Drive device for a sealing jaw

Abstract

The present invention relates to a vertical flow wrapper, comprising: - a frame, - a web feeding device for preferably continuously feeding a web to a forming shoulder and a forming filling tube, which form the web into a web tube, - a longitudinal sealing device for sealing together the longitudinal edges of the web tube, and - a transverse sealing device for providing a transverse seal to the web tube to produce individual packages, wherein the transverse sealing device comprises sealing jaws, an electric motor and a jaw closing mechanism arranged between the electric motor and the sealing jaws, and wherein optionally, the sealing jaws and the jaw closing mechanism reciprocate between an upper vertical position and a lower vertical position.

Description

[0001] The present invention relates to a vertical flow wrapper, comprising:

[0002] - a frame,

[0003] - a web feeding device, preferably continuously feeding a web to a forming shoulder and a forming filling tube, which forms the web into a web-tube,

[0004] - a longitudinal sealing device for sealing the longitudinal edges of the web-tube together, and

[0005] - a transverse sealing device for providing a transverse seal to the web-tube to produce individual packages,

[0006] wherein the transverse sealing device includes a sealing jaw, a closing motor, and a jaw closing mechanism disposed between the closing motor and the sealing jaw, and wherein the sealing jaw and the jaw closing mechanism reciprocate between an upper vertical position and a lower vertical position.

[0007] The present invention relates to a vertical flow wrapper. A flow wrapper, also known as a flow wrapping machine, is a packaging machine that accommodates a flat continuous web, such as a plastic material film such as a thermoplastic material, which is preferably continuously conveyed and passed downward through a forming shoulder and a vertical forming filling tube, and is wound around the vertical forming filling tube of the flow wrapper to form a tube, i.e., a tubular web. After winding around the vertical forming filling tube, the web is longitudinally enclosed by a longitudinally extending seal, in particular by thermally sealing the transverse / longitudinal edges of the web or by thermally sealing near these edges to connect them together, thereby applying the seal to the web. This is achieved by a so-called longitudinal sealing device. The tubular web typically has a cross-sectional area with a rectangular, oval, circular, pentagonal, or irregular shape. The tubular web is enclosed by a transverse sealing device, preferably in a direction substantially perpendicular to the flow direction of the web, i.e., transversely. Thereby, individual packages are defined from the continuous tubular web. Products such as food are introduced into the package by dropping the product into the forming filling tube and into the tubular web surrounding the forming filling tube. During and / or after filling, the tubular web is transversely opened at its upper end, i.e., not transversely sealed. During and / or after filling, the tubular web moves downward together with the product, and then a top transverse seal is formed above the product, thereby producing a sealed package. As a final step in applying the top seal or simultaneously with applying the top seal, the package is separated from the tubular web by a cutting device. There is a continuing need to increase the productivity and / or reliability of such vertical flow wrappers.

[0008] Accordingly, an object of the present invention is to provide a vertical flow wrapper with improved productivity and / or reliability.

[0009] This object is achieved by providing a vertical flow wrapper comprising:

[0010] - a frame,

[0011] - a web feeding device for preferably continuously feeding a web to a forming shoulder and a forming filling tube which forms the web into a web tube,

[0012] - a longitudinal sealing device for sealing together the longitudinal edges of the web tube, and

[0013] - a transverse sealing device for providing transverse seals to the web tube to produce individual packages,

[0014] wherein the transverse sealing device comprises sealing jaws, a hermetic motor and a jaw hermetic mechanism arranged between the hermetic motor and the sealing jaws, and wherein the sealing jaws and the jaw hermetic mechanism are reciprocated between an upper vertical position and a lower vertical position under the drive of a reciprocating motor,

[0015] wherein the hermetic motor is arranged at the frame and a torque transmission device is arranged between the hermetic motor and the jaw hermetic mechanism,

[0016] and wherein the hermetic motor and the reciprocating motor are operated independently of each other.

[0017] The disclosure regarding this embodiment of the present invention is also applicable to other embodiments of the present invention, and vice versa. The subject matter disclosed regarding this embodiment of the present invention can also be combined with other subject matters disclosed regarding this embodiment and / or other embodiments of the present invention, and vice versa.

[0018] The present invention relates to a vertically flowing wrapper, preferably operated continuously. A vertically flowing wrapper is a packaging machine that accommodates a continuous planar web, such as a plastic film of a thermoplastic material. The web is preferably conveyed continuously and downward through a forming shoulder and a vertical form-fill tube, and is wound around the vertical form-fill tube of the flow wrapper to form a tubular form, i.e., a tubular web. After winding around the vertical form-fill tube, the web is longitudinally sealed by a longitudinally extending seal, in particular by heat-sealing the transverse / longitudinal edges of the web or by heat-sealing in the vicinity of these edges to join them together, thereby applying the seal to the web. This is achieved by a so-called longitudinal sealing device. The tubular web typically has a cross-sectional area in the shape of a rectangle, oval, circle, pentagon, or irregular shape. The tubular web is sealed by a transverse sealing device, preferably in a direction substantially perpendicular to the flow direction of the web, i.e., transversely. Thereby, individual packages are defined from the continuous tubular web. Products such as food are introduced into the package by passing the product through the form-fill tube and into the tubular web. During the filling process, the tubular web is transversely opened at its upper end, i.e., not transversely sealed. While filling and / or after filling, the tubular web moves downward together with the product, and then a top transverse seal is formed above the product, thereby producing a sealed package. As a final step in applying the top seal or simultaneously with applying the top seal, each package is separated from the tubular web by a cutting device. The cutting device is preferably part of the transverse sealing device.

[0019] The transverse sealing device includes two sealing jaws, a closing motor, and a jaw closing mechanism provided between the closing motor and the sealing jaws. The closing motor is preferably an electric motor, more preferably a servo motor or a motor having a position transmitter at the output shaft. The jaw closing mechanism preferably converts the rotation of the motor shaft into a linear movement of the sealing jaws. The closing motor and the jaw closing mechanism move the closing jaws relative to each other between an open position and a sealing position. Those skilled in the art understand that only one sealing jaw needs to be moved. However, the movement of both sealing jaws is preferred. In the open position, the sealing jaws are away from each other; i.e., at least one sealing jaw does not contact or only very little contacts the formed web, while in the sealing position, the two sealing jaws press the tubular web together and provide a transverse seal, and optionally cut the tubular web. The movement between the open position and the sealing position of the sealing jaws is preferably achieved by the reciprocating movement of the motor.

[0020] Preferably, the sealing jaws and the jaw closing mechanism reciprocate between an upper vertical position and a lower vertical position. During the downward movement, a transverse seal is applied to the continuously moving web tube. After the transverse seal is applied, the transverse sealing device moves upward again. This movement is driven by a reciprocating motor, preferably an electric motor, more preferably a servo motor or a motor having a position sensor at the output shaft. The transverse sealing device and the jaw closing mechanism preferably reciprocate between the upper dead centre and the lower dead centre. The reciprocating motor driving this movement is preferably fixed to the frame of the vertical flow wrapper. To provide the vertical reciprocating movement of the jaws, a crank mechanism or a linear system, such as a spindle or a linear power transmission, can be used.

[0021] According to the invention, the closing motor for opening and closing the sealing jaws is arranged at the frame of the vertical flow wrapper, and a torque transmission device is arranged between the closing motor and the jaw closing mechanism. The torque transmission device is connected to the output shaft of the closing motor and the input shaft of the jaw closing mechanism. The torque transmission device transmits the rotation from the output shaft of the closing motor to the input shaft of the jaw closing mechanism. The transmission ratio is preferably at least approximately 1:1.

[0022] Furthermore, according to the invention, the closing motor and the reciprocating motor operate independently of each other. In particular, during the movement of the sealing jaws from the upper vertical position to the lower vertical position, more preferably during sealing, the closing motor does not need to adjust the position of the sealing jaws and / or the rotational position of the torque transmission mechanism. During sealing, the position of the closing mechanism is not adjusted. The closing motor only needs to open and close the sealing jaws, and does not need to keep the sealing jaws open or closed during the vertical reciprocating movement of the sealing jaws and the jaw closing mechanism.

[0023] Therefore, the closing motor actuating the sealing jaws is completely or rarely involved in the upward and / or downward movement of the sealing jaws and the jaw closing mechanism. This reduces the inertia of the transverse sealing device moving up and down, and may result in a faster vertical movement of the transverse sealing jaws and / or less energy consumption and / or less vibration.

[0024] Since the control system of the flow wrapper according to the invention preferably does not need to provide continuous or semi - continuous set values to the closing motor during the vertical reciprocating movement of the sealing jaws and the jaw closing mechanism, it can be simplified. Preferably, the closing motor only needs a signal of the vertical position where the sealing jaws need to be opened or closed. During the vertical reciprocating movement of the sealing jaws and the jaw closing mechanism, preferably, the output shaft of the closing motor does not rotate to compensate for the movement of the sealing jaws due to their vertical movement. Preferably, only the closing motor is needed to open and close the sealing jaws.

[0025] Preferably, the motor adjusts its torque to adjust the sealing force required during sealing. Optionally or additionally, during sealing, the film material is partially melted so that the thickness of the film is reduced. Preferably, the position of the sealing jaws is corrected during the sealing process.

[0026] The hermetic motor can be connected to the frame by a sliding bearing, preferably the sliding bearing allows movement only along one plane (preferably an almost horizontal plane), preferably via a linear movement platform. Optionally, the hermetic motor can be pivotally connected to the frame. According to another preferred embodiment of the present invention, this plane is set at a small angle relative to the horizontal plane, preferably less than 20°, more preferably less than 10°, and even more preferably less than 5°.

[0027] In this case, in the vertical direction, the hermetic motor is preferably arranged at a position of the frame between the upper dead center and the lower dead center of the movement of the sealing jaws, preferably near or at the middle of the vertical distance between the upper dead center and the lower dead center.

[0028] This object is also achieved by providing a vertical flow wrapper, which comprises:

[0029] - a frame,

[0030] - a web feeding device, preferably continuously feeding a web to a forming shoulder and a forming filling tube, which forms the web into a web tube,

[0031] - a longitudinal sealing device for sealing the longitudinal edges of the web tube together

[0032] - a transverse sealing device for providing a transverse seal to the web tube to produce individual packages,

[0033] wherein the transverse sealing device comprises sealing jaws, a hermetic motor and a jaw hermetic mechanism arranged between the hermetic motor and the sealing jaws, wherein the sealing jaws and the jaw hermetic mechanism reciprocate between an upper vertical position and a lower vertical position driven by a reciprocating motor, and wherein the hermetic motor is arranged at the frame, and a torque transmission device is arranged between the hermetic motor and the jaw hermetic mechanism, and wherein the vertical movement of the sealing jaws and the jaw hermetic mechanism does not affect the position of the sealing jaws.

[0034] The disclosure regarding this embodiment of the present invention is also applicable to other embodiments of the present invention, and vice versa. The subject matter disclosed regarding this embodiment of the present invention can also be combined with other subject matters disclosed regarding this embodiment and / or other embodiments of the present invention, and vice versa.

[0035] According to this embodiment of the present invention, the vertical movement of the sealing jaws and the jaw closing mechanism does not affect the position of the sealing jaws. Preferably, the reciprocating movement of the jaw closing mechanism and the sealing jaws and the jaw closing mechanism is mechanically decoupled. Preferably, the sealing jaws are neither opened nor closed by their vertical movement.

[0036] Preferably, the sealing pressure provided by the closing motor and the closing mechanism remains constant throughout the sealing operation. During the vertical reciprocating movement of the sealing jaws and the jaw closing mechanism, the closing motor does not need to readjust the position of the sealing jaws. Preferably, the stiffness of the closing mechanism does not change during the vertical reciprocating movement of the sealing jaws and the jaw closing mechanism. If the stiffness of the closing mechanism changes during the vertical reciprocating movement of the sealing jaws, it is preferably compensated by the jaw closing mechanism.

[0037] This object is also achieved by providing a vertical flow wrapper comprising:

[0038] - a frame,

[0039] - a web feeding device, preferably continuously feeding a web to a forming shoulder and a forming filling tube, which forms the web into a web tube

[0040] - a longitudinal sealing device for sealing the longitudinal edges of the web tube together, and

[0041] - a transverse sealing device for providing a transverse seal to the web tube to produce individual packages,

[0042] wherein the transverse sealing device comprises sealing jaws, a closing motor and a jaw closing mechanism arranged between the closing motor and the sealing jaws, and wherein the sealing jaws and the jaw closing mechanism reciprocate between an upper vertical position and a lower vertical position under the drive of a reciprocating motor,

[0043] wherein the closing motor is arranged at the frame, and a torque transmission device is arranged between the closing motor and the jaw closing mechanism,

[0044] and wherein the range of vertical movement of the jaws is greater than the range of horizontal movement of the jaw drive motor.

[0045] The disclosure regarding this embodiment of the present invention is also applicable to other embodiments of the present invention, and vice versa. The subject matter disclosed regarding this embodiment of the present invention can also be combined with other subject matters disclosed regarding this embodiment of the present invention and / or other embodiments of the present invention, and vice versa.

[0046] According to this embodiment of the invention, the range of the vertical movement of the jaws is greater than the range of this movement, which is in particular the horizontal movement of the closing motor driving the jaws. The movement of the closing motor according to the invention represents the movement of the closing motor as a whole. The movement of the closing motor can be a linear and / or rotational movement.

[0047] Preferably, during the entire operation of the vertical flow wrapper, the movement of the closing motor is zero or substantially zero. Only the output shaft of the closing motor rotates.

[0048] Preferably, during the reciprocating movement of the sealing jaws between the upper vertical position and the lower vertical position, the closing motor slides along a plane having at least a horizontal component, preferably along a horizontal plane. Preferably, the frame of the vertical flow wrapper includes a platform, and the closing motor for opening and closing the sealing jaws is slidably disposed on the platform.

[0049] Optionally or additionally, during the reciprocating movement of the sealing jaws between the upper vertical position and the lower vertical position, the closing motor rotates relative to the frame, preferably about an axis perpendicular to the movement of the web or perpendicular to the vertical.

[0050] Preferably, the torque transmission device includes at least two rotating bodies, more preferably at least two wheels, wherein preferably, one rotating body is connected to the shaft of the closing motor, and one rotating body is connected to the input shaft of the jaw closing mechanism. The two rotating bodies are rotatably connected, preferably without slipping, which transmits the rotation from one rotating body to the other. The rotating bodies preferably have the same diameter. The connecting member can be at least one rod, and each rod is eccentrically connected to two adjacent rotating bodies. Optionally or additionally, the two rotating bodies can be connected by an endless belt, preferably by a toothed belt or a metal belt, which is fixedly connected to the two rotating bodies.

[0051] Preferably, a spacing device is provided between two adjacent rotating bodies so as to maintain a certain distance between the two rotating bodies. The spacing device is preferably a rod or a bar. Preferably, the spacing device is disposed between the rotational axes of the two rotating bodies.

[0052] Preferably, the device for transmitting torque from the motor to the jaw closing mechanism is a Schmidt-coupling. For example, www.Schmidt-kupdump.com discloses the Schmidt-coupling. Since the Schmidt-coupling is used as the torque transmission device, during the vertical reciprocating movement of the sealing jaws, the movement of the motor is zero.

[0053] Further details, features and advantages of the present invention are described by the following description of the drawings and the preferred embodiments based on the drawings. The drawings only show exemplary embodiments of the present invention, which do not limit the basic idea of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 Schematically shows a flow wrapper according to a preferred embodiment of the present invention.

[0055] Figures 2a to 2d Schematically shows gears that transmit the rotation of a motor to the linear movement of a sealing jaw, respectively.

[0056] Figure 3 Depicts the state of the prior art.

[0057] Figures 4a to 4f Depicts different embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0058] In the different drawings, the same components always have the same reference numerals and are therefore generally named or mentioned only once.

[0059] In Figure 1 , schematically shows a flow wrapper 1 according to the present invention, which includes a frame 8. Preferably, a web (here a film 4, in particular a weldable plastic film 4) is continuously supplied from a reel 9 to a forming shoulder 3, which shapes the web 4 into a tube around a forming filling tube 2. In the context of the present invention, the "tubular form" of the package 7 or the web 4 means any cross-sectional form, including circular or other forms, in particular rectangular or substantially polygonal. A longitudinal sealing device 5 provided downstream of the forming shoulder 3 seals the edges of the tubular web 4 together. A transverse sealing device 6 provides a transverse seal to the tubular web 4 at the downstream end of each of the packages 7. Subsequently, the packages are filled with packaging articles. Finally, an upstream transverse seal is applied to the web tube 4 by the transverse sealing device 6, which hermetically closes each package 7. The transverse sealing device 6 preferably simultaneously applies an upstream transverse seal that closes the top of the package 7 and a downstream transverse seal that defines the bottom of the subsequent, upstream package 7. The packages 7 are separated from each other by a cutting device 6, which is preferably incorporated into the transverse sealing device 6. For the application of each transverse seal, the sealing jaws reciprocate from an open position, where the sealing jaws are spaced apart, to a sealing position, where the sealing jaws are pressed together and pressure is applied to the film tube.

[0060] For continuous production of packages, the sealing jaws reciprocate between a top dead center and a bottom dead center. The distance between the two dead centers depends on the length of the packages to be produced. During the downward movement of the sealing jaws, the transverse seal is applied. During the downward movement, the jaws move in this direction at substantially the same speed as the continuously fed web.

[0061] Figures 2a to 2cDifferent embodiments of the jaw closing mechanism 13 for opening and closing the sealing jaws 10, 11 are depicted. The reciprocating movement of the sealing jaws 10, 11 between the open and closed positions is indicated by the double arrow 12 and is typically a horizontal movement transverse to the conveying direction of the web. During this reciprocating movement, the sealing jaws move along the guiding means 25. The sealing jaws are driven by a closing motor M (not shown), and the closing motor M provides torque and thus provides rotation 14. A jaw closing mechanism 13 is provided between the closing motor M and the jaws 10, 11, and the jaw closing mechanism 13 converts the rotation 14 of the closing motor M into a linear movement of the jaws 10, 11 along the guiding means 25. Those skilled in the art understand that moving one of the jaws 10, 11 is sufficient for applying a transverse seal, but it is preferred to move both jaws 10, 11. The jaw closing mechanism 13 preferably uses a linkage system, and even more preferably a knee lever system. The advantage of these systems is that they amplify the force provided by the closing motor when the jaws are closed and ensure rapid movement during the opening of the jaws 10, 11.

[0062] In the example according to Figure 2a , a knee lever system as the jaw closing mechanism is depicted. The lever pivots clockwise and counterclockwise around the pivot point 15 as indicated by the double arrow 14. The two ends of this follower lever are connected to additional levers, where each of these levers is connected to the sealing jaws 10, 11. During the clockwise rotation of the follower lever, the jaws 10, 11 move away from each other, such that the sealing jaws move to the open position, while the counterclockwise rotation moves the sealing jaws to the sealing position.

[0063] Regarding the embodiment according to Figure 2b , reference may be made to the disclosure of the embodiment in Figure 2a . Again, a knee lever system is shown, and again, the follower lever pivots around the pivot point 15, and again, the clockwise rotation moves the jaws 10, 11 to the open position, while the counterclockwise rotation moves the sealing jaws to the sealing position.

[0064] In the embodiment according to Figure 2c , a jaw closing mechanism 13 with two knee lever systems and two pivot points 15 is shown. A motor (not shown) provides a rotational movement 14, which is transmitted to the first knee lever system. The second lever of this knee lever system drives the second knee lever system, i.e., the knee lever system shown in Figure 2b . A clockwise rotation of the motor causes the sealing jaws to open, while a counterclockwise rotation moves the sealing jaws to the sealing position.

[0065] In Figure 2d , a simplified schematic view of the sealing jaws 10, 11 and the jaw closing mechanism 13 is shown. The jaw closing mechanism 13 can be as in Figures 2a to 2cas shown. However, those skilled in the art understand that the jaw closing mechanism can be different from Figures 2a to 2c the embodiment shown. As Figure 2d additionally shown, the sealing jaws and the jaw closing mechanism optionally reciprocate between an upper vertical position and a lower vertical position, preferably between a top dead center and a bottom dead center. This movement is indicated by the double arrow 16.

[0066] Figure 3 An embodiment according to the prior art is shown. In this embodiment, the motor M moves together with the sealing jaws 10, 11 during the vertical movement 16 of the sealing jaws 10, 11. Due to the large inertial mass, the dynamics of the system are small.

[0067] Figures 4a to 4f A different embodiment of the present invention is shown. The common point of all examples is that the movement 16 of the sealing jaws 10, 11 is decoupled from the closing motor M. The closing motor M is not at all involved or is only involved in a reduced range of the movement 16 of the sealing jaws. The motor is fixed to the frame instead of being fixed to the sealing jaws 10, 11 and / or the jaw closing mechanism 13 as Figure 3 shown in the embodiment. During the movement 16, the position of the sealing jaws is independent of their vertical position. The closing motor does not need to adjust its position according to the vertical position of the sealing jaws.

[0068] In an embodiment according to Figure 4a ..., the closing motor M is attached to the frame of the vertical flow wrapper. A sliding bearing, such as a sliding platform, is provided between the frame and the closing motor. A torque transmission device 20 is provided between the closing motor M and the jaw closing mechanism 13, and this torque transmission device transmits torque from the motor to the jaw closing mechanism 13. In this example, the torque transmission device 20 includes two rotating bodies 17, 19 (here wheels 17, 19), and the two rotating bodies 17, 19 are connected by two rods 18, and the rods are each eccentrically arranged on the rotating bodies 17 and 19. When the rotating body 17 is connected to the frame of the vertical flow wrapper, the rotating body 19 participates in the vertical movement 16 of the sealing jaws 10, 11. During this vertical movement 16, as indicated by the double arrow 21, the closing motor M and the rotating body 17 slide along the sliding bearing 8. Those skilled in the art understand that this movement 21 is smaller than the movement 16. Compared with the embodiment according to Figure 3 ..., this results in less inertia and thus a system with higher dynamics.

[0069] In an embodiment according to Figure 4b ..., the closing motor and the rotating body 17 can pivot around a pivot bearing 22, and this pivot bearing 22 is provided at the frame of the vertical flow wrapper of the present invention. Such rotation indicated by the double arrow occurs during the movement 16. Compared with the embodiment according to Figure 3Compared with the embodiments, this results in less inertia and thus a more dynamic system.

[0070] Figure 4c Basically describes Figure 4a the embodiments, and thus reference can be made to Figure 4a the description. Here only a rod 18 is provided, and the rod 18 is arranged between two adjacent rotors.

[0071] In the embodiment according to Figure 4d reference can again be made to the embodiment according to Figure 4a However, in this example, a spacer device 24 is arranged between both rotors 17, 19. In addition, an annular device 23 is provided, such as a toothed belt or a metal belt fixedly connected to both rotors 17, 19, and the annular device 23 transmits torque from the rotor 17 to the rotor 19.

[0072] Regarding the embodiment according to Figure 4e reference can be made to the disclosure regarding Figure 4d Here additionally or alternatively the rod 18 is provided, and the rod 18 transmits torque from the rotor 17 to the rotor 19.

[0073] Those skilled in the art understand that regarding Figures 4c to 4e the embodiment, the bearings of the electric motor M and the rotor 17 can also be pivot bearings as shown in Figure 4b for example.

[0074] Figure 4f Another inventive embodiment of the invention is shown. In this example, a so-called Schmidt coupling is arranged between the enclosed electric motor and the jaw closing mechanism 13. The Schmidt coupling here includes three rotors 17, 19 and 26, and two adjacent rotors are torque-connected by a torque transmission device 18 for example. The attachment points of the torque transmission device 18 are selected such that during the vertical movement 16 of the sealing jaws 10, 11, the enclosed electric motor M does not move at all.

[0075] Regarding Figure 4f , in another embodiment not shown, the rotors 17, 19, 26 are as shown in the figure. However, these rotors 17, 19, 26 are preferably not rotationally connected by the rod 18, but by an annular device 23, such as a toothed belt or a metal belt, which is fixedly connected to the rotors 17, 19, 26 in order to transmit torque from the rotor 17 to the rotor 26 and from the rotor 26 to the rotor 19. Preferably, one annular device 23 is arranged between the rotor 17 and the rotor 26, and another annular device 23 is arranged between the rotor 26 and the rotor 19.

[0076] According to Figure 4a to Fig.Figure 4f All the invention embodiments have in common that the electric motor M not only provides torque to drive the rotation of the rotating body 17. During the vertical movement of the sealing jaws 10, 11 and the jaw closing mechanism 13, there is no need to adjust the closing and / or opening positions. During the vertical reciprocating movement of the sealing jaws 10, 11 and the jaw closing mechanism 13, the position of the lever of the jaw closing mechanism 13 does not change. This results in a constant stiffness of the closing mechanism and a constant sealing pressure.

[0077] Reference numerals

[0078] 1 Flow wrapper

[0079] 2 Forming and filling tube

[0080] 3 Forming shoulder

[0081] 4 Web, film / tubular web, tubular film

[0082] 5 Longitudinal sealing device

[0083] 6 Transverse sealing device and / or cutting device

[0084] 7 Package / bag

[0085] 8 Frame / housing

[0086] 9 Reel

[0087] 10 First jaw

[0088] 11 Second jaw

[0089] 12 Opening / closing movement of at least one jaw

[0090] 13 Jaw closing mechanism, crank mechanism

[0091] 14 Rotation

[0092] 15 Pivot point

[0093] 16 Vertical movement

[0094] 17 First rotating body, wheel

[0095] 18 Rod, lever

[0096] 19 Second rotating body, wheel

[0097] 20 Torque transmission device

[0098] 21 Sliding movement

[0099] 22 Bearing at the frame

[0100] 23 Ring belt, toothed belt

[0101] 24 Spacing device

[0102] 25 Guide device

[0103] 26 Third rotating body, wheel

[0104] M Hermetic motor

Claims

1. A vertical flow wrapper (1), comprising: - Frame (8), - A web feeding device that continuously feeds a web (4) to a forming shoulder (3) and a forming filling tube (2), where the forming shoulder (3) and the forming filling tube (2) form the web (4) into a web tube, - A longitudinal sealing device (5) that seals the longitudinal edges of the web tube together, and - A transverse sealing device (6) that provides a transverse seal to the web tube to produce individual packages, wherein the transverse sealing device (6) includes sealing jaws (10, 11), a hermetic motor (M), and a jaw hermetic mechanism (13) disposed between the hermetic motor (M) and the sealing jaws (10, 11), and the sealing jaws (10, 11) and the jaw hermetic mechanism (13) reciprocate between an upper vertical position and a lower vertical position under the drive of a reciprocating motor, wherein the hermetic motor (M) is disposed at the frame (8), and a torque transmission device (20) is disposed between the hermetic motor (M) and the jaw hermetic mechanism (13), wherein the hermetic motor and the reciprocating motor are operated independently of each other, characterized in that the hermetic motor is connected to the frame by a sliding bearing, or the hermetic motor is pivotally connected to the frame.

2. The vertical flow wrapper according to claim 1, wherein, The vertical movement of the sealing jaws (10, 11) and the jaw hermetic mechanism (13) does not affect the position of the sealing jaws (10, 11).

3. The vertical flow wrapper according to claim 1, wherein, The range of vertical movement of the sealing jaws (10, 11) is greater than the range of horizontal movement of the hermetic motor (M).

4. The vertical flow wrapper according to claim 1, wherein, The vertical movement of the hermetic motor (M) or all of the movement of the hermetic motor (M) is zero or substantially zero.

5. The vertical flow wrapper (1) according to claim 1, wherein, During the reciprocating movement of the sealing jaws (10, 11) between the upper vertical position and the lower vertical position, the hermetic motor (M) slides along a plane having at least a horizontal component.

6. The vertical flow wrapper (1) according to claim 5, wherein, During the reciprocating movement of the sealing jaws (10, 11) between the upper vertical position and the lower vertical position, the hermetic motor (M) slides along a horizontal plane.

7. The vertical flow wrapper (1) according to any one of claims 1 to 6, wherein, The hermetic motor (M) rotates relative to the frame (8) during the reciprocating movement of the sealing jaws (10, 11) between the upper vertical position and the lower vertical position.

8. The vertical flow wrapper (1) according to claim 7, wherein, The hermetic motor (M) rotates about a horizontal axis during the reciprocating movement of the sealing jaws (10, 11) between the upper vertical position and the lower vertical position.

9. The vertical flow wrapper (1) according to claim 1, wherein, The torque transmission device (20) includes at least two rotating bodies (17, 19, 26) that are rotatably connected.

10. The vertical flow wrapper (1) according to claim 9, wherein, Two rotating bodies (17, 19, 26) are wheels, and the rotating bodies are connected without slipping.

11. The vertical flow wrapper (1) according to claim 9, wherein, At least one rod (18) is eccentrically connected to the two rotating bodies (17, 19, 26).

12. The vertical flow wrapper (1) according to claim 9, wherein, The two rotating bodies (17, 19, 26) are rotatably connected by an endless belt, and the endless belt is a toothed belt or a metal belt fixedly connected to the two rotating bodies (17, 19, 26).

13. The vertical flow wrapper (1) according to claim 9, wherein a spacing device (24) is provided between two rotating bodies (17, 19, 26).

14. The vertical flow wrapper (1) according to any one of claims 9 to 13, wherein, The torque transmission device (20) is a Schmidt coupling.

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