each be implemented individually or collectively in any combination in the case of variants of the invention.

Fig. 1

einen Längsschnitt durch eine Folienübergabe einer Verpackungsmaschine;

Fig. 2

einen Längsschnitt durch das Folienführungselement und die Messereinrichtung mit einem erfindungsgemäßen Rückholmechanismus in der Ruhestellung und dem Messer in der ersten Messerstellung;

Fig. 3

einen Längsschnitt durch das Folienführungselement und die Messereinrichtung, wobei sich die Messereinrichtung in der ausgefahrenen Stellung und das Messer in der ersten Messerstellung befindet;

Fig. 4

einen Längsschnitt durch das Folienführungselement und die Messereinrichtung, wobei sich die Messereinrichtung in der ausgefahrenen Stellung und das Messer in der zweiten Messerstellung befindet;

Fig. 5

eine Draufsicht auf den Druckmagneten, das Folienführungselement und die Messereinrichtung in der Ruhestellung und mit dem Messer in der ersten Messerstellung;

Fig. 6

zeigt eine Draufsicht auf den Druckmagneten, das Folienführungselement und die Messereinrichtung in der ausgefahrenen Stellung und mit dem Messer in der ersten Messerstellung; und

Fig. 7

eine Draufsicht auf den Druckmagneten, das Folienführungselement und die Messereinrichtung in der ausgefahrenen Stellung, wobei sich das Messer in der zweiten Messerstellung befindet.

In the schematic drawing, an embodiment of the invention is shown, which is explained in more detail in the following description. Show it:

Fig. 1

a longitudinal section through a film transfer of a packaging machine;

Fig. 2

a longitudinal section through the film guide element and the knife device with a return mechanism according to the invention in the rest position and the knife in the first knife position;

Fig. 3

a longitudinal section through the film guide element and the knife device, the knife device being in the extended position and the knife in the first knife position;

Fig. 4

a longitudinal section through the film guide element and the knife device, the knife device being in the extended position and the knife in the second knife position;

Fig. 5

a plan view of the pressure magnet, the film guide element and the knife device in the rest position and with the knife in the first knife position;

Fig. 6

shows a plan view of the pressure magnet, the film guide element and the knife device in the extended position and with the knife in the first knife position; and

Fig. 7

a plan view of the pressure magnet, the film guide element and the knife device in the extended position, the knife being in the second knife position.

Fig. 1 shows a longitudinal section through a film transfer as part of a packaging machine 10 . The packaging machine 10 comprises a film feed 11 , through which film is fed from a film supply (not specifically shown in the drawing) to a film transport device 12. The film transport device 12 transports the film to the location of the packaging of a packaged item (not shown). A knife device 13 according to the invention for cutting the film to size is located between the film feed 11 and the film transport device 12.

The knife device 13 has a knife guide 14 in the form of two opposing guide plates 14a , 14b . A knife 15 is located between the guide plates 14a, 14b. The knife 15 and the knife guide 14 are elastically connected to one another (see Fig. 5 ). Circular spacers 16a , 16b are attached to the guide plates 14a, 14b to maintain the distance between the guide plates and a housing 17 of the knife device 13 which surrounds the knife device 13. The knife 15, the guide plates 14a, 14b and the circular spacers 16a, 16b form a sandwich-like structure.

Opposite the knife device 13 is a film guide element 19 with contact surfaces 20a , 20b (see FIG Fig. 2 ) in the form of rubber lips for attaching the film. A film feed gap 22 for guiding the film through is formed between the knife device 13 and the film guide element 19. The guide plates 14a, 14b are pressed against the contact surfaces 20a, 20b when the film is cut (see FIG Fig. 3 ). The contact surfaces 20a, 20b are arranged around a cutting gap 23 through which the knife 15 can reach to cut the film (cf. Fig. 4 ).

A drive 9 in the form of a pressure magnet 25 moves the knife device 13 via a pressure magnet rod 26 only in one cutting direction 27 towards the film guide element 19. On the pressure magnet rod 26 there is a stop 28 of the pressure magnet rod 26 which rests against the housing 17 of the knife device 13 or against a housing of the pressure magnet 25. The pressure magnet 25 is designed in particular as a lifting magnet, linear magnet or electromagnet which only acts in the cutting direction 27. The movement of the knife guide 14 in the direction 30 opposite the cutting direction 27 is carried out by a return mechanism according to the invention (see FIG Fig. 2 ).

Fig. 2 shows a longitudinal section through the film guide element 19 and the knife device 13 with a return mechanism 31a according to the invention. The return mechanism 31a is arranged along the guide plates 14a, 14b offset from the pressure magnet 25 (see FIG. Fig. 5 ). The knife device 13 has the knife guide 14 in the form of the guide plates 14a, 14b and the knife 15 arranged between the guide plates 14a, 14b. The return mechanism 31a includes a first elastic member 32a in the form of a compression spring 33a around a rod 34a of the return mechanism 31a, on which a stop 35a for the compression spring 33a is arranged. The compression spring 33a and the rod 35a are arranged in the housing 17 of the knife device 13. The housing 17 can be formed in one piece or in several pieces. The rod 34a has at one end 37a a U-shaped coupling element 38a which is firmly connected to the knife 15 via a bolt 39a passed through the knife 15.

The knife device 13 is in a rest position 40 . The film feed gap 22 is formed between the knife device 13 and the film guide element 19 with the contact surfaces 20a, 20b. With one by the pressure magnet 25 (see Fig. 1 ) caused movement of the knife device 13 in the cutting direction 27 towards the film guide element 19, the compression spring 33a is pressed against the housing 17 and compressed. It then acts on the stop 35a with a force which is opposite to the cutting direction 27. After the pressure magnet 25 has been switched off, the pressure spring 33a relaxes, as a result of which the knife device 13 is returned to the rest position 40.

Fig. 3 shows a longitudinal section through the film guide element 19 and the knife device 13, the knife device 13 being in an extended position 41 . The two guide plates 14a, 14b are in contact with the contact surfaces 20a, 20b of the film guide element 19, bridging the film feed gap 22. The rod 34a of the return mechanism 31a is partially extended and a distance 42 in the cutting direction 27 is formed between the housing 17 of the knife device 13 and the U-shaped coupling element 38a. The knife 15 is in a first knife position 43 arranged within the knife guide 14 between the two guide plates 14a, 14b.

Fig. 4 shows a longitudinal section through the film guide element 19 and the knife device 13, the knife 15 being in a second knife position 44 . The knife guide 14 in the form of the two guide plates 14a, 14b rests on the contact surfaces 20a, 20b of the film guide element 19. The knife 15 between the two guide plates 14a, 14b of the knife guide 14 reaches through the cutting gap 23 of the film guide element 19 in the second knife position 44 Fig. 3 ) into the second knife position 44 by the drive of the pressure magnet 25 (see Fig. 1 ) the knife 15 cuts through the film attached to the film guide element 19.

Fig. 5 shows a plan view of the pressure magnet 25, the film guide element 19 and the knife device 13 in the rest position 40 (see Fig. 2 ). In particular, the knife 15, the contact surface 20b of the film guide element 19 and the film feed gap 22 are shown. A return mechanism 31a, 31b, each with a first elastic element 32a, 32b in the form of a compression spring 33a, is located along the knife 15 on both sides of the pressure magnet 25. 33b arranged. Each return mechanism 31a, 31b and the pressure magnet 25 is connected via a coupling element 38a, 38b, 38c on the respective rod 26, 34a, 34b (see Fig. 6 ) and a bolt 39a, 39b, 39c firmly connected to the knife 15. The knife 15 is connected to the knife guide 14 by second elastic elements 45a , 45b in the form of leaf springs 46a , 46b . The leaf springs 46a, 46b are attached to the knife 15 via coupling elements 38d , 38e of the leaf springs 46a, 46b. The coupling elements 38a-38e can When the knife 15 is moved in the cutting direction 27, insert it into recesses 47a , 47b , 47c, 47d , 47e of the knife guide 14. Sliding blocks 48a , 48b are attached to the knife 15 and are moved in slotted guides 49a , 49b of the knife guide 14 and are guided along the housing 17 which surrounds the knife device 13. As a result, the sliding blocks 48a, 48b ensure that the knife 15 is centered. They also support the return movement of the knife guide 14 after the pressure magnet 25 has been switched off.

Fig. 6 shows a plan view of the pressure magnet 25, the film guide element 19 and the knife device 13 in the extended position 41 (see Fig. 3 ). The knife 15 reaches through the film feed gap 22 (see Fig. 5 ). The rods 26, 34a, 34b of the return mechanisms 31a, 31b and the pressure magnet 25 are partially extended. The coupling elements 38a - 38e of the return mechanisms 31a, 31b and the stop 28 of the pressure magnet 25 are each at a distance from the housing 17 of the knife device 13 in the cutting direction 27.

Fig. 7 shows a plan view of the pressure magnet 25, the film guide element 19 and the knife device 13 in the extended position 41 (see Fig. 3 ), the knife 15 in the second knife position 44 (see Fig. 4 ) is located. The coupling elements 38a - 38e associated with the return mechanisms 31a, 31b, the pressure magnet 25 and the leaf springs 46a, 46b have moved into the respective recesses 47a - 47e of the knife guide 14.

List of reference symbols

9

drive

10

Packing machine

11

Foil feed

12th

Foil transport device

13th

Knife device

14th

Knife guide

14a, b

Guide plates

15th

knife

16a, b

Spacers

17th

casing

19th

Foil guide element

20a, b

Contact surfaces

22nd

Foil feed gap

23

Cutting gap

25th

Pressure magnet

26th

Push magnet rod

27

Cutting direction

28

Stop of the pressure magnet

30th

opposite direction to the cutting direction

31a, b

Return mechanism

32a, b

first elastic element

33a, b

Compression spring

34a, b

Return mechanism rod

35a

Stop for the compression spring

37

End of the return mechanism rod

38a-e

Coupling elements

39a, b, c

bolt

40

Rest position

41

extended position

42

distance

43

first knife position

44

second knife position

45a, b

second elastic elements

46a, b

Leaf springs

47a-e

Recesses in the knife guide

48a, b

Sliding blocks

49a, b

Scenery tours

Claims (14)

1. Packaging machine (10) for packaging items to be packaged by means of a stretchable film, comprising a film transport apparatus (12) for feeding film to an item to be packaged and a blade device (13) which can be transferred from an idle position (40) to an extended position (41) by a drive (9) with a drive force and which has a return mechanism (31a) spatially separated from the drive (9), it being possible to activate the return mechanism (31a) with the transfer of the blade device (13) from the idle position (40) to the extended position (41), and it being possible, by means of the return mechanism (31a) in the activated state, to exert a return force on the blade device (13) in the extended position (41) in the direction (30) of the idle position (40), which force is greater than the return resistance of the blade device (13) in the extended state (41), by means of which resistance the blade device (13) is held in the extended state (41) without the action of the drive force, characterized in that the blade device (13) has a blade (15) for cutting film from the film feed (11) and the film can be cut by the blade device (13) in the extended position (41), in that the blade device (13) is connected via the return mechanism (31a) to a housing (17) surrounding the blade device (13), in that the blade device (13) has a blade guide (14), the return mechanism (31a) having a second resilient element (45a) which is fastened at one end to the blade guide (14) and at the other end to the blade (15), and in that the blade (15) can be transferred from a first blade position (43) within the blade guide (14) to a second blade position (44) in which the blade (15) protrudes beyond the blade guide (14) by tensioning the second resilient element (45a), and can be transferred from the second blade position (44) back to the first blade position (43) by relaxing the second resilient element (45a).
2. Packaging machine according to claim 1, characterized in that the return mechanism (31a) has a first resilient element (32a) which is fastened in particular indirectly to the blade (15) of the blade device (13).
3. Packaging machine according to claim 2, characterized in that the first resilient element (32a) is designed as a compression spring (33a) and is preferably connected to the blade device (13) by means of a rod (34a).
4. Packaging machine according to any of the preceding claims, characterized in that the blade guide (14) has one or more guide plates (14a, 14b), preferably in the form of two opposing guide plates (14a, 14b).
5. Packaging machine according to any of the preceding claims, characterized in that the second resilient element (45a) of the return mechanism (31a) is in the form of a leaf spring (46a).
6. Packaging machine according to any of the preceding claims, characterized in that the film feed (11) has a film guide element (19) with a cutting gap (23), which element is spaced apart from the blade device (13) in the idle position (40) by a film feed gap (22), the blade device (13) abutting the film guide element (19) in the extended position (41).
7. Packaging machine according to claim 6, characterized in that the blade (15), in the extended position (41) of the blade device (13), in particular the blade guide (14), protrudes through the cutting gap (23) of the film guide element (19).
8. Packaging machine according to any of claims 2 to 7, characterized in that the packaging machine (10) has further resilient elements (32b, 45b), in particular in the form of at least one further compression spring (33b) and/or at least one further leaf spring (46b).
9. Packaging machine according to any of the preceding claims, characterized in that the blade guide (14) has at least one sliding block guide (49a), in particular two sliding block guides (49a, 49b), for at least one sliding block (48a) formed on the blade, in particular two sliding blocks (48a, 48b).
10. Packaging machine according to claim 9, characterized in that at least one, in particular circular, spacer (16a) is arranged on the blade guide (14) between the blade guide (14) and the housing (17) surrounding the blade device (13), which spacer can be guided along the housing (17) of the blade device (13) during the transfer of same from the idle position (40) to the extended position (41), with in particular two spacers (16a, 16b) being arranged opposite one another on the blade guide (14).
11. Packaging machine according to claim 10, characterized in that the sliding block (48a, 48b) is arranged on the housing (17), reaches through the spacer (16a) and engages in the sliding block guide (49a) of the blade guide (14), with in particular one sliding block (48a, 48b) in each case reaching through two opposing spacers (16a, 16b) and in each case engaging in a sliding block guide (49a, 49b) of the blade guide (14).
12. Packaging machine according to any of claims 6 to 11, characterized in that the film guide element (19) has contact surfaces (20a, 20b) on the cutting gap (23), in particular rubber lips, for attaching the film.
13. Packaging machine according to any of the preceding claims, characterized in that the drive (9) has a pressure magnet (25) which preferably acts only in the cutting direction (27) of the blade device (13).
14. Packaging machine according to any of the preceding claims, characterized in that the drive (9) and/or the return mechanism (31a, 31b) has in particular U-shaped coupling elements (38a, 38b) for connection to the blade (15), which can preferably be introduced into recesses (47a, 47b) of the blade guide (14).

Images