Source: https://patents.google.com/patent/JPH11147512A/en
Timestamp: 2020-06-07 04:07:29
Document Index: 323512668

Matched Legal Cases: ['art 3', 'Application No. 4216207', 'art 2', 'art 3', 'art 4', 'art 3', 'art 3', 'art 4', 'art 5']

JPH11147512A - Lifting apparatus and packaging machine - Google Patents
Lifting apparatus and packaging machine
JPH11147512A
JPH11147512A JP22587998A JP22587998A JPH11147512A JP H11147512 A JPH11147512 A JP H11147512A JP 22587998 A JP22587998 A JP 22587998A JP 22587998 A JP22587998 A JP 22587998A JP H11147512 A JPH11147512 A JP H11147512A
JP22587998A
JP3041606B2 (en
ナッテレル ヨハン
Multivac Sepp Haggenmueller Kg
マルチバック セップ ハーゲンミーラー ゲゼルシャフト ミット ベシュレンクテルハフツング ウント コー．
1997-08-08 Priority to EP97113794.8 priority Critical
1997-08-08 Priority to EP19970113794 priority patent/EP0895933B2/en
1998-08-10 Application filed by Multivac Sepp Haggenmueller Kg, マルチバック セップ ハーゲンミーラー ゲゼルシャフト ミット ベシュレンクテルハフツング ウント コー． filed Critical Multivac Sepp Haggenmueller Kg
1999-06-02 Publication of JPH11147512A publication Critical patent/JPH11147512A/en
2000-05-15 Publication of JP3041606B2 publication Critical patent/JP3041606B2/en
2004-01-16 First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8227191&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=JPH11147512(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
PROBLEM TO BE SOLVED: To reduce the number of workers and to prevent wear of materials by a method wherein a lift member operating for a second closing stroke following a first closing stroke of a second tool member is constructed of a driving means and a mechanical transmission means generating a fixed closing force. SOLUTION: A lifting apparatus for moving a lower tool member 9 of a deaeration seal part 3 serving as an operating member to a closing position against an upper tool member 8 is constructed of piston cylinder devices 12 and 12 respectively connected to a horizontal member 11, and the cylinders 13 of the piston cylinder devices are joined to a base 7. The lifting apparatus moves to a closing position at the first closing stroke. Furthermore, a power lift member 20 is provided so that a closing force is generated at the second closing stroke that follows the first closing stroke in the distance smaller than the first stroke. The power lift member 20 is composed of a housing 21 and a lift rod 22 and is so constructed that it generates the force at the second closing stroke when resistivity is developed at the first closing stroke. With such structure, a lifting apparatus that is improved in such an aspect of requiring fewer workers can be obtained.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes a first tool member of a packaging machine (packaging machine) and a second tool member mounted to move with respect to the first tool member. The present invention relates to a lift device (lift device) for a work unit (work station).
2. Description of the Related Art Conventionally, a packaging machine has a work section for performing various operations such as molding, filling, sealing, and cutting. The lift device moves at least a movable member of the working unit to the working position. In this position, the increased closing force for closing the tool member of the working part requires the packaging web (we
Required to fix b). For example, to mold a portion of a plastic sheet material, the chamber is sealed, and the sheet material is molded using fluid from a source of compressed air. The high pressures used for fast and accurate molding operations place high loads on the molding. In order to receive this high load when the working unit is closed, it is necessary to have a closing device that generates a closing force larger than the load applied during operation. A simple one is a piston cylinder device with a correspondingly large effective area.
However, the device is very expensive due to the high air consumption required for the entire lift stroke. Other devices include a toggle lever system that generates a high force at one end of the transmission process by a mechanical transmission force. A disadvantage of such a toggle lever system is that it produces a defined closing action with a so-called dead center. Therefore, at dead center, a closing tolerance is observed to generate the required closing force, while that force depends on the thickness of the material web. However, the thickness of the material depends on the intended application and therefore varies within wide limits. Therefore, the adjustment of the lifting device must be performed each time the thickness of the material changes. This requires many workers.
[0004] German Patent Application No. 4216207 states that
A lifting device for a cutting section of a packaging machine is disclosed. The lift device comprises a piston cylinder device having a piston rod configured to have an abutment at its free end. At the end of the lift stroke with this piston-po-cylinder device, the piston rod is raised further by pushing the wedge-shaped member into a recess corresponding to the piston rod, and in the resulting final position the piston cylinder device Produces a force that is greater than the force produced by However, the frictional force created by pushing the wedge causes the material to wear quickly.
It is an object of the present invention to provide an improved lifting device for the working part of a packaging machine.
It is another object of the present invention to provide a lifting device for a working part of a packaging machine which operates irrespective of the thickness of the packaging material, does not require adjustment, and requires little tolerance. It is in.
To achieve the above object, according to the present invention, in a lifting device for a working unit of a packaging machine, the working unit comprises a first tool member,
A second tool member mounted movably with respect to the first tool member, wherein the lifting device includes a first closure of the second tool member toward the first tool member. A first lift member for performing a stroke, and a second lift member for performing a second closing stroke subsequent to the first closing stroke, wherein the second lift member includes a driving unit. When,
A mechanical transmission means for generating a substantially constant closing force for performing the second closing stroke when a resistance force is generated.
[0008] The working part is therefore closed in two stages. The first closing stroke to the working part is a longer stroke and requires a relatively low force. The required force of the working part is then generated by the second closing stroke, while accepting the forces acting during operation. Power lift members
It generates the force required for the second closing stroke independent of the means acting on the first closing stroke. This required force is always generated at the end of the closing stroke. A further advantage of the lifting device is that the power lift member for generating the second closing stroke is small, designed to be space-saving and has high wear resistance.
FIG. 1 is a side view of a packaging machine according to an embodiment of the present invention, in which a side cover is removed.
As shown in FIG. 1, the packaging machine comprises:
A machine frame 1 is provided with a forming part 2, a degassing sealing part 3, and a cutting part 4 arranged thereon. In a packaging machine, a film sheet 5 is fed to the entrance side of the machine. In the forming section, the film sheet 5 is formed so as to form the container 6. After filling the containers with a filling section (not shown), these containers are sealed with a deaeration sealing section 3 using a cover film, and finally separated using a cutting section 4. The machine frame 1
In addition, the film sheet 5 formed therein respectively
And a guide device for driving a chain for transporting the container 6.
FIG. 2 is a front view of the working unit in the package transport direction, showing an open state. FIG. 3 is a side view of the working unit of FIG. 2 in a direction perpendicular to the package conveying direction. FIG. 4 is a front elevational view in the longitudinal direction of the working unit in the transport direction, similar to FIG. 2, showing a closed state. FIG. 5 is a side view of the working unit at a position similar to FIG. 4 in a direction perpendicular to the transport direction.
As best shown in FIGS. 2-5,
Specifically, the working part, shown as the degassed sealing part 3, comprises a base 7 and an upper tool member 8 firmly fixed to this base
And a lower tool member 9 movably attached to the upper tool member. The base 7 and the upper tool member 8 of the working unit are connected to each other by a guide rod 10.
The lifting device moves the lower tool member 9 with respect to the upper tool member 8 from the open position shown in FIGS. 2 and 3 to the closed position shown in FIGS. 4 and 5, whereby the lower tool member 9 is moved. And the upper tool member 8 are provided for cooperating in the closed position. The lift device includes two piston cylinder devices 12 connected to each other via a cross member 11. Cylinder 13 of each piston cylinder device 12
Are respectively connected to the base 7. On the other hand,
The piston rod 14 carries the cross member 11 carrying the lower tool member 9.
Respectively. The cross member 11 and the lower tool member 9 connected thereto are provided with a guide sleeve 15 that slides along the guide rod 10.
In the first closing stroke, the piston-cylinder device is moved from the open position to the closed position and vice versa.
It is configured to move the lower tool member over a long stroke, on the order of 0 mm or more.
In order to receive the effective force generated by the working process in the closed position of the working part, the lifting device moves over a second closing stroke having a smaller lifting stroke than the first closing stroke. A second lift member, a so-called power lift member 20, is provided to generate a closing force. The power lift member 20 includes a housing 21 fixedly attached to the base 7 and a lift rod 2 whose position can be changed within the housing 21 in the lift (lift) direction.
And a movable member formed as 2. The end of the lift rod 22 facing the lower tool member 9 is
, And is therefore connected and fixed to the lower tool member 9.
As shown in FIGS. 6 to 11, the power lift member 20 is a drive cylinder formed as a piston-cylinder device 23 having a cylinder axis or a center axis M arranged in parallel to the lifting direction of the lower tool member 9. Part. The piston cylinder device 23 includes a cylinder 24,
A piston 25 whose position can be changed therein is provided.
The cylinder 24 has an opening 27 provided on a surface 26 facing the lower tool member 9. The lift rod 22
It extends through an opening 27 and is supported therein by a friction bearing and is sealed by a seal 28 with respect to the cylinder chamber. The piston 25 has a similar opening 29
And the lift rod 22 extends through this opening. The piston rod connected to the piston 25 is formed as a sleeve 30 in which the slidably extending and bearing lift rod 22 is supported by a friction bearing. The piston-cylinder device 23 further includes an inlet 31 and an outlet 3 for supplying and exhausting compressed air to and from the cylinder chamber, respectively.
The piston cylinder device 23 is connected to a housing 21 of a power lift member 20 which contains a mechanical force transmitting member as described in more detail below. The housing 21 has a top side 40 that contacts the side of the piston cylinder device 23 facing the surface 26 and faces the lower tool member 9. The sleeve 30 extends through an opening in the top side 40 of the housing 21 in a position-changeable manner similar to the lift rod 22 passing through the sleeve.
The housing 21 has a central axis M and a plane perpendicular to the side surface forming the chamber 50 that houses the mechanical force transmitting member.
It has a rectangular cross section. Bottom side 51 of housing 21
Has an opening 52 which connects the chamber 50 to a second chamber 53 of smaller cross section. 7, the second chamber 53 completely receives the free end 60 of the lift rod 22 in the open position of the working part.
The free end 60 of the lift rod 22 is shaped like a substantially inverted roof gable, and thus has a triangular cross-section in a plane parallel to the central axis M, as shown in FIG. End member or thrust member 61 having
It has. The thrust member 61 is therefore attached to the central axis M
Has surfaces 61a and 61b which form an acute angle with respect to.
The chamber 50 houses a gated link 55 that changes position between the top and bottom sides of the chamber 50. The upper end of the gate type link 55 facing the piston cylinder device is firmly fixed to the sleeve 30. As shown in FIG. 11, the gate type link 55 is composed of two parts, and in particular, as shown in FIGS. 6 to 10, two guide grooves 70a, 70b. A pair of rollers 90 at both ends extending across the chamber 50 are guideably received in the respective guide grooves 70a, 70b. Therefore, a total of four rollers 80
Is provided. The guide grooves 70a and 70b both extend in a direction that forms an obtuse angle with the central axis M. Roller 8
0 is movable due to limited guidance along the guide groove.
Opposite guide grooves 7 corresponding to a pair of rollers
The upper longitudinal edge of Oa defines a first plane 71a of transmission of force from gated link 55 to the pair of rollers. This plane exists at an obtuse angle with respect to the central axis M. With respect to the central axis M, the gate type link 55
The same applies to the other pair of upper longitudinal edges that define the corresponding first plane 71b.
A support 90 for the roller 80 is provided at a distance from the bottom of the housing 21. Support base 90
Is symmetrical and has two surfaces 90a, 90b. Each of these surfaces 90a, 90b supports a corresponding pair of rollers 80 at an acute angle to the central axis. The surfaces 90a, 90b are so inclined that a second plane extending along the plane 90a is slightly inclined with respect to a third plane extending along the surface 61a, and both surfaces are wedge-shaped. The angle between the central axis M is slightly different from the angle between the end member surfaces 61a, 61b and the central axis M. The same applies to surfaces 90b, 61b.
FIGS. 12 to 14 schematically show one side view of the cooperating elements of the power lift member according to FIG. 6, FIGS. 12 to 14 corresponding to the parts of FIGS. 8 to 10, respectively. ing.
As best shown in FIGS. 12-14, the first plane is substantially perpendicular to the second plane.
The angular ratio of the three planes is determined by the force F1 exerted by the piston cylinder device 23 during the second closing stroke.
And the force transmission ratio of the force F2 acting on the lower tool member 9 via the lift rod 22 is determined. Therefore, mechanical force transmission devices are designed to exert a substantially constant force,
Thereby, a force for the second closing stroke is generated when a resistance appears.
The operation of the lift device and the force transmission function of the present invention will be described with reference to FIGS. In the open position of the working section shown in FIGS.
Is separated from the upper tool member 8 and the lift rod 22 is at its lowest position, so that it is completely introduced into the power lift member 20. The piston 25 of the piston cylinder device 23 is at its upper stop (FIG. 7). By driving the piston-cylinder device 12 for the first closing stroke, the lower tool member 9
Moves along a first closing stroke having one lift stroke up to 200 mm or more. The lift rod 22
The power lift member 20 is connected to the cross member 11.
The lift rod 22 is pushed up by a distance corresponding to one lift stroke of the first closing stroke and arrives at the position shown in FIG. And the upper tool member 8 is shown in FIGS.
The closed state shown in FIG.
After completing the first lift stroke having the first closing stroke, the piston-cylinder arrangement 23 of the power lift member 20 is thereby actuated so as to start the second closing stroke. The compressed air passes through the inlet 31,
It is supplied to the piston cylinder device 23. Subsequently, the sleeve 30 is supplied to the piston cylinder device 23 through the gate type link 55 by the force F1. continue,
The sleeve 30 is moved by the force of F1 to the gate-type link 55.
Press down. The first flat surfaces 71a and 71b formed by the guide grooves 70a and 70b transmit the force applied from the sleeve 30 to the gate link 55 to the pair of rollers 80. The pair of rollers 80 are guided in a limited manner along the guide grooves 70a, 70b, respectively, and the drag acts on the inclined surfaces 90a, 90b of the support portion 90, so that both of the pair of rollers 80 are gate-type. During the downward movement of the link 55, it moves upward in the guide grooves 70a, 70b,
The inclined surface 61a of the thrust member 61 of the lift rod 22,
61b (FIG. 9). During further downward movement of the gated link 55, the rolls of each pair of rollers roll in opposite directions of rotation along the surfaces of the thrust member support and the opposing surface. Support portions 90a, 90
The rollers exert a force on the thrust member 61 as each surface of b forms a wedge-shaped angle with the corresponding opposing surface of the thrust member 61a, 61b. The force of the symmetrical arrangement acts on both surfaces 61a, 61b of the end member, whereby
The resultant force F2 is transmitted to the thrust member, whereby
The lift rod 22 is displaced upward. The components are sized such that the peak of the end member is between the pair of rollers at the bottom of the piston 25 (FIG. 10).
The principle of the transmission of the force from the piston cylinder device 23 to the lift rod 22 through the gate-type link 55 and the roller 80 is shown in FIGS.
It is shown again in FIG.
Along a relatively long single lift stroke, the relatively weak force F1 exerted by the piston 25 of the piston-cylinder device 23 on the gate-type link 55 exerts a lift with its relatively weak single lift stroke. This is converted into a relatively strong force F2 acting on the rod 22. Therefore, the force acting on the lower tool member 9 is stronger than the force acting on the piston cylinder device 23. Preferably, the closing force is between 2 and 30 times the force generated by the drive. In particular, a geometric arrangement that produces a closing force of about 10 times the closing force generated by driving the piston cylinder device 23 is preferred. The second closing stroke of the lower tool member 9 with respect to the upper tool member 8 is on the order of 1 mm to 10 mm. The closing force that can be generated for the second closing stroke is approximately 25 kN to 150 kN.
And depends on the size and function of the working unit.
Modifications of the device are possible. The lifting device may comprise one, two or several piston cylinders during the first closing stroke. Also, during the second closing stroke,
It may have two or more lift members.
According to another embodiment, the lifting device comprises:
As shown in FIGS. 2 to 5, a lever system is provided which works between the movable tool member 9 and the machine frame 1 of each part. The lever system 100 connects the movable lower tool member 9 to its open position and is used for lifting purposes of the entire lifting device, thereby operating the upper tool member 8 fixed away from the film sheet 5. Let it.
The lever system 100 includes the lower tool member 9
To the working unit base 7 and the machine frame 1.
The lever system 100 includes two double levers 101a,
101b. The fulcrums 102a and 102b of the levers 101a and 101b are connected to link points 107a and 107, respectively.
b the corresponding connecting rod 106 rotatably supported at b
a, 106b through the points 107a of the machine frame 1,
107b. Each lever 101a, 101
b has a corresponding pivot connection 103a, 1
It is rotatably connected to the base 7 through 03b. Another outer end of each lever 101a, 101b is a cross member 1
1 through the connecting rods 104a and 104b. Thereby, the link points 105a, 105b of the connecting rod at the intersection are, like the link points 108a, 108b of the connecting rod of the lever, a pivot connection. Therefore, the connecting rods 104a, 104b
The purpose is to transmit the vertical movement to the levers 101a, 101b and the base 7. In operation, moving the lower tool member 9 downward to the open position of the working part simultaneously results in an upward movement of the base 7 and of the entire lifting device with respect to the frame 1. Since the upper tool member 8 is connected to the base 7, the upper tool member is lifted with respect to the machine frame 1 and thus with respect to the film sheet 5. Therefore, the package 6 extending downward as well as upward can be transported without problems.
Although the embodiments of the present invention have been described, various modifications can be made without departing from the scope and spirit of the present invention.
An improved lifting device for the working part of the packaging machine can be provided.
Further, according to the present invention, it is possible to provide a lift device for a working part of a packaging machine which operates irrespective of the thickness of the package material, does not require adjustment, and does not require much tolerance. .
FIG. 1 is a side view of a packaging machine according to an embodiment of the present invention, with a side cover removed.
FIG. 2 is a front view of the working unit in a package transport direction, showing an open state.
FIG. 3 is a side view of the working unit of FIG. 2 in a direction perpendicular to a package conveying direction.
4 is an elevational view of the working unit in the transport direction, similar to FIG. 2, showing a closed state.
FIG. 5 is a side view of the working unit in a direction perpendicular to the transport direction in a state similar to FIG.
FIG. 6 is a cross-sectional view of the power lift member of the present invention.
FIG. 7 is a cross-sectional view showing one of four states of the power lift member of FIG. 6, showing the tool member in an open position.
FIG. 8 is a cross-sectional view showing another one of the four states of the power lift member of FIG. 6, showing the tool member at a closed position in a first closing stroke.
9 is a cross-sectional view showing another one of the four states of the power lift member of FIG.
3 shows the start state of the closing stroke of FIG.
FIG. 10 is a cross-sectional view showing the remaining one of the four states of the power lift member of FIG. 6, and shows a state in which a second closing stroke is completed.
FIG. 11 shows a side view of the power lift member in the cross section of FIG.
12 schematically shows one side of the cooperating element of the power lift member according to FIG. 6, corresponding to FIG.
FIG. 13 schematically shows one side of the cooperating element of the power lift member according to FIG. 6, corresponding to FIG. 9;
14 schematically shows one side of the cooperating element of the power lift member according to FIG. 6, corresponding to FIG.
DESCRIPTION OF SYMBOLS 1 Machine frame 2 Molding part 3 Deaeration sealing part 4 Cutting part 5 Film sheet 6 Container 7 Base 8 Upper tool member 9 Lower tool member 10 Guide rod 11 Cross member 12 Piston cylinder device 13 Cylinder 14 Piston rod 20 Second lift Member (power lift member) 21 Housing 22 Lift rod 23 Piston cylinder device 24 Cylinder 25 Piston 26 Surface 27 Opening 28 Seal 30 Sleeve 31 Inlet 32 Outlet 40 Top 50 Chamber 52 Opening 53 Second chamber 55 Gate type link 60 Free end 61 thrust member 61a, 61b plane 70a, 70b guide groove 71a, 71b plane 80 roller 90a, 90b plane 100 lever system 101a, 101b double lever 102a, 102b fulcrum 103a, 1 03b Pivot connection 104a, 104b Connection rod 105a, 105b Link point 106a, 106b Connection rod 107a, 107b Link point 108a, 108a Link point
1. A lifting device for a working unit of a packaging machine, wherein the working unit includes a first tool member and a second tool mounted to move with respect to the first tool member. A first lift member for performing a first closing stroke of the second tool member toward the first tool member, and a first lifting member for performing the first closing stroke. A second lift member for performing a subsequent second closing stroke, wherein the second lift member includes a driving unit and a substantial member for performing the second closing stroke when a resistance force is generated. And a mechanical transmission means for generating a constant closing force.
2. The lift device according to claim 1, wherein the mechanical transmission means has a roller disposed between a first plane, a second plane, and a third plane, The first plane is configured to move the roller between the second plane and the third plane to increase the distance between the second and third planes.
A lift device coupled to said drive means for displacing said first plane from a first position to a second position so as to movably contact said plane.
3. The lift device according to claim 2, wherein the first plane is connected to the driving unit, and the second plane is connected to a base of the working unit.
The lift device, wherein the third plane is connected to a member connected to the second tool member.
4. The lift device according to claim 3, wherein said driving means includes a piston cylinder device, and a member connected to said second tool member is configured to move in a direction of a lift stroke in said piston cylinder device. A lift device comprising a lift rod supported reciprocally on the lift device.
5. The lift device according to claim 4, wherein the second lift member is connected to a housing, a means for connecting the housing to the base of the working unit, and a piston of the piston cylinder device. A gate-type link having a guide groove for the roller, means for supporting the gate-type link so as to be movable downward and upward in the housing, and supporting the roller in the housing. A lift device comprising: a support unit.
6. The lift device according to claim 5, wherein the lift rod includes a free end and a thrust member disposed at the free end, wherein the thrust member extends obliquely with respect to the lift direction, and Having at least one plane defining a third plane, the support means for the roller also has at least one plane inclined with respect to the lift direction and defining the second plane. And a lift device, wherein both of said planes form a wedge angle therebetween.
7. The lift device according to claim 6, wherein the guide groove for the roller extends substantially perpendicular to the second plane defined by the plane of the support means. , Each of the guide grooves has an upper edge facing the piston of the piston cylinder device, and the upper edges of two guide grooves for guiding one of the rollers are the first edge. A lift device for defining a flat surface.
8. The lift device according to claim 7, wherein the guide groove, the second plane, and the third plane are arranged such that the roller is provided on the support portion by the displacement of the gate type link by the driving means. When the gate-type link is displaced in a direction opposite to the lift direction and is arranged to roll between a plane and the plane of the thrust member, thereby displacing the lift rod in the lift direction. In order to increase the distance between the plane of the thrust member and the plane of the support means by the force exerted on the thrust member by the roller, the roller of the gate type link is restricted while the roller is restricted. A lift device comprising means for guiding in a guide groove.
9. The lift device according to claim 8, wherein the lift rod extends centrally through the piston, and wherein the gate type link, the support means, and the lift rod include the piston. A lift device characterized by being symmetrical with respect to a cylinder axis of the cylinder device.
10. The lift device according to claim 1, wherein
A lift device comprising two pairs of rollers.
11. The lift device according to claim 2,
The force F1 generated by the drive means and consequently the force F acting on the second tool member during the second closing stroke
2. The lift device according to claim 1, wherein a power transmission ratio between the first and second planes is determined by a relative angle between the first, second, and third planes.
12. The lift device according to claim 11, wherein the relative angle has a value of the closing force that is two to three times larger than the force F1 generated by the driving means.
13. The lift device according to claim 12, wherein the value of the closing force is about ten times the force generated by the drive device.
14. The lift device according to claim 1, wherein
The first closing stroke extends over 200 mm and
Lifting device wherein the closing stroke is in a range between about 1 mm and about 10 mm.
15. The lift device according to claim 1, wherein
The lift device of claim 2, wherein the closing force by the second lift member is between about 25 kN and about 150 kN.
16. The lift device according to claim 1, wherein
The packaging machine includes a machine frame, and means for conveying a material web along the machine frame through the first tool member and the second tool member, wherein the lifting device comprises: And the lift device disposed between the second tool member and the machine frame and the machine frame for coupling the first tool member to the second tool member. Lever system so that when the second tool member is moved to the open position, the entire lifting device is lifted, thus moving the first tool member away from the material web. Features lift equipment.
17. A packaging machine comprising a machine frame and a working part mounted thereon, wherein the working part moves with respect to a first tool member and the first tool member. And a lift device for moving the second tool member, wherein the lift device is configured to perform a first closing of the second tool member toward the first tool member. A first lift member for performing a closing stroke; and a second lift member for performing a second closing stroke following the first closing stroke, wherein the second lift member includes: , A driving means, and a mechanical transmission means having means for generating a substantially constant closing force for the second closing stroke in the event of resistance. .
18. The packaging machine according to claim 17, wherein said mechanical transmission means comprises a first plane, a second plane substantially perpendicular to said first plane, and said second plane. A roller disposed between the second plane and a third plane that forms a wedge angle with respect to the first plane. The driving unit displaces the first plane to move the roller along the second and third planes. The first plane to move the third plane away from the second plane.
A packaging machine characterized in that it is connected to a flat surface.
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EP97113794.8 1997-08-08
JPH11147512A true JPH11147512A (en) 1999-06-02
JP3041606B2 JP3041606B2 (en) 2000-05-15
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