Classifications

• • 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
  • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
  • B65B11/02—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders
  • B65B11/025—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders by webs revolving around stationary articles
• • 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
  • B65B2210/00—Specific aspects of the packaging machine
  • B65B2210/14—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles
  • B65B2210/18—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles the web dispenser being mounted on a rotary ring

Definitions

• the present invention relates to a method for improving the operating efficiency of a wrapping machine, in which wrapping method at least two plastic film band rolls are placed inside the wrapping machine, plastic film band from at least one roll is wrapped about the object to be wrapped next, - after the object has been wrapped up, the plastic film band is seamed and severed, whereupon the next object can be wrapped, and that the wrapping action can be continued until the plastic film band on the roll has been used up.
• the wrapping machine is stopped when the plastic film band on the roll has been used up. After that, the empty roll is replaced with a full one either manually or by means of an automatic roll changing mechanism.
• changing the roll always involves the waste of a considerable deal of valuable wrapping time.
• An automatic roll changing operation also takes a long time because even in this case the roll changing mechanism must first get the empty roll out of the stopped wrapping machine and then bring in a full roll to replace the empty one from outside the wrapping machine.
• the invention also relates to an apparatus for improving the operating efficiency of a wrapping machine, said wrapping machine comprising - at least two wrapping devices, such as wrapping carriages, provided with plastic film band rolls to allow plastic film band to be wound about the object to be wrapped, and means for seaming and severing the plastic film band.
• wrapping machine comprising - at least two wrapping devices, such as wrapping carriages, provided with plastic film band rolls to allow plastic film band to be wound about the object to be wrapped, and means for seaming and severing the plastic film band.
• a known solution is to provide the wrapping machine with an automatic device for changing the plastic film band roll, by means of which an exhausted plastic film band roll can be replaced with a full one.
• the change of rolls is performed with the wrapping machine in a fully inactive state.
• the changing mechanism extracts the empty roll from inside the wrapping machine and moves it out of the machine. After that, the changing mechanism takes a full roll onto the wrapping carriage inside the machine.
• the automatic roll changing mechanism is technically complicated and its operation takes a relatively long time because the wrapping machine has to be brought to a complete standstill for the duration of the roll change.
• the roll changing mechanism must first get the empty roll out of the wrapping machine and then bring in a full roll from outside the machine to replace the exhausted one.
• the object of the invention is to achieve a method and an apparatus for improving the operating efficiency of a wrapping machine which do not have the above-described disadvantages.
• the method of the invention is characterized in that, after one plastic film band roll has been used up, wrapping is continued from another, full plastic film band roll placed inside the wrapping machine.
• each plastic film band roll is placed on a separate wrapping device, and that after the plastic film band roll being used for wrapping has been exhausted, the wrapping operation is continued using another wrapping device which contains a full plastic film band roll.
• the wrapping operation is started or continued using a wrapping device containing a full plastic film band roll by gripping the end of the plastic film band coming from the full plastic film band roll and locking it in place before starting the wrapping of the next object to be wrapped.
• the apparatus of the invention is characterized in that the wrapping machine comprises means for switching the wrapping process from an exhausted plastic film band roll to a full plastic film band roll.
• the means for switching the wrapping process from one roll to another are technically simple and therefore reliable in operation.
• a preferred embodiment of the apparatus of the invention is characterized in that the wrapping machine comprises at least two separate wrapping devices, such as wrapping carriages, containing a plastic film band roll, and that the wrapping machine is provided with a switch-over gripper for gripping the end of the plastic film band coming from a full plastic film band roll.
• a second preferred embodiment of the apparatus of the invention is characterized in that the switch-over gripper can be moved to a position near the end of the plastic film band coming from the plastic film band roll and in a direction away from said plastic film band end, and that a seaming gripper is placed near the path of the switch-over gripper, and that the seaming gripper has been arranged to grip the plastic film band drawn out from the plastic film band roll by the switch-over gripper.
• a third preferred embodiment of the device of the invention is characterized in that the wrapping device, such as wrapping carriage, containing a plastic film band roll is provided with a holder in which the end of the plastic film band is set so that it can be gripped by the switch-over gripper.
• Fig. 1 presents a diagrammatic side view of a wrapping machine with two wrapping carriages.
• Fig. 2-4 present the wrapping machine of Fig. 1 at different stages of a roll change operation.
• Fig. 5 presents the wrapping machine of Fig. 1 at the start of a wrapping operation.
• Fig. 6 presents the wrapping machine of Fig. 1 in diagrammatic top view.
• Fig. 1 presents a side view of a wrapping machine 10 for winding a plastic film band 32 about an object 60 to be wrapped, which is placed on a conveyor track 61.
• the wrapping machine 10 is a ring-type wrapping machine with a hoisting frame 20 vertically movable along vertical rails 21. Supported by support rollers 23 on the hoisting frame 20 is the rotating ring 22 of the wrapping machine 10, carrying two wrapping carriages 30a and 30b.
• Attached to the hoisting frame 20 is a seaming unit 40 provided with a gripper 41 for gripping the plastic film band as well as means for seaming and severing the plastic film band.
• Each wrapping carriage 30a and 30b carries a roll 31a, 31b of plastic film band 32a, 32b to be wound about the object to be wrapped 60.
• the ends 33a and 33b of the plastic film bands are placed in holders 34a and 34b.
• the wrapping machine 10 further comprises a switch-over gripper unit 50, which moves horizontally on a slide 52.
• the switch-over gripper unit 50 is provided with gripper jaws 51 which can grip the plastic film band ends 33a and 33b in the holders 34a and 34b on the wrapping carriages 30a and 30b.
• the rotating ring 22 of the wrapping machine 10 is turned to a position such that the holder 34a of the a plastic film band end 33a on one of the wrapping carriages, in Fig. 1 wrapping carriage 30a, is aligned with the gripper jaws 51 of the switch-over gripper unit 50.
• Fig. 2 illustrates the initial stage of a roll change operation in the wrapping machine 10.
• the switch-over gripper unit 50 has been raised so that the gripper jaws 51 are at the level of the plastic film band ends 33a and 33b in the holders 34a and 34b of the wrapping carriages 30a and 30b.
• the switch-over gripper unit 50 is moving horizontally on the slide 52, in Fig. 2 to the left, the gripper jaws 51 are opened.
• the gripper jaws 51 of the switch-over gripper unit 50 of the wrapping machine 10 have gripped the end 33a of the plastic film band.
• the switch-over gripper unit 50 has moved to the right in Fig.
• Fig. 4 the gripper 41 of the seaming unit 40 of the wrapping machine 10 has engaged the plastic film band 32a and the gripper jaws 51 of the switch-over gripper unit 50 have been opened.
• This situation corresponds to a situation in a prior-art wrapping machine where the end of the plastic film band to be used for wrapping has been set into the gripper of a seaming unit to allow the wrapping to be started or continued from a new, full roll.
• the gripper 41 of the seaming unit 40 of the wrapping machine 10 has turned into a horizontal position in a known manner and the ring 22 with the wrapping carriages 30a and 30b has started to rotate, so the wrapping of the object 60 with plastic film band 32a has begun.
• the switch-over gripper unit 50 has returned to its initial position, i.e. to the low position so that it is out of the way of the circulating wrapping carriages 30a and 30b.
• the object 60 is being wrapped with plastic film band 32a obtained from a roll 31a on wrapping carriage 30a.
• the roll 31b on the other wrapping carriage 30b attached to the rotating ring 22 is circulating with the ring but only as a stand-by roll ready for use when roll 31a is exhausted.
• roll 31a runs out of plastic film band
• the wrapping is continued using the roll 31b on the other wrapping carriage 30b.
• Roll 31b is put into active use by steps identical with those for roll 31a as illustrated in Fig. 2-4.
• both rolls 31a and 31b are already within the wrapping machine 10, the roll change can be performed substantially faster and more effectively than in prior-art wrapping machines, in which the new roll is always brought in from outside the machine.
• Fig. 6 presents a simplified top view of the wrapping machine 10 in Fig. 1.
• the rotating ring 22 of the wrapping machine 10 is provided with two wrapping carriages 30a and 30b, each carrying a plastic film band roll 31a, 31b.
• the end of the plastic film band 32a, 32b on each roll 31a, 31b is placed in a holder 34a, 34b attached to the wrapping carriage 30a, 30b.
• Fig. 6 illustrates an initial situation in which each wrapping carriage 30a, 30b of the wrapping machine 10 is provided with a full plastic film band roll 31a, 31b.
• the rotating ring 22 In preparation for the start of the wrapping action, the rotating ring 22 has been turned to an initial position such that the end 33a of the plastic film band 32a in the band holder 34a of the first wrapping carriage 30a is aligned with the jaws 51 of the switch-over gripper unit 50.
• the switch-over gripper unit 50 moves to the left in Fig. 6 and the gripper jaws 51 grip the end 33a of the plastic film band 32a in holder 34a, as is also shown in Fig. 2.
• the gripper jaws 51 pull the end 33a of the plastic film band 32a to the right in Fig. 6 so that the plastic film band 32a extends across the gripper 41 of the seaming unit 40.
• the gripper 41 now engages the plastic film band 32a and the jaws 51 of the switch-over gripper unit 50 are opened, as is also shown in Fig. 4.
• the machine can start wrapping the object 60 on the conveyor track 61 from the roll 31a on wrapping carriage 30a.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Basic Packing Technique (AREA)

Applications Claiming Priority (3)

Publications (1)

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Family Applications (1)

Country Status (5)

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Family Cites Families (5)

• 2000
  • 2000-08-10 FI FI20001779A patent/FI20001779A/fi not_active Application Discontinuation
• 2001
  • 2001-08-08 AU AU2001279865A patent/AU2001279865A1/en not_active Abandoned
  • 2001-08-08 EP EP01958127A patent/EP1317377A1/de not_active Withdrawn
  • 2001-08-08 CA CA002418366A patent/CA2418366A1/en not_active Abandoned
  • 2001-08-08 WO PCT/FI2001/000702 patent/WO2002012065A1/en not_active Application Discontinuation

Non-Patent Citations (1)

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