Patent Application
20200223575
Not applicable.
A portion of this disclosure contains material which is subject to copyright protection. The copyright owner has no objection to the photocopy reproduction by anyone of the patent document or the patent disclosure in exactly the form it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all copyright rights whatsoever. 37 C.F.R. 1.71(d).
The present invention relates to a pouch handling machine comprising a frame, multiple pouch related process stations arranged in series on the frame, and a reciprocating beams conveyor that is adapted to advance pouches intermittently in a horizontal path along said series of multiple stations. In the field of pouch handling machinery this type of conveyor is also referred to as a walking beam conveyor.
In the field of pouch handling machinery, a reciprocating beams conveyor is a well-known and often implemented mechanism to obtain a step by step motion of the pouches from one station to the next. For example, open topped pouches are opened at a first station, filled at a second station, e.g. with a liquid, and then moved to a third station wherein a spout with cap thereon is sealed into the open top so that the pouch is closed. In another known arrangement an open topped pouch is first opened at a first station, a non-capped spout is sealed into the top of the pouch at a second station, the pouch is filled through the spout at a third station, and a capping station places a cap on the spout in a fourth station.
Generally, in a reciprocating beams conveyor there are a left-hand side and a right-hand side elongated beam. Each of these reciprocating beams is provided at intervals along the length thereof with one or more pouch retention members, for example a pair of pouch gripping studs of which the longitudinal position along the reciprocating beam is adjustable to adapt the conveyor to the dimensions of the pouch to be conveyed. In some designs pouches are advanced one by one, in another known design pouches are advanced in sets, e.g. in pairs or three or four, from station to station, with the stations being adapted to handle the set of pouches.
The reciprocating beams are supported respectively by a left-hand side and a right-hand side support member. The guide members form a linear guide for the respective reciprocating beam. A longitudinal reciprocating motion drive mechanism of the machine causes an intermittent reciprocating motion of the reciprocating beams in the longitudinal direction thereof, whilst a transverse motion mechanism cause a periodic transverse motion of the left-hand side and a right-hand side support members towards and away from one another in order to clamp a pouch between opposed pouch retention members of the left-hand and right-hand reciprocating beams and to release a pouch. This operation is well-known to the skilled person. The stations are equipped with further pouch retainer mechanisms to hold the pouch or pouches during the treatment at the respective station.
In a known arrangement of the longitudinal reciprocating motion drive mechanism a horizontal shaft journalled to the frame perpendicular to the path of the conveyor is driven by a motor to perform an angular back and forth rocking motion about its axis. This shaft is provided with one or two rocker arms that extend radially from the shaft. A left-hand and a right-hand linkage rod are provided. Each linkage rod is hinged to an end of the respective reciprocating beam at one end of the linkage rod and to the rocker arm at the other end. An example thereof is schematically shown in ES 1 040 575.
Further, the document US 2017/152067 discloses a packaging machine that includes a linear type conveyance unit conveying a bag linearly in a first direction and a rotary type conveying the bag rotationally in a second direction, wherein the linear type conveyance unit includes a first supporting unit moving from a first conveyance position to a second conveyance position while supporting the base in a suspended state and a second supporting unit which receives the bag from the first supporting unit at the second conveyance position and supports the bag in a suspended state.
Furthermore, DE 10 2004 056691 refers to stacked articles relocating device and has guide designed as fixed part of electromagnetic learn drive and attachment connected with movable part of linear drive and relocated along fixed part where a cylinder forms the attachment.
It is an object of the present invention to provide an improved pouch handling machine with a reciprocating beams conveyor.
It is a further object of the invention to provide an improved handling machine of the type wherein open topped pouches are filled at one station with liquid and then the pouch is sealed at a later, downstream station. For example, it is desired to increase the speed of the machine, so that more pouches can be filled and handled per hour.
It is a further object of the invention to provide an improved pouch handling machine in view of the increase variety of pouch dimensions and shapes.
The present general inventive concept achieves one or more of the above goals by providing a pouch handling machine comprising a frame, multiple pouch related process stations arranged on the frame in series, and a reciprocating beams conveyor that is adapted to advance pouches intermittently in a horizontal path along the series of multiple stations, wherein the reciprocating beams conveyor comprises:
This arrangement allows for many advantages over prior art reciprocating beams pouch conveyors. For example, the linear speed of the reciprocating beams in their longitudinal direction can be controlled accurately and more importantly acceleration from a stop position and braking when arriving at a stop position can be controlled. This allows for optimization of speed of the machine per hour in view of desired accuracy of the alignment of the pouch with the various stations. Furthermore, the forward speed of the reciprocating beams is now fully independent from the rearward or return motion speed of the reciprocating beams, which for example allows for a very rapid return motion whilst at the same time avoiding undue accelerations and declarations that may cause undue strains on the machine parts involved. A rapid return may be used to achieve an increase of overall hourly speed of the machine, or the time gain may be used to have a relatively slow forward motion, for example in order to handle low viscosity, e.g. watery, liquid filled into open topped pouches without sloshing causing spillage or the risk thereof before the pouch has been sealed.
The electromagnetic linear actuators are each arranged between the support member and the reciprocating beams, and synchronicity is achieved in electronic manner. This allows for optimized use of the potential of these actuators, e.g. in view of accuracy, speed, acceleration and deceleration. For example, due to the specific location of the actuators it is generally only the inertia of the reciprocating beams that the actuators need to handle as no intermediate mechanical transmission parts are required between the linear actuator and the reciprocating beams.
It will be appreciated that the electromagnetic linear actuators are preferably controlled on the basis of some servo control system.
In an embodiment the electromagnetic linear actuators are of the tubular linear motor type with a rod wherein an array of magnets is housed and with a block through which the rod is longitudinally mobile and with one or more electrical coils in the block being adapted to create a magnetic propulsion force in combination with the rod when the one or more coils are energized. In the art, the block is also often referred to as the “forcer”. This design is advantageous in a pouch handling machine, for example in view of handling of food stuffs to be filled into the pouches, which application requires regular cleaning of the machine.
Preferably the rod is of stainless steel material.
In an embodiment the block is mounted to the respective support member and the rod is secured, e.g. at both ends thereof, to the respective reciprocating beams. This allows for easy connection of the block via one or more electrical lines to the controller as the block does not move in the longitudinal direction as does the rod and the reciprocating beam.
It will be appreciated that in an optimum design the rod of the actuator is arranged parallel to the respective reciprocating beam, e.g. in an embodiment wherein both ends of the rod are secured to the reciprocating beam.
In an embodiment the frame of the machine is provided with rectilinear transverse guide members and the support members are mounted on these transverse guide members such that the transverse motion mechanism causes a periodic rectilinear transverse motion of the left-hand side and a right-hand side support members away from and towards one another. It is noted that other motion mechanisms for the support members are also possible, yet less preferred, e.g. with the support members having lower ends that are pivoted about a horizontal axis to achieve the motion of the reciprocating beams away and towards one another.
In an embodiment the pouch process stations comprises one or more of:
As explained herein the innovative reciprocating beams conveyor is in particular suited for machines wherein the filling station is a liquid filling station, so embodied to fill the pouch with a liquid, in particular to fill an open topped pouch with a liquid.
As explained the electromagnetic linear actuators allow for accurate control of the motion of the pouch, and this allows to avoid sloshing and related spillage of liquid via the open top whilst at the same time a high hourly processing speed of the machine can be achieved. Therefore, a preferred embodiment of the machine according to the invention is provided with a liquid filling station adapted for filling liquid into an open topped pouch and with a sealing station downstream thereof along the reciprocating beams conveyor. The sealing may be a direct seal between the film walls of the pouch, or the sealing of a spout into the open top, e.g. a spout that has already been provided with a cap or other closure.
In an embodiment the machine comprises upstream of the reciprocating beams conveyor a pouch making installation adapted to make individual pouches from heat-sealable film. Such installations are well-known in the art. These individual pouches are then transferred at a transfer point to the reciprocating beams conveyor of the machine.
For example, the machine is provided with a device for vertically forming a tubular body of heat sealable film material, making horizontal welds at intervals across the tubular body, and cutting the welded tubular body by horizontal cuts into open topped pouches that are then transferred to the horizontally arranged reciprocating beams conveyor for further pouch related processing at various stations along the conveyor. For example, the machine is structured as disclosed in US2017/0096247.
In an embodiment the controller of the electromagnetic linear actuators is provided with a memory wherein, for each of multiple pouch types a respective data set at least representing an actuator motion profile to be performed by the linear electromagnetic actuators of the beams when handling the pouch type. The data set may comprise a profile of speed and/or acceleration of the electromagnetic linear actuators as well as stop positions of the actuators.
The machine may comprise an operator selector device, e.g. a touchscreen, allowing a machine operator to select the appropriate pouch type upon which the controller will select the appropriate actuator motion profile data set from the memory and control the reciprocating beams conveyor accordingly.
The machine may comprise a display, e.g. a touchscreen, and be embodied to display thereon the selected actuator motion profile in graphical form, e.g. as a graph or graphs representing speed and/or acceleration/deceleration in relation to longitudinal position of the reciprocating beams.
The present invention also relates to a method for handling of pouches wherein use is made of a machine as disclosed herein.
For example, the invention allows for a method comprising the step of selecting a pouch type, e.g. on a touchscreen, by an operator, wherein the controller selects on the basis thereof a respective actuator motion profile data set from a memory and controls the reciprocating beams conveyor accordingly
Additional features and utilities of the present general inventive concept will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the general inventive concept.
These and/or other features and utilities of the present inventive concept will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
With reference to
Reference will now be made in detail to the embodiments of the present general inventive concept, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present general inventive concept while referring to the figures. Also, while describing the present general inventive concept, detailed descriptions about related well-known functions or configurations that may diminish the clarity of the points of the present general inventive concept are omitted.
It will be understood that although the terms “first” and “second” are used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Thus, a first element could be termed a second element, and similarly, a second element may be termed a first element without departing from the teachings of this disclosure.
Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.
All terms including descriptive or technical terms which are used herein should be construed as having meanings that are obvious to one of ordinary skill in the art. However, the terms may have different meanings according to an intention of one of ordinary skill in the art, case precedents, or the appearance of new technologies. Also, some terms may be arbitrarily selected by the applicant, and in this case, the meaning of the selected terms will be described in detail in the detailed description of the invention. Thus, the terms used herein have to be defined based on the meaning of the terms together with the description throughout the specification.
Also, when a part “includes” or “comprises” an element, unless there is a particular description contrary thereto, the part can further include other elements, not excluding the other elements. In the following description, terms such as “unit” and “module” indicate a unit to process at least one function or operation, wherein the unit and the block may be embodied as hardware or software or embodied by combining hardware and software.
Hereinafter, one or more exemplary embodiments of the present general inventive concept will be described in detail with reference to accompanying drawings.
Exemplary embodiments of the present general inventive concept are directed to a
The figures only show the parts of interest of a machine 1 according to an exemplary embodiment of the present inventive concept. For instance, the machine 1 may also comprise a pouch making installation that is adapted to make individual pouches from heat-sealable film. These individual pouches can then be transferred at a transfer point to reciprocating beams conveyor 20 of the machinel, as shown.
For example, the machine 1 is provided with a device for vertically forming a tubular body of heat sealable film material, making horizontal welds at intervals across the tubular body, and cutting the welded tubular body by horizontal cuts into open topped pouches that are then transferred to the horizontally arranged reciprocating beams conveyor for further pouch related processing at various stations along the conveyor. For example, the machine is structured as disclosed in US2017/0096247.
Generally, the machine 1 comprises a frame 2 that supports multiple pouch related process stations 10-18 arranged on the frame 2 in series along a horizontal path.
The stations 10-18 each are configured to perform a step of an entire production cycle.
Herein, for example, station 10 opens the top end of a pre-made pouch 5 by moving the vertical side edges near the open top closer together.
Herein, for example, station 11 further opens the pouch top by inserting an opener member into the somewhat opened pouch.
Herein, for example, station 12 fills a first volume of a liquid in the opened pouch, e.g. having a filling nozzle introduced into the open top.
Herein, for example, station 13 fills a second and final volume into the opened pouch, e.g. at a lower flow rate than the station 12.
Herein, for example, station 14 somewhat stretches the top end of the pouch.
Herein, for example, station 15 introduces a capped plastic spout into the open top and performs a first sealing step to adhere the spout to the pouch
Herein, for example, stations 16, 17 perform further heat sealing steps to seal the spout to the pouch and completely close the top of the pouch.
Herein, for example, station 18 forms a discharge station where the filled and closed pouches 5 are dropped, e.g. onto chute 19 below the discharge end of the conveyor 20.
An inventive reciprocating beams conveyor 20 is provided, which is adapted to advance pouches 5 intermittently in the horizontal path along the series of multiple stations 10-18.
In generally it is assumed in this example that open topped individual pouches 5 are fed to the entry or take-up side of the conveyor 20. These pouches 5 are then to be opened to allow for access of a filling nozzle of a filling station, here a liquid filling station that fills a liquid, into the pouch. The still open topped pouch is then conveyed onwards to further stations that seal or close the pouch. Here the machine comprises a station to place a capped plastic spout into the open top of the pouch, which spout in then heat-sealed in multiple steps at stations 15,16,17. The then filled and sealed pouch is dropped from the conveyor 20 at discharge station 18 onto a chute device 19.
As explained herein the number of stations, their functionality, and design may all differ depending on the processing cycle that is desired.
The conveyor 20 has a left-hand side elongated reciprocating beam 21 and a right-hand side elongated reciprocating beam 22.
Each of these reciprocating beams 21, 22 is provided at intervals along the length thereof with pouch retention members 23, 24, in fact pairs of members 23, 24 as they are configured to clamp between them the opposite vertical side edges of the open topped pouches in this example.
As shown here, in an embodiment, each retention member 23, 24 is a stub or finger that projects from the respective beam 21, 22 towards the other beam, and as preferred a resilient tip member (see at 24) is provided on one or more of them to clamp the pouch in appropriate manner.
These pouch retention members 23, 24 are mounted on the respective beam 21, 22 in an adjustable manner, at least (as preferred) adjustable in longitudinal direction of the beam 21, 22. This allows to set the position of the pouch retention members 23, 24 in accordance with the type of pouch 5 to be handled, e.g. in according to the width of the pouch 5 at the location where the pouch retention members clamp the side edges. As shown the beams 21, 22 may comprise indicia, e.g. a ruler as here, to indicate the position of each pouch retention member.
The conveyor further comprises a left-hand side support member 27 and a right-hand side support member 28. Each of these support members 27, 28 supports a respective left-hand side and right-hand side reciprocating beam 21, 22. Also they each form a rectilinear guide for the respective beam 21, 22, parallel to one another and in a horizontal plane.
In the embodiment shown here each support member 27, 28 is provided with a V-profiled side edges rail 29 and corresponding rollers 30 that provide a rectilinear guidance of the beam relative to the support member 27, 28.
Before discussing the longitudinal reciprocating motion drive mechanism that is adapted to cause an intermittent reciprocating motion of the reciprocating beams in the longitudinal direction thereof, the transverse motion mechanism will be discussed here.
The frame 2 of the machine 1 is provided with rectilinear transverse guide members 40, 41, here one at the entry side of the conveyor 20 and one at the discharge side of the conveyor. In the depicted example each of these rectilinear transverse guide members 40, 41 has a pair of parallel horizontally arranged guide rods. On each pair of rods 40, 41 a pair of sliders 42, 43, 44, 45 is mounted so that these sliders 42, 43, 44, 45 can slide horizontally. The left-hand sliders 42, 44 are fitted to the left-hand support member 27 and the right-hand sliders 43, 45 to the right-hand support member 28, so that these members 27, 28 are guided to perform a rectilinear transverse motion of the left-hand side and a right-hand side support members away from and towards one another.
As can be seen e.g. in
Generally, as the beams 21, 22 reach a forward stop position, pouch retention mechanisms associated with the various stations 10-17 take hold of the pouch(es) fed to the station, allowing the beams 21, 22 to be moved apart so that the pouches are released from the conveyor 20. Then the beams 21, 22 are returned to their rearward stop position, where the beams 21, 22 are being moved back towards one another to clamp the pouches 5 that are then released from the pouch retention arrangements associated with the various stations. The beams 21, 22, then advance the pouches 5 one step further along the path to the next station, and at the entry side of the conveyor 20 a new pouch is picked up and at the discharge side a pouch is discharged.
In order to obtain an intermittent reciprocating motion of the reciprocating beams 21, 22 in the longitudinal direction thereof the longitudinal reciprocating motion drive mechanism comprises a left-hand side electromagnetic linear actuator 50 and a right-hand side electromagnetic linear actuator 51.
Each of these electromagnetic linear actuators 50, 51 is mounted between the respective reciprocating beam 21, 22 and the respective support member 27,28.
These electromagnetic linear actuators 50, 51 are linked to an electronic controller 60 that is adapted to synchronize the motions of the electromagnetic linear actuators 50, 51 and thus of the longitudinal motion of the beams 21, 22.
As shown here the electromagnetic linear actuators 50, 51 are of the tubular linear motor type with a rod 52 wherein an array of magnets is housed and with a block 53 through which the rod is longitudinally mobile. In the block, or forcer, 53 there are one or more electrical coils allowing to create a magnetic propulsion force in combination with the rod 52 when the one or more coils are energized. In the block 53 there is also a position sensor to sense the position of the rod 52 relative to the block 53. As preferred the position sensor monitors the position of the rod 52 on a continuous basis, so both during standstill and motion, e.g. as part of a servo control of the actuator.
In embodiments one or more bearings for the rod 52 are provided in the block 53.
As shown the block 53 is mounted to the respective support member 27, 28 and the rod 52 is secured, at both ends thereof, to the respective reciprocating beam 21, 22. The rod 52 is arranged parallel to the respective reciprocating beam 21, 22.
A cable connects to the actuator 50, 51 to feed electricity and control signals to the actuator.
The actuators 50, 51 preferably are integrated in a servo control system.
The controller 60 of the electromagnetic linear actuators 50, 51 is provided with a memory 70 wherein, for each of multiple pouch types a respective data set at least representing an actuator motion profile to be performed by each of the actuators 50, 51 when handling the corresponding pouch type. For example, each data set comprises a profile of linear speed and/or acceleration of the electromagnetic linear actuator 50, 51 as well as stop positions of the electromagnetic linear actuator. Preferably the data set also contains data representing the transverse motions of the beams 21, 22 governed by the transverse motion drive.
The machine comprises an operator selector device, e.g. a touchscreen 80, configured to allow a machine operator to select a pouch type, e.g. from a list displayed on the screen 80. The controller 60 is configured to select a data set that has been stored in the memory 70 on the basis of the pouch type selection and to control the reciprocating beams conveyor accordingly
In an embodiment the machine comprises a display, e.g. a touchscreen, and the controller is configured to display thereon a selected actuator motion profile in graphical form, e.g. as a graph or graphs representing speed and/or acceleration/deceleration in relation to longitudinal position of the reciprocating beams.
The inventive drive is highly advantageous over the prior art design, which can for instance be appreciated from a discussion with reference to
Herein
The prior art mechanical rocker arm and linkage rods drive causes basically a symmetrical speed and accelerations profile for the longitudinal forward and return motions. An increase of overall hourly speed of such a prior art machine, will inevitably result in increased accelerations during the forward motion. As explained, for example when handling an open topped pouch that has been filled with liquid at a filling station, increase increased accelerations and/or decelerations may lead to undue sloshing of the liquid and possible spillage. The latter is of course highly undesirable, not only due to soiling of the machine but also inaccuracy of the filled volume and/or problems associated with heat sealing the pouch and/or sealing a spout into the open top. Also, it can be seen that the periods wherein the beams are more or less at standstill are very brief.
The
Clearly a problem like sloshing of a watery liquid in the pouch, or some other liquid product, may also depend on the type of pouch to be handled, the filling level, etc. Therefore, the provision of a memory with predefined data sets for the controller 60 that controls the actuators 50, 51 may be very advantageous as it will allow an operator to quickly choose the correct settings for the production run on the machine
Although a few embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the appended claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| P201700673 | Jul 2017 | ES | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IB2017/055890 | 9/27/2017 | WO | 00 |
