POUCH HANDLING MACHINE WITH RECIPROCATING BEAMS CONVEYOR

Abstract

A pouch handling machine comprises and a series of pouch related process stations. A reciprocating beams conveyor advances pouches intermittently along the stations. The conveyor comprises a left-hand side and a right-hand side elongated reciprocating beams, each provided along the length thereof with pouch retention members. A left-hand side and a right-hand side support member, each support reciprocating beams and form a linear guide of the reciprocating beams. A left-hand side and a right-hand side electromagnetic linear actuator are provided, each being mounted between the respective reciprocating beams and the respective support member to cause an intermittent reciprocating motion of the reciprocating beams in the longitudinal direction thereof. These actuators are linked to an electronic controller that is adapted to synchronize the motions of the actuators. A transverse motion mechanism causes a periodic transverse motion of the left-hand side and a right-hand side support members away from and towards one another.

Claims

1. A pouch handling machine (1) comprising a frame (2), multiple pouch related process stations (10-18) arranged on the frame in series, and a reciprocating beams conveyor (20) that is adapted to advance pouches (5) intermittently in a horizontal path along said series of multiple stations, wherein the reciprocating beams conveyor comprises: a left-hand side and a right-hand side elongated reciprocating beam (21,22), each of said reciprocating beams being provided at intervals along the length thereof with pouch retention members (23,24), a left-hand side and a right-hand side support member (27,28), each of said support members supporting and forming a linear guide for said left-hand side and right-hand side reciprocating beam (21,22) respectively, a longitudinal reciprocating motion drive mechanism adapted to cause an intermittent reciprocating motion of the reciprocating beams in the longitudinal direction thereof, a transverse motion mechanism (40-45, 47, 48) adapted to cause a periodic transverse motion of the left-hand side and a right-hand side support members (23,24) 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, characterized in that: the longitudinal reciprocating motion drive mechanism comprises a left-hand side and a right-hand side electromagnetic linear actuator (50,51), each of said electromagnetic linear actuators being mounted between the respective reciprocating beams (21,22) and the respective support member (27,28), and in that said electromagnetic linear actuators (50,51) are linked to an electronic controller (60) that is adapted to synchronize the motions of the electromagnetic linear actuators.

2. The pouch handling machine according to claim 1, wherein 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 said rod is longitudinally mobile and with one or more electrical coils in said block adapted to create a magnetic propulsion force in combination with said rod when the one or more coils are energized.

3. The pouch handling machine according to claim 2, wherein the block (53) is mounted to the respective support member (27,28) and wherein the rod (52) is secured, e.g. at both ends thereof, to the respective reciprocating beam (21,22).

4. The pouch handling machine according to claim 2, wherein the rod (52) is arranged parallel to the respective reciprocating beam (21,22).

5. The pouch handling machine according to claim 1, wherein the frame of the machine is provided with rectilinear transverse guide members (40,41), and wherein the support members (27,28) are mounted (42-45) on said transverse guide members such that the transverse motion mechanism (47,48) causes a periodic rectilinear transverse motion of the left-hand side and a right-hand side support members away from and towards one another.

6. The pouch handling machine according to claim 3, wherein the frame of the machine is provided with rectilinear transverse guide members (40,41), and wherein the support members (27,28) are mounted (42-45) on said transverse guide members such that the transverse motion mechanism (47,48) causes a periodic rectilinear transverse motion of the left-hand side and a right-hand side support members away from and towards one another.

7. The pouch handling machine according to claim 4, wherein the frame of the machine is provided with rectilinear transverse guide members (40,41), and wherein the support members (27,28) are mounted (42-45) on said transverse guide members such that the transverse motion mechanism (47,48) causes a periodic rectilinear transverse motion of the left-hand side and a right-hand side support members away from and towards one another.

8. The pouch handling machine according to claim 1, wherein said pouch process stations comprises one or more of: a sterilization station; a filling station (12,13); a spout placement station (15); a spout sealing station (15,16,17); a pouch sealing station; and a spout capping station.

9. The pouch handling machine according to claim 6, wherein said pouch process stations comprises one or more of: a sterilization station; a filling station (12,13); a spout placement station (15); a spout sealing station (15,16,17); a pouch sealing station; and a spout capping station.

10. The pouch handling machine according to claim 1, wherein said pouch process stations comprises a liquid filling station (12,13) adapted to fill the pouches (5) with a liquid.

11. The pouch handling machine according to claim 9, wherein said pouch process stations comprises a liquid filling station (12,13) adapted to fill the pouches (5) with a liquid.

12. The pouch handling machine according to claim 1, wherein the machine comprises upstream of the reciprocating beams conveyor a pouch making installation adapted to make individual pouches from heat-sealable film, said individual pouches being transferred at a transfer point to the reciprocating beams conveyor of the machine.

13. The pouch handling machine according to claim 10, wherein the machine comprises upstream of the reciprocating beams conveyor a pouch making installation adapted to make individual pouches from heat-sealable film, said individual pouches being transferred at a transfer point to the reciprocating beams conveyor of the machine.

14. The pouch handling machine according to claim 1, wherein 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, e.g. wherein the data set comprises a profile of linear speed and/or acceleration of the electromagnetic linear actuator as well as stop positions of the electromagnetic linear actuator.

15. Pouch handling machine according to claim 12, wherein 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, e.g. wherein the data set comprises a profile of linear speed and/or acceleration of the electromagnetic linear actuator as well as stop positions of the electromagnetic linear actuator.

16. A pouch handling machine according to claim 14, wherein the machine comprises an operator selector device, e.g. a touchscreen (80), configured to allow a machine operator to select a pouch type, and wherein the controller (60) is configured to select a data set in stored in said memory (70) on the basis of the pouch type selection and to control the reciprocating beams conveyor accordingly.

17. A pouch handling machine according to claim 14, wherein the machine comprises a display, e.g. a touchscreen (80), and wherein 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.

18. A pouch handling machine according to claim 16, wherein the machine comprises a display, e.g. a touchscreen (80), and wherein 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.

19. A method for handling pouches (5), e.g. filling and sealing pouches, e.g. with a liquid, wherein use is made of a pouch handling machine according (1) to one or more of the preceding claims.

20. Method according to claim 19, wherein 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 is stored at least representing an actuator motion profile to be performed by each of the actuators when handling the corresponding pouch type, e.g. wherein the data set comprises a profile of linear speed and/or acceleration of the electromagnetic linear actuator as well as stop positions of the electromagnetic linear actuator.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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:

[0044] FIG. 1 shows the frame, reciprocating beams conveyor, and stations of a pouch handling machine according to the invention in a perspective view;

[0045] FIG. 2 shows the machine of FIG. 1 in a front view;

[0046] FIG. 3 shows the reciprocating beams conveyor and stations of FIG. 1 from above;

[0047] FIG. 4 shows the reciprocating beams conveyor and stations of FIG. 1 from below;

[0048] FIG. 5 shows the leading end of the conveyor of the machine of FIG. 1;

[0049] FIG. 6 shows exemplary graphs of longitudinal position, speed, and accelerations of the reciprocating beams as obtained by a drive of the type as discussed in ES 1 040 575;

[0050] FIG. 7 shows exemplary graphs of longitudinal position, speed, and accelerations of the reciprocating beams as obtainable by a drive according to the invention;

[0051] With reference to FIGS. 1-5 now an example of a pouch handling machine 1 according to the invention will be described. However, it is to be noted that the drawings illustrate a few exemplary embodiments of the present inventive concept, and are not to be considered limiting in its scope, as the overall inventive concept may admit to other equally effective embodiments. The elements and features shown in the drawings are to scale and attempt to clearly illustrate the principles of exemplary embodiments of the present inventive concept. In the drawings, reference numerals designate like or corresponding, but not necessarily identical, elements throughout the several views.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] Hereinafter, one or more exemplary embodiments of the present general inventive concept will be described in detail with reference to accompanying drawings.

[0058] Exemplary embodiments of the present general inventive concept are directed to a

[0059] 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.

[0060] 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.

[0061] 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.

[0062] The stations 10-18 each are configured to perform a step of an entire production cycle.

[0063] 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.

[0064] Herein, for example, station 11 further opens the pouch top by inserting an opener member into the somewhat opened pouch.

[0065] 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.

[0066] 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.

[0067] Herein, for example, station 14 somewhat stretches the top end of the pouch.

[0068] 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

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] As explained herein the number of stations, their functionality, and design may all differ depending on the processing cycle that is desired.

[0074] The conveyor 20 has a left-hand side elongated reciprocating beam 21 and a right-hand side elongated reciprocating beam 22.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] As can be seen e.g. in FIGS. 3, 4 a transverse motion drive of the machine 1 is provided that is configured to cause a periodic rectilinear transverse motion of the left-hand side and a right-hand side support members away from and towards one another. Here, as an example, a drive link 47 connects to the left-hand slider and a drive link 48 connects to the right-hand slider, with the drive links being connected to a motorized drive (not shown) that causes the links 47, 48 to be driven in order for the beams 21, 22 to be moved towards and away from one another in order to clamp a pouch 5 between opposed pouch retention members 23, 24 of the left-hand and right-hand reciprocating beams 21, 22 and to release a pouch 5.

[0083] 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.

[0084] 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.

[0085] Each of these electromagnetic linear actuators 50, 51 is mounted between the respective reciprocating beam 21, 22 and the respective support member 27,28.

[0086] 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.

[0087] 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.

[0088] In embodiments one or more bearings for the rod 52 are provided in the block 53.

[0089] 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.

[0090] A cable connects to the actuator 50, 51 to feed electricity and control signals to the actuator.

[0091] The actuators 50, 51 preferably are integrated in a servo control system.

[0092] 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.

[0093] 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

[0094] 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.

[0095] The inventive drive is highly advantageous over the prior art design, which can for instance be appreciated from a discussion with reference to FIGS. 6 and 7.

[0096] Herein FIG. 6 shows exemplary graphs of longitudinal position, speed, and accelerations of the reciprocating beams as obtained by a drive of the type discussed in ES 1 040 575, whereas FIG. 7 shows exemplary graphs of longitudinal position, speed, and accelerations of the reciprocating beams as obtained by a drive according to the invention.

[0097] 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.

[0098] The FIG. 7, which is merely an example as the motions of the electromagnetic linear actuators 50, 51 are basically freely programmable, evidences already that the return motion can be completely different from the forward motion. So, as shown, the forward motion can be controlled to be gentle, with limited changes in speed and thus reduced or limited accelerations and/or decelerations, whereas the return motion can be very rapid with high accelerations and/or decelerations. For example, the return motion can comprise accelerations of above 100 mm/s2. It will thus be appreciated that the overall speed of the machine can be increased, even when handling open topped pouches filled with a watery liquid, by optimizing the return motion for speed whilst optimizing the forward motion for gentle handling. Also, if desired, a prolonged period of standstill can be programmed, as illustrated in FIG. 7.

[0099] 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

[0100] 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.