US20130318919A1 - Tool lift mechanism - Google Patents

Tool lift mechanism Download PDF

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Publication number
US20130318919A1
US20130318919A1 US13/877,657 US201113877657A US2013318919A1 US 20130318919 A1 US20130318919 A1 US 20130318919A1 US 201113877657 A US201113877657 A US 201113877657A US 2013318919 A1 US2013318919 A1 US 2013318919A1
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US
United States
Prior art keywords
lifting
tool half
lower tool
compressive force
lifting apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/877,657
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English (en)
Inventor
Graham Andrew Charles Neale
Lee Michael Vine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ishida Europe Ltd
Original Assignee
Ishida Europe Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ishida Europe Ltd filed Critical Ishida Europe Ltd
Assigned to ISHIDA EUROPE LIMITED reassignment ISHIDA EUROPE LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NEALE, GRAHAM ANDREW CHARLES, VINE, LEE MICHAEL
Publication of US20130318919A1 publication Critical patent/US20130318919A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B65B31/02—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas
    • B65B31/025—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas specially adapted for rigid or semi-rigid containers
    • B65B31/028—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas specially adapted for rigid or semi-rigid containers closed by a lid sealed to the upper rim of the container, e.g. tray-like container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
    • B65B7/162—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by feeding web material to securing means
    • B65B7/164—Securing by heat-sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B65B31/02—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas
    • B65B31/021—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas the containers or wrappers being interconnected

Definitions

  • the invention relates to a lifting apparatus, particularly in the context of a tray sealing machine.
  • tray means any container having an upwardly facing opening to which a film is to be heat sealed.
  • tray sealing machine In the food industry, it is common to package food items in heat sealed trays. Conventionally, trays are transported along a conveyer and filled with the desired food items. The tray is then fed, typically with a plurality of other trays, to a tray sealing machine.
  • the tray sealing machine typically comprises a lower tool half on which the tray(s) is positioned, and an upper tool half.
  • the lower tool half is lifted towards the upper tool half via a lifting mechanism, and the upper and lower tool halves are clamped together to generate an air tight seal.
  • the lower tool half has an ejector plate which lowers the trays into a recess as the lower tool half is lifted towards the upper tool half. The sealing process can then take place.
  • Lifting mechanisms using a motor-driven spindle to lift the lower tool half are known in the art.
  • a large force is placed on the lifting spindle, much larger than the load placed on the spindle during lifting of the lower tool half.
  • This large force placed on the lifting spindle could cause it to buckle, having serious consequences not only for the output of the tray sealing machine, but also for safety.
  • a large high power electromechanical brake may be used to reduce the forces experienced by the spindle.
  • this also increases cost due to the increased complexity and power consumption.
  • What is needed in the art is a lifting mechanism for a tray sealing machine that prevents the problem of the lifting mechanism buckling or being damaged under the high loads caused by the sealing process, without compromising on the efficiency, speed and cost of the tray sealing machine.
  • US2009/0288365 discloses a packaging machine having a lifting unit.
  • the lifting unit has preferably two spindles, each attached to a lifting plate by a spindle bearing.
  • Two guiding rods are also mounted on each lifting plate, which are connected at their upper end to a lower tool half.
  • brakes independently mounted to each guiding rod are actuated, thus avoiding undesired lowering of the lifting unit during operation.
  • the lifting plates are mounted via the spindle bearings, the spindles are kept stationary, and are thus exclusively stressed by tension, excluding the risk of buckling.
  • a lifting apparatus comprising; a first member and a second member; a lifting mechanism coupled to said first member adapted to move said first member towards said second member; a third member coupled to said first member and slideably moveable through said second member when said first member is moved towards said second member, and a latching mechanism wherein; when a predetermined compressive force is applied to said third member, the latching mechanism responds by latching said second member to said third member, such that when a further compressive force is applied to said third member, said first member and lifting mechanism are isolated from said further compressive force.
  • a key advantage of this invention is that when the further compressive force is applied to the third member, this force is transferred through the latching mechanism to the second member. This isolates the first member and, importantly, the lifting mechanism, from said further compressive force. This means that the lifting mechanism does not have to be specifically designed to take into account the further force, making manufacture simpler, and reducing the amount of material required.
  • the latching mechanism advantageously latches the second member to the third member automatically on application of the predetermined compressive force.
  • Other automatic latching mechanisms are envisaged.
  • a pressure sensor could be used to detect when the lower and upper tool halves are in contact, and an electronic system used to initiate the latches.
  • the automatic nature of the latching mechanism allows the lifting mechanism of the present invention to be used without supervision.
  • the latching mechanism comprises a spring mounted between said third member and said first member wherein in use said spring is compressed on application of said compressive force to said third member, and said predetermined compressive force corresponds to a predetermined point in the spring's compression.
  • a compressible fluid could be used instead of a spring.
  • the latching mechanism comprises a latch cam plate having a shaped portion, said latch cam plate fixedly coupled to said first member, and wherein the movement of said first member towards said second member causes said shaped portion to guide a latch so as the latch engages with a protruding potion on said third member.
  • Other latching mechanisms are envisaged, for example electromagnetically actuated latches.
  • the first member is a plate and said third member is elongate and coupled to said first member so as to project along the direction of movement of said first member.
  • the lifting mechanism is a rotateable lifting screw coupled to the first member in such a manner that rotation of said lifting screw causes movement of said first member in a plane substantially perpendicular to the rotation axis of said lifting screw.
  • the first member may be moved towards the third member by means of pistons or a pulley system.
  • the lifting apparatus further comprises one or more third members.
  • a second third member is also coupled to said first member via a spring, and is slideably movable through a second member.
  • the second third member provides increased support for an item to be lifted by the lifting apparatus, where the item is supported by the third members.
  • the lifting screw and the or each third member are substantially parallel.
  • the lifting apparatus may be included in a tool lift apparatus, the tool lift apparatus further comprising a lower tool half mounted to the distal end of the or each third member such that, in use, movement of the first member moves said lower tool half towards an upper tool half, and wherein said predetermined compressive force is due to said lower tool half and said upper tool half contacting.
  • the tool lift apparatus is employed in a tray sealing machine, where the further compressive force is due to a sealing process taking place when the upper and lower tool halves are in contact and form an air-tight seal.
  • the lifting apparatus may be employed in other instances apart from tray sealing machines, such as thermoformer machines and press tooling.
  • such a tool lift apparatus further comprises a second lifting apparatus, wherein said lower tool half is mounted to the distal end of the or each third member of the first and second lifting apparatuses, and further wherein the first and second lifting apparatuses are operated in synchrony.
  • the lower tool half of such an embodiment thus advantageously has greater support as it is supported by two lifting apparatuses.
  • a tool lift apparatus may be utilised in a single lane tray sealing machine.
  • the tool lift apparatus further comprises a second lifting apparatus and a second lower tool half mounted to the distal end of the or each third member of said second lifting apparatus, and wherein said first and second lifting apparatuses are operated independently. There may also be an independent upper tool half corresponding to the second lower tool half.
  • This embodiment provides increased flexibility in the use of the tool lift apparatus, especially when used in a dual lane tray sealing machine for instance. For example, one lane may be used for large trays that are sealed three at a time, and the second lane used to seal small trays that are sealed four at a time and at a faster rate.
  • the independent lifting apparatuses and tool halves allow for maximum flexibility in such a situation, increasing throughput and efficiency of the tray sealing machine.
  • FIG. 1 is a schematic side view partly in section of a lifting apparatus according to an embodiment of the present invention with a lifting plate in a lower position;
  • FIG. 2 is a view similar to FIG. 1 , but showing the lifting plate in an upper position;
  • FIG. 3 is a view of a lifting apparatus of the present invention in use in a single lane tray sealing machine
  • FIG. 4 is a view of a lifting apparatus of the present invention in use in a dual lane tray sealing machine
  • FIG. 5 a is a staggered cross-section of the lifting apparatus of FIGS. 1 and 2 , showing the latching mechanism in more detail;
  • FIG. 5 b is another staggered cross-section of the lifting apparatus of FIGS. 1 and 2 , showing the latching mechanism in more detail;
  • FIG. 6 a is another staggered cross-section of the lifting apparatus of FIGS. 1 and 2 , showing the latching mechanism in more detail;
  • FIG. 6 b is a further staggered cross-section of the lifting apparatus according to FIGS. 1 and 2 , showing the latching mechanism in more detail.
  • FIG. 1 there is shown a lifting apparatus comprising two pillars 1 a , 1 b attached to a lifting plate 7 .
  • each pillar 1 is slideably moveable through a housing structure 9 surrounding said pillar, and each housing structure 9 is mounted on a stationary upper plate 11 .
  • Other means of mounting the housing structures are envisaged.
  • the pillars may be circular or square in cross-section. Other cross-sectional shapes may be used.
  • the lifting plate 7 is raised towards the upper plate 11 by means of a lifting screw 2 rotateably mounted via bearings 2 a in the upper plate 11 and received in a screw threaded bush 2 b in the lifting plate 7 .
  • a gear 3 b is fixed to the upper end of the screw and is connected to a motor 3 by tooth belt 3 a .
  • the lifting screw 2 is rotated by said motor 3 , causing the lifting plate 7 to move upwards towards plate 11 in a plane substantially perpendicular to the axis of rotation.
  • FIGS. 1 and 2 show the lifting screw 2 located between the two pillars 1 a , 1 b , with the pillars and lifting screw substantially parallel, this is not necessarily the case.
  • the lifting apparatus of the present invention may contain any number of pillars.
  • the lifting plate 7 is moved relative to the lifting screw 2 .
  • Other means of raising the lifting plate 7 are envisaged, for example hydraulic pillars mounted beneath the plate in order to push it upwards towards upper plate 11 .
  • the lifting apparatus as depicted in FIG. 1 is used in a tray sealing machine.
  • trays to be sealed are loaded onto a lower tool half ( 20 in FIG. 3 ) attached to the upper end of each pillar 1 a , 1 b .
  • the lower tool half has an ejector plate which lowers the trays into a recess as the lower tool half is raised towards the upper tool half.
  • the lower and upper tool halves come into contact and form an air tight seal.
  • the upper tool half is heated so as to seal the film to the tray.
  • a single lane tray sealing machine 100 comprises two modules 101 , 102 in lateral proximity with a predefined pitch between the four pillars. Both modules 101 , 102 are connected to a common drive motor 3 via a tooth belt, and all four pillars are driven together, raising the lower tool half 20 of the tray sealing machine towards the upper tool half (not shown).
  • two modules 101 , 102 may be used in a dual-lane tray sealing machine 200 .
  • each module has a separate drive motor 3 and separate tooth belts. This allows each module to operate independently, allowing two separate lower tool halves 20 a , 20 b to operate independently.
  • the modules 101 , 102 are the same as those seen in FIG. 3 but are reversed from the single lane application. The pitch between the modules can be altered to suit the particular dual lane application due to the asymmetric design of the modules.
  • the lifting apparatus of the present invention can be used in a dual lane situation with independent tray sealing machine lower tool halves 20 a , 20 b , this advantageously allows different tray sizes to be packaged and sealed concurrently, increasing throughput. Enabling the use of independently operable lower tool halves also allows different numbers of trays to be sealed at a time on each lane. For example, two trays can be sealed at a time on one lane, and three at a time on the other. In this way, flexibility of tray sealing is further increased.
  • a lower tool half of a tray sealing machine may be supported by any number of pillars.
  • one pillar may be used to support a lower tool half.
  • the sealing load placed on the lifting mechanism is far greater than the lifting load caused by raising the lower tool half, as the sealing process forces the upper and lower tool halves apart.
  • the lifting apparatus of the present invention allows the lifting screw 2 and motor 3 to be isolated from the sealing load, as described below. This means that the lifting screw 2 does not need to be as robust as in the prior art, and can thus have a relatively small diameter, advantageously minimising manufacturing cost and mechanism size.
  • motor 3 and any electro-mechanical brake can be downsized as it does not have to drive a large lifting screw 2 or lifting mechanism designed to withstand the sealing load.
  • a spring housing 13 is attached to the underside of lifting plate 7 , said spring housing 13 housing two springs 6 coupled to the spring housing 13 and pillar 1 a .
  • a corresponding spring housing 13 with two springs 6 is provided for pillar 1 b , however for ease of understanding the lifting apparatus is described with reference to pillar 1 a in the following description.
  • pillar 1 a remains stationary but lifting plate 7 continues to move upwards towards plate 11 , thus compressing springs 6 .
  • the two springs are identical and so compress at the same rate, although different springs may be used.
  • a latching mechanism responds by latching the housing structure 9 to the pillar 1 a .
  • the latching mechanism comprises latches 4 located on the housing structure 9 which engage with each protruding portion 12 on the pillar 1 a .
  • the motor 3 stops at a predetermined position set in the motor control unit (not shown), but could equally be controlled by a sensor or switch attached to the mechanism.
  • the spring housings 13 contain two springs each. However, this is not necessarily the case and any number of springs may be used, for example a single spring. Alternatively, a hydraulic system using a compressible fluid may be implemented instead of the use of a spring(s).
  • the housing structure 9 and spring(s) 6 are not limited to their described position.
  • the spring housing 13 could be mounted on the upper side of lifting plate 7 , thus placing the spring(s) 6 under tension as the lifting plate 7 continues to rise when the upper and lower tool halves first come into contact.
  • the latching mechanism will now be described in more detail with reference to FIGS. 5 a , 5 b , 6 a and 6 b .
  • the latching mechanism comprises latches 4 and spring 6 as described above, as well as latch cam plate 5 and cam follower rollers 10 . Its operation will be described below.
  • FIGS. 5 a , 5 b , 6 a and 6 b are staggered cross-section diagrams taken along the axis x-x′.
  • FIG. 5 a shows a cross section taken through a pillar 1 a
  • FIG. 5 b shows a cross section taken through latch cam plate 5 , both before the latches 4 are engaged.
  • the two views are of the same pillar 1 a and have been shown side by side for ease of comparison and do not represent two independent pillars.
  • FIGS. 6 a and 6 b show the equivalent views when the latches 4 are engaged.
  • latch cam plate 5 (hereafter referred to as latch plate) fixedly coupled to lifting plate 7 is moved towards latches 4 as the lifting plate 7 is raised.
  • Latches 4 comprise two complementary structures 4 a and 4 b facing each other as seen in FIGS. 5 b and 6 b .
  • Each complementary structure 4 a , 4 b contains a cam follower roller 10 (hereafter referred to as roller).
  • lifting plate 7 continues to rise and compresses spring(s) 6 .
  • the latch plate 5 coupled to lifting plate 7 , will come into contact with the rollers 10 , specifically at the shaped portion 14 of the latch plate.
  • the spring(s) 6 will continue to compress until, at a predetermined compression point, the spring(s) becomes compressed enough to positively drive the latch plate 5 further upwards, forcing the rollers 10 along guided portion 14 into the recessed portion 16 of the latch plate 5 .
  • the motor 3 is driven in the reverse direction, thus causing the lifting plate 7 to lower away from the upper plate 11 .
  • This places the springs 6 under tension, and at a predetermined point in the extension of the springs, the rollers 10 are released from the recessed portion 16 in the latch plate 5 , and the shaped portion 14 of the latch plate positively drives the complementary structures 4 a and 4 b back to their original position.
  • the complementary structures are retained in their original position by the proximity of the pillar passing the latches 4 , as seen in FIG. 5 a . This releases protruding portion 12 on the pillar 1 .
  • latching mechanisms are envisaged.
  • electronically actuated latches could be engaged at the desired time using a control unit.
  • the sealed trays can be transported away from the lower tool half, for example by gripper arms and a conveyer, and unsealed trays to be sealed can be transported on to the lower tool half for the process to repeat.
  • the lifting apparatus is not restricted to the described embodiment.
  • the upper tool half may be moved towards a stationary lower tool half.
  • the lifting mechanism of the present invention can be used in conjunction with a twin lane device, an example of which being the QX-1100 manufactured by Ishida Europe Limited of Birmingham, United Kingdom.
  • the lifting apparatus of the present application can be used in other scenarios and apparatuses.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Closing Of Containers (AREA)
  • Package Closures (AREA)
  • Transmission Devices (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
US13/877,657 2010-10-07 2011-10-07 Tool lift mechanism Abandoned US20130318919A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB1016930.8A GB201016930D0 (en) 2010-10-07 2010-10-07 Lifting apparatus
GB1016930.8 2010-10-07
PCT/GB2011/051929 WO2012046076A1 (en) 2010-10-07 2011-10-07 Lifting apparatus

Publications (1)

Publication Number Publication Date
US20130318919A1 true US20130318919A1 (en) 2013-12-05

Family

ID=43304234

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/877,657 Abandoned US20130318919A1 (en) 2010-10-07 2011-10-07 Tool lift mechanism

Country Status (7)

Country Link
US (1) US20130318919A1 (ja)
EP (1) EP2625107B1 (ja)
JP (1) JP5583286B2 (ja)
ES (1) ES2509954T3 (ja)
GB (1) GB201016930D0 (ja)
RU (1) RU2541653C2 (ja)
WO (1) WO2012046076A1 (ja)

Cited By (2)

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US20120324835A1 (en) * 2011-06-24 2012-12-27 Multivac Sepp Haggenmuller Gmbh & Co. Kg Method and sealing station for sealing packaging units
US20170029145A1 (en) * 2015-07-31 2017-02-02 Belco Packaging Systems, Inc. Ejector for seal fixture machine

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US3420551A (en) * 1967-04-10 1969-01-07 Buford F Mcmillan Hitching system
US3590437A (en) * 1968-08-08 1971-07-06 Usm Corp Injection molding presses
US3659427A (en) * 1970-04-20 1972-05-02 Richard D Harza Refuse disposing unit
US3815470A (en) * 1970-08-05 1974-06-11 Charmilles Sa Ateliers Servo feed system for machine tool provided with locking mechanism
US3884017A (en) * 1972-09-07 1975-05-20 Metal Box Co Ltd Machine for closuring containers
US4137748A (en) * 1977-09-28 1979-02-06 The National Machinery Company Wedging structure for presses or the like
US4148203A (en) * 1977-10-07 1979-04-10 Dreis & Krump Mfg. Co. Computer-controlled press brake
US4408471A (en) * 1980-10-29 1983-10-11 Massachusetts Institute Of Technology Press brake having spring-back compensating adaptive control
US4639163A (en) * 1983-12-17 1987-01-27 Jean Walterscheid Gmbh Driveline coupling with safety interlock mechanism
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US4881399A (en) * 1986-05-29 1989-11-21 Moskovskoe Vyschee Tekhnicheskoe Uchilische Imeni N.E.Baumana Double-action screw press
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US6203236B1 (en) * 1998-04-24 2001-03-20 Robert Bosch Gmbh Quick assembling and disassembling device
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EP2625107A1 (en) 2013-08-14
RU2541653C2 (ru) 2015-02-20
JP5583286B2 (ja) 2014-09-03
WO2012046076A1 (en) 2012-04-12
RU2013120546A (ru) 2014-11-20
GB201016930D0 (en) 2010-11-24
JP2014506215A (ja) 2014-03-13
EP2625107B1 (en) 2014-09-03
ES2509954T3 (es) 2014-10-20

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