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
  • B65B43/00—Forming, feeding, opening or setting-up containers or receptacles in association with packaging
  • B65B43/42—Feeding or positioning bags, boxes, or cartons in the distended, opened, or set-up state; Feeding preformed rigid containers, e.g. tins, capsules, glass tubes, glasses, to the packaging position; Locating containers or receptacles at the filling position; Supporting containers or receptacles during the filling operation
  • B65B43/46—Feeding or positioning bags, boxes, or cartons in the distended, opened, or set-up state; Feeding preformed rigid containers, e.g. tins, capsules, glass tubes, glasses, to the packaging position; Locating containers or receptacles at the filling position; Supporting containers or receptacles during the filling operation using grippers
  • B65B43/465—Feeding or positioning bags, boxes, or cartons in the distended, opened, or set-up state; Feeding preformed rigid containers, e.g. tins, capsules, glass tubes, glasses, to the packaging position; Locating containers or receptacles at the filling position; Supporting containers or receptacles during the filling operation using grippers for bags
• • 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
  • B65B43/00—Forming, feeding, opening or setting-up containers or receptacles in association with packaging
  • B65B43/42—Feeding or positioning bags, boxes, or cartons in the distended, opened, or set-up state; Feeding preformed rigid containers, e.g. tins, capsules, glass tubes, glasses, to the packaging position; Locating containers or receptacles at the filling position; Supporting containers or receptacles during the filling operation
  • B65B43/54—Means for supporting containers or receptacles during the filling operation

Definitions

• the invention relates to a method, the preamble of claim 1.
• the generic filling of sacks is carried out using a wide variety of devices.
• the sack to be filled is often gripped by a plurality of pairs of gripper tongs during the filling process.
• FFS Form Fill and Seal
• Such a device is known, inter alia, from DE 199 36 660 A1.
• a tube section made of thermoplastic plastic with a bottom weld seam is filled with filling material in a filling station.
• the tongs of a pair of gripper tongs are first moved towards one another and, using suction devices, the hose section is opened for the purpose of lowering a filling funnel.
• a second pair of gripper tongs engages the sack.
• the sack material between the pairs of gripper tongs can be exposed to different mechanical loads than the rest of the sack material, especially during the filling process.
• the mechanical tension gradients that form in the ⁇ bag material have a number of disadvantages. So the bag material in are stretched in different ways, which leads in particular to impairing the visual appearance of the sack.
• the further processing of the bags which in FFS machines consists primarily of sealing the bags by welding, can be significantly impaired. If, for example, one of the pairs of gripper tongs releases the sack after the filling process, the material relaxes again so that the upper edge of the sack warps. When this warped sack edge is welded, an odd weld seam is created, which is optically unattractive in any case and may even have leaks.
• the object of the present invention is therefore to propose a generic method which prevents the formation of mechanical stress gradients in the bag material during filling.
• control device present in the machine controls at least one (80) of the at least two pairs of gripper tongs (76, 80), which touch the bag to be filled during the filling process, in such a way that the at least one pair of gripper tongs (80) within at least a period of time during the filling process allows sack material to slide through its tongs.
• the pair of gripper tongs through the tongs of which the sack material is to slide, are initially closed with great force and thus at high speed.
• the force closing the pliers is reduced or even reduced removed so that they allow the bag material to slide through. It is also advantageous if, after the filling process has ended, the tongs of the aforementioned pair of gripper tongs are closed again with great force, then this pair of gripper tongs can take over the removal of the bag directly.
• Fig. 1 is a schematic side view of the device
• FIG. 2 shows an enlarged view corresponding to FIG. 3 of a part of the filling station and the second welding station.
• FIG. 3 shows a detailed view of the filling station in a view rotated by 90 ° with respect to the view in FIG. 2 and
• FIG. 4 shows an enlarged view corresponding to FIG. 3 the the
• Figure 1 shows a device with a relatively short overall length for the manufacture, filling, closing and conveying of bags made of thermoplastic material, in which all processing stations are arranged in a single machine frame.
• an unrolling device 16 for a tubular film web made of thermoplastic and wound up to form a supply roll Plastic, preferably with side folds, in which a tubular film roll 18 is suspended.
• the tubular film web 20 drawn off from the tubular film roll 18 is cyclically advanced by a pair of preferred rollers 22 via deflecting rollers.
• the tubular film web drawn off from the supply roll 18 is pulled out by a pendulum roller 28 to form a web loop, which forms a web storage device, from which the cyclically advanced tubular film web is withdrawn and which thereby fills up again during the idle phases of the tubular film web 20 that the pendulum roller 28 pulls such a large section from the supply roll 18 that the loop again receives its length storing the section length.
• the pendulum roller 28 is mounted between two levers 30 mounted in the machine frame, which levers are pivoted cyclically by a pneumatic cylinder 31 from its pivoted-in position to its illustrated pivoted-out position.
• the pair of preferred rollers 22 pulls the tubular film web 20 running over the deflection roller 32 in the vertical direction and pushes them between a cross-welding and cross-cutting device 34.
• This cross-welding and cross-cutting device has, in a manner known per se, two interacting welding jaws and a cutting knife.
• a support 40 forming a coupling is mounted with the formation of a four-joint system, which is connected to an obliquely projecting collar piece 42 on which a first pair of gripping pliers 44 is arranged laterally below the opening edges of the hose sections is indicated by the gripping jaws shown.
• a crank rod 46 is articulated on the link 38 and is reciprocated by a crank 50 driven by a gear motor 48.
• the pivoting movement of the carrier 40 is so great that the pair of gripping tongs 44 which grips the bag section 58 below the transverse welding and cross-cutting device 34, the bag section by one cycle length along the circular arc 52 into a transfer station 54 promotes in which the gripping tongs 44 passes the bag section to a stationary pair of gripping tongs 57.
• the pair of gripper tongs 56 is carried by levers 62, 64, both of which are articulated on a push rod 66 and form a four-joint system with their articulation points on the push rod and the grippers.
• the lever 64 is a two-armed lever, the upper lever arm 68 of which is mounted fixed to the frame in the manner shown.
• the push rod 66 is articulated on a two-armed lever 70 mounted on the frame, the upper lever arm of which is loaded by a tension spring 72 in the manner shown.
• the crank 50 is designed as a cam in the manner shown, a cam roller 74 mounted on the lower lever arm of the two-armed lever 70 running on this cam.
• the push rod 66 is driven by its cam-lever-cam roller drive in such a way that the pair of gripper tongs 56 leads the bag section to a pair of gripper tongs 76 in advance.
• the pair of gripper tongs 76 engage laterally on the opening areas of the bag sections below the hopper 78. To open the bag section 58, both tongs of the pair of gripper tongs 76 move towards one another. At the same time, the pair of suckers 118 swings open via a pneumatic piston cylinder arrangement 116. As a result, the bag is pulled out laterally in the filling station in order to be able to receive the filling funnel 78 after lowering.
• a further pair of gripper tongs 80 is arranged on the carrier 40 and engages the bag section with great force before the filling process, the tongs having already been moved inward along the direction a.
• the force acting on the tongs of the pair of gripper tongs 80 is withdrawn, so that during the Filling the bag section 58 can slide through the tongs.
• the tongs of the pair of gripper tongs 80 again grip the sack section 58, which has now been tightened in the vertical direction, by the filling material.
• the opening edges of the filled sack are tightened in direction a and transferred to a welding station 82, in which closes a pair of welding jaws, not shown in FIG. 4, the tightly drawn opening edges of the sack with a transverse weld seam.
• a conveyor belt 86 provided with studs 84, which runs over end-side drive and deflection rollers 88, 90 and conveys the filled bags 92 from the filling and welding stations 60, 82 in time with their filling.
• the drive and deflection rollers 88, 90 of the conveyor belt 86 are mounted at the ends of a horizontal support 94 which can be raised and lowered in guides 96 fixed to the frame by a spindle drive 98, the spindle drive 98 being drivable via a geared motor 100.
• the filling station 60 is shown.
• the conveyor belt 94 with its deflecting roller 88 is arranged between the side parts 12 and 14.
• cleats 84 are arranged on the conveyor belt 94.
• the gripper pair 80 are moved in the arrow direction a via the double link 106.
• the stationary pairs of gripper tongs 76 do not have to be opened by 180 ° in order to grip the upper end of the bag 58.
• the necessary opening movement of the respective pair of pliers 102 and 104 of the stationary Gripper pliers pairs 76 can be explained with reference to FIG. 2.
• the pair of gripper tongs 102 is arranged rigidly vertically downward, as can be seen from the illustration in FIG. 2.
• the gripper pliers 104 which can be clampingly engaged, can be pivoted open via a pneumatic piston cylinder arrangement 108, the pivoting angle only enclosing an acute angle. This results in a comparatively small receiving opening for the pairs of grippers.
• the fourth pair of gripper tongs 56 sweeps a transport path 110 shown in dash-dot lines in FIG. 2, in which the delivery position for delivering the sack 58 to the pair of gripper tongs 76 arranged in a fixed manner at the filling station lies on a plane which is arranged a distance x higher than its take-over position 54 for the sack 58.
• This height difference x is shown in FIG. 4.
• the sack 58 After the sack 58 has been filled, it is gripped by the pair of gripper tongs 80, as shown in FIG. 4, below the pair of gripper tongs 76 (FIG. 3).
• This pair of gripper tongs like the pair of gripper tongs 76, can again be adjusted laterally in the direction of arrow a in FIG. 3.
• the upper edge region i.e. the region of the sack above the transport gripper pairs 80, must have the fixed jaws 102 of the gripper pair 76, as shown in FIG. 2 by the dashed drawing illustrated, dodge.
• this upper edge area rises again, as is also shown in the drawing.
• the sack Via the pair of transport grippers 80, the sack, which simultaneously lies on the conveyor belt 94 and is moved further over it, is pivoted along the dash-dotted line 112, this line representing the unimpeded movement path for the uppermost edge region of the sack 58.
• the sack 58 occupies a position in the welding station 82 which is a height difference x below the position in the filling station 60 (cf. FIG. 4).
• the upper edge of the sack is traced by means of the gripper pair 80 pressed down so that residual air is forced out of the upper part of the filled sack.
• the upper end of the bag In the area of the welding station 82, the upper end of the bag must in turn dodge the welding jaws 114, as is also shown graphically in FIG. 2. Here, too, the upper end will rise again due to the inherent elasticity of the plastic, so that the taut upper edge region of the filled sack 58 can be welded in the welding station 82.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Supplying Of Containers To The Packaging Station (AREA)
• Basic Packing Technique (AREA)
• Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
• Analysing Materials By The Use Of Radiation (AREA)

Applications Claiming Priority (1)

Publications (2)

Family

ID=33495521

Family Applications (1)

Country Status (6)

Families Citing this family (3)

Family Cites Families (2)

• 2003
  • 2003-06-06 DE DE50306549T patent/DE50306549D1/de not_active Expired - Fee Related
  • 2003-06-06 ES ES03740220T patent/ES2279958T3/es not_active Expired - Lifetime
  • 2003-06-06 AT AT03740220T patent/ATE353825T1/de not_active IP Right Cessation
  • 2003-06-06 EP EP03740220A patent/EP1667913B1/fr not_active Expired - Lifetime
  • 2003-06-06 WO PCT/EP2003/006112 patent/WO2004108536A1/fr not_active Ceased
  • 2003-06-06 AU AU2003304176A patent/AU2003304176A1/en not_active Abandoned

Non-Patent Citations (1)

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