EP0009521A1 - Improvements in machines for applying bags or sacks to the discharge spouts of bag-filling machines - Google Patents
Improvements in machines for applying bags or sacks to the discharge spouts of bag-filling machines Download PDFInfo
- Publication number
- EP0009521A1 EP0009521A1 EP78300434A EP78300434A EP0009521A1 EP 0009521 A1 EP0009521 A1 EP 0009521A1 EP 78300434 A EP78300434 A EP 78300434A EP 78300434 A EP78300434 A EP 78300434A EP 0009521 A1 EP0009521 A1 EP 0009521A1
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- EP
- European Patent Office
- Prior art keywords
- bag
- suction
- pick
- mouth
- machine
- 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.)
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Classifications
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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
- B65B43/00—Forming, feeding, opening or setting-up containers or receptacles in association with packaging
- B65B43/26—Opening or distending bags; Opening, erecting, or setting-up boxes, cartons, or carton blanks
- B65B43/30—Opening or distending bags; Opening, erecting, or setting-up boxes, cartons, or carton blanks by grippers engaging opposed walls, e.g. suction-operated
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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
- B65B43/00—Forming, feeding, opening or setting-up containers or receptacles in association with packaging
- B65B43/12—Feeding flexible bags or carton blanks in flat or collapsed state; Feeding flat bags connected to form a series or chain
- B65B43/14—Feeding individual bags or carton blanks from piles or magazines
- B65B43/16—Feeding individual bags or carton blanks from piles or magazines by grippers
- B65B43/18—Feeding individual bags or carton blanks from piles or magazines by grippers by suction-operated grippers
Definitions
- the present invention relates to the machine for applying bags or sacks to the discharge spouts of bag filling machines. More particularly, the invention relates to bag applying machines having a suction transfer device for advancing a bag towards the discharge spout of a filling machine and comprising opposed suction means for engaging opposite sides of the bag adjacent its mouth, and means for parting said opposed suction means so as to open the bag mouth for placing over the discharge spout.
- the bags or sacks handled by the machines may be made from paper, PVC or other plastics material.
- United Kingdom Patent specification No.1439687 describes a bag applying machine comprising a suction pick-up device which lifts a bag from a stack of flat bags and turns the bag from the horizontal position into a substantially vertical position, with its mouth disposed along one vertiral side edge of the bag, and a suction transfer device which engages the bag held by the pick-up device, advances the bag from the pick-up device into an upright nosition adjacent the discharge spout of a bag filling machine, with the bag mouth uppermost, and opens 1 bag mouth for placing over the discharge spout.
- the pick-up device comprises a pair of pick-up arms rockable about a horizontal axis and carrying suction cups for gripping a bag.
- the stack of bags to be fed to the machine is disposed to one side of the machine and the pick-up arms rock downwardly to engage the suction cups with the top bag in the stack.
- Suction is thereupon applied to the cups so that they grip the bag and the arms are swung upwardly in a vertical arc to move the bag from the horizontal position, in which it is removed from the stack, into a substantially vertical position with its mouth disposed along one vertical side edge of the bag.
- the suction transfer device which comprises a pair of transfer arms pivoted on a horizontal axis ar right angles to the pivot axis of the pick-up device and having pairs of opposed suction cups for engaging opposite sides of the bag.
- Suction is applied to the transfer suction cups, which grip the bag, and is removed from the pick-up suction cups, which release the bag, and the transfer device then swings upwardly to remove the bag from the pick-up device and advance it to the discharge spout of the bag filling machine.
- the transfer arms are moved apart so that the mouth of the bag is opened and placed over the discharge spout.
- the open mouth of the bag is not formed to a satisfactory configuration for presentation to the discharge spout of the filling machine and, frequently, results in failure of the mouth to slip over the spout, or incorrect positioning on the spout. and improper operation of the filling process.
- the pick-up device corr,rises arms which swing in a vertical arc in orner c turn the bag into a substantial vertical position for engagement by the transfer device, the pick-up device cannot commence its next cycle until the bag has been removed from its path of movement by the transfer device, thereby reducing the speed of operation of the machine.
- only one pick-up device can be provided for feeding the transfer device.
- the suction means of the transfer device comprises opposed main suction members arranged to engage a bag adjacent one end of its mouth and pivotally mounted so as to be rockable apart to open the mouth of the bag, and opposed auxilliary suction members rockably mounted about the pivot axes of the main suction members and arrange to engage the bag adjacent its mouth at positions spaced from said main suction members, said auxilliary suction members being rockable apart together with the main suction members to assist opening of the bag mouth.
- the suction members when the suction members are moved apart so as to open the bag mouth, they form the open mouth into a generally oval configuration which facilitates placing of the mouth over the discharge spout of the filling machine.
- a bag applying machine embodying this invention may include a suction pick-up device arranged to lift the bag from a stack of fl p bags and turn the bag from the horizontal position, in which it is removed from the stack, to a substantially vertical position with its mouth disposed along one vertical side edge of the bag.
- the transfer device is arranged to engage the bag held by the pick-up device in this substantially vertical position and advance the bag from the pick-up device for placement over the discharge spout of the filling machine.
- the pick-up device is reciprocable substantially vertically for lifting the bag from the stack and includes suction means for gripping the bag; which is rockable about a substantially horizontal axis so as to turn the bag into the vertical position preparatory to engagement by the transfer device.
- the pick-up device when the bag has been gripped by the transfer device and released by the pick-up suction means, the pick-up device can immediately commence its next cycle and travel downwardly to lift a succeeding bag from the stack, thereby enabling the speed of operation of the machine to be increased.
- the pick-up device may be reciprocable along a path disposed to one side of the vertical plane of movement of the transfer device and the pick-up suction means may be arranged to turn the bag substantially into said plane of movement so as to permit the bag to be engaged by the transfer device.
- the speed of operation of the bag applying machine may be further increased by arranging two such pick-up devices on opposite sides of the plane of movement of the transfer device, the two pick-up devices operating alternately to lift bags from two stacks for successive feeding to the transfer device.
- the source of suction for the pick-up and transfer devices is preferably a blower unit, such as a side- channel blower, which produces a high degree cf suction and a high volume flow of air.
- a blower unit such as a side- channel blower
- This is preferred to a vacuum pump, which prr uces a higher degree of vacuum but a lower volume air flow because the latter is unable to compensate for small leaks which may occur in the suction system.
- the suction may be applied to the devices via ductacomprising or extending through hollow casings forming the machine frame.
- the stack of bags may be contained in a fixed magazine on the machine, which magazine can be refilled by hand.
- stacks of bags may be loaded onto trolleys which can be wheeled into a position beneath the pick-up device and can be changed when necessary.
- the machine is fed with stacks of bags by a pneumatic system operating a magazine supply to the machine. This system is arranged to slide an empty magazine from under the pick-up device and feed a loaded magazine onto the machine in its place. The empty magazine is then clear of the machine for refilling whilst the machine is removing bags from the loaded magazine.
- a pneumatic system permits the use of several magazines loaded with different size bags and the system can be selectively operated to load the machine with a magazine containing the size of bag required for filling.
- the bag applying machine comprises a frame consisting of two upright casings 1, 2 disposed side-by-side in spaced relation and interconnected at their upper ends by a hollow bridge part 3.
- a horizontal support casing 4 projects from the foot of the upright casing 2.
- These casings may be prefabricated from sheet metal.
- a flat suction tank 5 Secured to the casing 2 adjacent its upper end and projecting outwardly above the support casing 4 is a flat suction tank 5 which supports a suction pick-up device 6 for removing bags from a stack of flat bags 7 disposed one on top of another and, in this case, carried on a trolley 8.
- This trolley has largo castors 9 which permit easy movement of the trolley over rough floor areas as the trolley is wheeled to the machine.
- the trolley is adapted to straddle the hollow support casing 4 which guides the trolley into the correct nosition under the pick-up device 6.
- the trolley includes small internal wheels ), schematically illustrated in Figure 6, which assist in accurately guiding the trolley onto the support casing.
- small additional wheels (not shown) on the underneath of the trolley ride-up the inclined leading edge 11 of the support casing 4, lift the larger running castors 9 off the floor and level the trolley at the correct height for removal of bags from the stack.
- the pick-up device 6 comprises a pick-up box 12 which is reciprocated vertically by means of a pneumatic cylinder and piston unit 13 mounted within the suction tank 5 and having its piston rod 14 connected to the pick-up box.
- the latter is guided by two hollow guide rods 15 which are secured to the box 12 and are slidable in sleeves 16 secured to the inside of the bottom of the suction tank.
- the internal bores of the guide rods are in communication with the interior of the box 12 whilst at their upper ends they open into the suction tank 5.
- pick-up suction members or fingers Mounted at opposite ends of the pick-up box 12 so as to be rockable about horizontal axes, are two elongated pick-up suction members or fingers 17. These pick-up fingers are more fully illustrated in Figure 4.
- Each finger is of hollow box-like construction and is of somewhat triangular shape in elevation.
- a hollow pivot shaft 18 is secured to the finger adjacent its wider end and its bore communicates with the interior of the hollow finger.
- the finger has a planar suction face defined by a grill 19 having slots 20 communicating with the interior of the finger.
- the suction face is provided with an elastomeric sealing element 21, conveniently a soft rubber sealing element, which projects proud of the suction face. In operation, the suction draws the fabric of a bag against the rubber sealing element, and this provides friction to hold the bag in place whilst it is bei-g manoeuvred by the suction finger.
- each suction finger is journalled in the adjacent end of the pick-up box 12 and connects the interior of the box with the interior of the associated suction finger so that suction applied to the tank is also applied to the fingers 17 via the hollow rods 15 and the pick-up box.
- the suction fingers are actuated by individual pneumatic cylinder and piston units 22 mounted within the pick-up box 12 and connected to crank arms 23 fixed to the pivot shafts 18 of the fingers.
- the pneumatic units 22 are operable in unison in order to rock the fingers between two positions in which the suction faces 19 of the fingers are respectively horizontal and vertical (see Figure 2).
- the pick-up device can be lowered so as to engage the fingers with the top bag on the stack 7. (The lowermost position of the pick-up device is illustrated in broken lines in Figures 1 and 2).
- the top bag is attached to the fingers by the application of suction, via the suction tank 5, and can be lifted from the stack, upon upward travel of the pick-up device, and turned from the horizontal position in which it is removed from the stack into a vertical position by rocking the suction fingers 17 into the positions in which the suction faces 19 are vertical, as the pick-up device is raised to its uppermost position (full lines in Figures 1 and 2.) In this position, the bag hangs from the fingers in a substantially vertical plane or position with its mouth at the side edge of the bag adjacent the upright casings 1, 2.
- the bag lifted and turned by the pick-up device 6 is carried to the discharge spout 24 of the bag filling machine 25 by a suction transfer device 26.
- the latter comprises a swinging arm 27 suspended between the upright casings 1 and 2 s ;d having trunnions 28 journalled in these upright casings.
- the swinging arm is a bifurcated member and has opposed suction operated, bag- holding means 20 mounted at the lower ends of its limbs 30 for engaging, adjacent its mouth, a bag lifted by the pick-up device, and for transferring the bag from the pick-up device to the spout 24.
- the suction means 29 are moved apart, as will hereinafter be described, to open the mouth of the bag and the swinging arm swings the bag into an upright position with its mouth uppermost for placing over the filling spout.
- Each suction means 29 includes an elongated suction member in the form of a suction finger 31 identical to the suction fingers 17 and having its hollow pivot shaft 32 journalled in the lower end of the associated limb 30 of the swinging arm.
- the two suction fingers 31 carried by the limbs 30 are disposed with their suction faces in opposed relation and are arranged so that when the suction means are fully closed together with no bag therebetween, the suction faces of the fingers are mutually parallel and in contact, via their rubber sealing elements.
- each finger 31 Freely pivoted on the pivot shaft 32 of each finger 31 is a spring-biassed arm 33 which projects forwardly of the associated finger and has an auxilliary suction member in the form of a suction box 34 rockably mounted at its free end in spaced relation with the assoicated suction finger.
- the suction boxes 34 are mutually opposed and of similar construction to the suction fingers. When the suction means 29 fully close together without a bag therebetween, the suction faces of the boxes 34 are in contact via their rubber sealing elements.
- Each arm 33 is coupled to its associated suction finger 31, so as to be rockable therewith over a predetermined ar of movement, via a lost motion coupling.
- the latter comprises a pair of abutments 36, 37 projecting in spaced relation from the suction finger 31 adjacent its pivot shaft and arranged alternatively to engage a small roller 38 mounted on the arm 33 between the abutments.
- the arm is biassed towards a central position by leaf springs 39 fastened to the arm and engaged between three rollers 40 mounted on the associated limb 30 of the swinging arm.
- the arrangement is such that each abutment 36 engages the adjacent roller 38, when the suction fingers 31 are rocked towards the closed position, in order positively to close together the suction boxes 34, and each abutment 37 engages the adjacent roller 38 upon opening of the suction fingers in order positively to drive the suction boxes to an open position during the final arc of opening movement of the suction fingers.
- Suction is applied to the suction fingers 31 and boxes 34 via the swinging arm 27 which is of hollow construction;
- the pivot shafts 32 of the suction fingers are in communication with the hollow interiors of the associated limbs 30 of the swinging arm, whilst the suction boxes 34 are connected to these limbs via pipes 42 fastened by suitable couplings to the ends of hollow pivot shafts 43 of the suction boxes, which shafts are journalled in collars 44 at the free ends of the supporting arms 33.
- this assembly comprises a pair of pneumatic cylinder and piston units 46, 47 mounted side-by-side and having their piston rods interconnected by a yoke member 48 which is pivoted to each piston rod.
- the centre of the yoke member 48 is connected to crank arms 49 fixed to the pivot shafts 32 of suction fingers 31 by two rods or cables, in this case Bowden cables 50, extending through the adjacent trunnion 28 of the swinging arm and the hollow limbs 30 of the arm.
- This assembly moves the suction fingers 31 in unison.
- both units 46, 47 When the pistons of both units 46, 47 are fully retracted the suction fingers and boxes are fully closed together. When both pistons are fully extended, the suction boxes and fingers are in their fully open position. When either one or other piston is extended and the other is retracted, the suction fingers and boxes are in a half-open position. The latter position permits the suction assemblies 29 to pass between the guide boards 48 of the conveyer mechanism 49 associated with the filling spout, during the return stroke of the swinging arm.
- the swinging arm 27 is moved between predetermined stations over its arc of movement by means of three pneumatic cylinder and piston units 50, 51, 52 connected in series ( Figure 7). These are mounted within the upright casing 2 and are connected between the casing and a crank arm 53 secured to the adjacent trunnion 28 of the swinging arm.
- the three series connected pneumatic units 50, 51, 52 are actuated in a predetermined secruence to rock the swinging arm through the following stations during each transfer cycle.
- the arm is rocked to a ccllecting station 54, at which it engages a bag carried by the pick-up device 6.
- the arm is then advanced to a ready station 56, at which the suction means 29 are fully opened to open the mouth of the bag preparatory to placing it over the filling spout 24, and subseque tly to a bag clamping station 57, at which the bag mouth is placed over and clamped to the filling spout.
- a bag clamping station 57 at which the bag mouth is placed over and clamped to the filling spout.
- the pneumatic units 50, 51, 52 are fully retracted, as illustrated in Figure 7.
- the pneumatic units rock the swinging arm from the bag clamping station back to the ready station 56, during which period the suction means 29 are half closed together, and thereafter to a near- vertical, rest station 55 in which the swinging arm is stopped preparatory to commencing the next transfer cycle.
- the source of suction for the machine is a side- channel blower 58, which is connected by a duct 59 to a cleaning box 60 mounted within the upright casing part 2.
- the cleaning box 60 has a removable bottom (not shown) so as to allow for removal of dirt sucked into the system through both sets of suction means and deposited in the cleaning box.
- the suction tank 5 is connected to the cleaning box 60 by a duct 61 extending through the upright casing 2.
- a duct 62 extending through the upright casing 2, the hollow bridge part 3 and coupled to the hollow trunnion 28 within the casing part 1 connects the interior of the hollow swinging arm 27, and hence the suction means 29 to the cleaning box.
- Both ducts 61, 62 are connected to the cleaning box via valves 63, 64, respectively.
- the electrical and pneumatic control systems 66, 67, respectively, for the machine are mounted within the upright casing 1 and comprise plug-in modules so that the electrical control relays 68 and the pneumatic valves 69 controlling the supply of air pressure to the various pneumatic cylinders can be readily changed by merely unplugging a defective component and replacing it with a new component.
- the pneumatic control module is connected to a pneuantic junction box 70 having plug-in connections for the pneumatic pipes 71 connecting the module to the pneumatic cylinders.
- the sequence of operations of the machine is as follows. Upon switching-on the electrical mains supply to the machine, the blower 58 is started and the following sequence of operations occurs:-
- a trolley 8 loaded with a stack of paper or plastics bags to be filled is moved onto the support casing 4, the mouths of the bags being adjacent the upright casings 1, 2.
- a microswitch is located in a suitable position on the casings to detect the presence of a stack of bags in position on the machina and, if absent, prohibits the machine from operating. With the stack of bags in position, the operator initiates automatic operation or the machine by depressing a cycle start switch, whereupon the air valves 63, 64 are closed and air pressure is applied to the pneumatic cylinder 13 so as to drive the pick-up box 12 downwardly until a microswitch on the bottom of the box touches the top bag of the stack loaded onto the machine. When this bottom microswitch is actuated, the following sequence of operations occurs:-
- the suction box 12 When the suction box 12 reaches its uppermost position, the bag has been turned into a vertical position or plane with its mouth disposed along the end or side edge of the bag adjacent the upright casings. A microswitch on top of the box is then actuated and this checks with a suction switch within the suction box to detect that a bag is in place. In the affirmative, these two switches provide a signal to initiate movement of the swinging arm 27 to the collecting station 54.
- the swinging arm is rocked into the collecting station by actuation of one or more of the pneumatic cylinders .50, 51, 52 and, at the same time, the suction holding means 29 are rocked into their fully open position.
- a first microswitch associated with the swinging arm trunnions 28 is actuated to cause air pressure to be applied to the cylinders 46, 47 so as fully to retract their piston rods and cause the suction means 29 to close together and grip the bag adjacent its mouth.
- the suction fingers 31 grip the bag held by the pick-up device over an extended zone adjacent the upper end of the bag mouth, whilst the suction boxes 34 grip the bag adjacent the lower end of the mouth.
- a first microswitch associated with one of the suction fingers 31 is actuated which initiates the following sequence of operations:-
- the swinging arm 27 with the bag gripped between the suction means 29 is now rocked by actuation of the pneumatic cylinders 50, 51, 52 into the ready station 56, this movement swinging the bag towards an upright position with its mouth uppermost.
- a second microswitch associated with the swinging arm trunnions 28 detects when the swinging arm is at the ready station and is connected in series with a suction switch responsive to suction within the swinging arm to detect that a bag is carried by the suction means at this station.
- the pneumatic cylinders 46, 47 are actuated so as to extend their piston rods and fully open the suction means 29, thereby to form the mouth of the bag into a generally oval shape for placirg over the spout (see Figure 3,) and a second microswitcb associated with thc suction fingers 31 actuates the pneumatic cylinders 50, 51, 52 to complete the forward stroke of the swinging arm and place the open mouth of the bag over the discharge spout 24.
- Movement of the swinging arm into the bag clamp ng station 57 actuates a third microswitch associated with the swinging arm trunnions which signals the existing bag clamp electrical circuit to close the bag clamp and grip the bag to the discharge spout. Closure of the bag clamp is detected by a microswitch on the spout and when this microswitch is actuated to indicate that the bag is clamped to the spout, the following sequence of operations occurs:-
- the swinging arm 27 is retained at rest in station 55 until the top microswitch on the suction box 12 again detects that the pick-up device has returned to its uppermost position carrying a fresh bag, whereupon the cycle of operations is automatically repeated, and so on until the stack of bags has been used-up or the machine is prematurely stopped by actuation of a suitable switch.
- second suction tand and pick-up device may be mounted on the upright casing 1 parallel to the suction tank 5 and pick-up device 6.
- This second pick-up device is arranged to pick-up bags from a stack contained on a trolley or magazine disposed beneath it and successively feed these bags to the transfer device 26 in alternate relation to the first pick-up device 6.
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Abstract
A machine for applying a bag to the discharge spout (24) of a bag-filling machine (25) comprises a suction pick-up device (6) for lifting the top bag from a stack offlat bags (7) and turning the bag into a vertical position with its mouth disposed along one vertical edge of the bag, and a suction transfer device (26)forengaging the bag held by the pick-up device, swinging the bag from the pick-up device to the discharge spout and, at the same time, opening the bag mouth so that it slips over the spout. The transfer device comprises opposed suction fingers (31) which engage the bag, when held by the pick-up device, adjacent the upper end of its mouth and are pivotally mounted so as to be rockable apart, and opposed auxiliary suction members (34) which are pivoted to arms (33 rockably mounted on the pivot axes of the suction fingers and which engage the bag adjacent the lower end of its mouth The suction fingers and auxiliary suction members are together rockable apart to open the bag mouth and fnrm the open bag mouth into a particularly satisfactory confiouration for facilitating application to the discharge spout (24
Description
- The present invention relates to the machine for applying bags or sacks to the discharge spouts of bag filling machines. More particularly, the invention relates to bag applying machines having a suction transfer device for advancing a bag towards the discharge spout of a filling machine and comprising opposed suction means for engaging opposite sides of the bag adjacent its mouth, and means for parting said opposed suction means so as to open the bag mouth for placing over the discharge spout. The bags or sacks handled by the machines may be made from paper, PVC or other plastics material.
- United Kingdom Patent specification No.1439687 describes a bag applying machine comprising a suction pick-up device which lifts a bag from a stack of flat bags and turns the bag from the horizontal position into a substantially vertical position, with its mouth disposed along one vertiral side edge of the bag, and a suction transfer device which engages the bag held by the pick-up device, advances the bag from the pick-up device into an upright nosition adjacent the discharge spout of a bag filling machine, with the bag mouth uppermost, and opens 1 bag mouth for placing over the discharge spout. The pick-up device comprises a pair of pick-up arms rockable about a horizontal axis and carrying suction cups for gripping a bag. The stack of bags to be fed to the machine is disposed to one side of the machine and the pick-up arms rock downwardly to engage the suction cups with the top bag in the stack. Suction is thereupon applied to the cups so that they grip the bag and the arms are swung upwardly in a vertical arc to move the bag from the horizontal position, in which it is removed from the stack, into a substantially vertical position with its mouth disposed along one vertical side edge of the bag. In this position, the bag is gripped adjacent its mouth by the suction transfer device which comprises a pair of transfer arms pivoted on a horizontal axis ar right angles to the pivot axis of the pick-up device and having pairs of opposed suction cups for engaging opposite sides of the bag. Suction is applied to the transfer suction cups, which grip the bag, and is removed from the pick-up suction cups, which release the bag, and the transfer device then swings upwardly to remove the bag from the pick-up device and advance it to the discharge spout of the bag filling machine. At the same time, the transfer arms are moved apart so that the mouth of the bag is opened and placed over the discharge spout.
- With a transfer device as described in the aforementioned specification, and other known types of transfer device, the open mouth of the bag is not formed to a satisfactory configuration for presentation to the discharge spout of the filling machine and, frequently, results in failure of the mouth to slip over the spout, or incorrect positioning on the spout. and improper operation of the filling process. Moreover, because the pick-up device corr,rises arms which swing in a vertical arc in orner c turn the bag into a substantial vertical position for engagement by the transfer device, the pick-up device cannot commence its next cycle until the bag has been removed from its path of movement by the transfer device, thereby reducing the speed of operation of the machine. Moreover, only one pick-up device can be provided for feeding the transfer device.
- It is an object of the present invention to provide a bag applying machine having a suction transfer device which is adapted to open the mouth of a bag advanced by the device and to form the open bag mouth into a satisfactory configuration for placing over the discharge spout of a filling machine so that bags are systematically placed in the correct position on the discharge spout. To this end, according to the invention, the suction means of the transfer device comprises opposed main suction members arranged to engage a bag adjacent one end of its mouth and pivotally mounted so as to be rockable apart to open the mouth of the bag, and opposed auxilliary suction members rockably mounted about the pivot axes of the main suction members and arrange to engage the bag adjacent its mouth at positions spaced from said main suction members, said auxilliary suction members being rockable apart together with the main suction members to assist opening of the bag mouth.
- With this invention, when the suction members are moved apart so as to open the bag mouth, they form the open mouth into a generally oval configuration which facilitates placing of the mouth over the discharge spout of the filling machine.
- A bag applying machine embodying this invention may include a suction pick-up device arranged to lift the bag from a stack of flp bags and turn the bag from the horizontal position, in which it is removed from the stack, to a substantially vertical position with its mouth disposed along one vertical side edge of the bag. The transfer device is arranged to engage the bag held by the pick-up device in this substantially vertical position and advance the bag from the pick-up device for placement over the discharge spout of the filling machine. Preferably the pick-up device is reciprocable substantially vertically for lifting the bag from the stack and includes suction means for gripping the bag; which is rockable about a substantially horizontal axis so as to turn the bag into the vertical position preparatory to engagement by the transfer device. With such a pick-up device, when the bag has been gripped by the transfer device and released by the pick-up suction means, the pick-up device can immediately commence its next cycle and travel downwardly to lift a succeeding bag from the stack, thereby enabling the speed of operation of the machine to be increased. The pick-up device may be reciprocable along a path disposed to one side of the vertical plane of movement of the transfer device and the pick-up suction means may be arranged to turn the bag substantially into said plane of movement so as to permit the bag to be engaged by the transfer device. The speed of operation of the bag applying machine may be further increased by arranging two such pick-up devices on opposite sides of the plane of movement of the transfer device, the two pick-up devices operating alternately to lift bags from two stacks for successive feeding to the transfer device.
- The source of suction for the pick-up and transfer devices is preferably a blower unit, such as a side- channel blower, which produces a high degree cf suction and a high volume flow of air. This is preferred to a vacuum pump, which prr uces a higher degree of vacuum but a lower volume air flow because the latter is unable to compensate for small leaks which may occur in the suction system. The suction may be applied to the devices via ductacomprising or extending through hollow casings forming the machine frame.
- The stack of bags may be contained in a fixed magazine on the machine, which magazine can be refilled by hand. Alternatively, stacks of bags may be loaded onto trolleys which can be wheeled into a position beneath the pick-up device and can be changed when necessary. In a further alternative, the machine is fed with stacks of bags by a pneumatic system operating a magazine supply to the machine. This system is arranged to slide an empty magazine from under the pick-up device and feed a loaded magazine onto the machine in its place. The empty magazine is then clear of the machine for refilling whilst the machine is removing bags from the loaded magazine. Moreover, such a pneumatic system permits the use of several magazines loaded with different size bags and the system can be selectively operated to load the machine with a magazine containing the size of bag required for filling.
- In order that the present invention may be more readily understood, reference will now be made to the accompanying drawings,in which:-
- Figure 1 is a side elevation of one embodiment of the invention and adjacent parts of a bag filling machine,
- Figure 2 is an end elevation of the bag applying machine from the direction of the arrow A in Figure 1,
- Figure 3 is a plar view of the bag applying machine shown in Figure 1,
- Figure 4 is a perspective view illustrating details of the main suction members,
- Figure 5 is a fragmentary view of the transfer device illustrating details of the coupling between a main suction member and the arm supporting the associated auxilliary suction member,
- Figure 6 is an end elevation with walls of the machine casings broken away to illustrate the interiors of the casings, and
- Figure 7 is a fragmentary side elevation with the adjacent casing wall broken away to show further de- ; tails of the interior of the casing.
- Referring to Figures 1, 2 and 3 of the drawings, the bag applying machine comprises a frame consisting of two
upright casings hollow bridge part 3. Ahorizontal support casing 4 projects from the foot of theupright casing 2. These casings may be prefabricated from sheet metal. - Secured to the
casing 2 adjacent its upper end and projecting outwardly above thesupport casing 4 is aflat suction tank 5 which supports a suction pick-updevice 6 for removing bags from a stack offlat bags 7 disposed one on top of another and, in this case, carried on atrolley 8. This trolley haslargo castors 9 which permit easy movement of the trolley over rough floor areas as the trolley is wheeled to the machine. The trolley is adapted to straddle thehollow support casing 4 which guides the trolley into the correct nosition under the pick-updevice 6. The trolley includes small internal wheels ), schematically illustrated in Figure 6, which assist in accurately guiding the trolley onto the support casing. Moreover, small additional wheels (not shown) on the underneath of the trolley ride-up the inclined leadingedge 11 of thesupport casing 4, lift the larger runningcastors 9 off the floor and level the trolley at the correct height for removal of bags from the stack. - The pick-
up device 6 comprises a pick-up box 12 which is reciprocated vertically by means of a pneumatic cylinder and piston unit 13 mounted within thesuction tank 5 and having its piston rod 14 connected to the pick-up box. The latter is guided by twohollow guide rods 15 which are secured to thebox 12 and are slidable insleeves 16 secured to the inside of the bottom of the suction tank. At their lower ends, the internal bores of the guide rods are in communication with the interior of thebox 12 whilst at their upper ends they open into thesuction tank 5. - Mounted at opposite ends of the pick-
up box 12 so as to be rockable about horizontal axes, are two elongated pick-up suction members orfingers 17. These pick-up fingers are more fully illustrated in Figure 4. Each finger is of hollow box-like construction and is of somewhat triangular shape in elevation. Ahollow pivot shaft 18 is secured to the finger adjacent its wider end and its bore communicates with the interior of the hollow finger. The finger has a planar suction face defined by agrill 19 havingslots 20 communicating with the interior of the finger. The suction face is provided with anelastomeric sealing element 21, conveniently a soft rubber sealing element, which projects proud of the suction face. In operation, the suction draws the fabric of a bag against the rubber sealing element, and this provides friction to hold the bag in place whilst it is bei-g manoeuvred by the suction finger. - As illustrated in Figures 1, 2 and 3, the
hollow pivot shaft 18 of each suction finger is journalled in the adjacent end of the pick-up box 12 and connects the interior of the box with the interior of the associated suction finger so that suction applied to the tank is also applied to thefingers 17 via thehollow rods 15 and the pick-up box. The suction fingers are actuated by individual pneumatic cylinder andpiston units 22 mounted within the pick-upbox 12 and connected tocrank arms 23 fixed to thepivot shafts 18 of the fingers. Thepneumatic units 22 are operable in unison in order to rock the fingers between two positions in which the suction faces 19 of the fingers are respectively horizontal and vertical (see Figure 2). Hence, with the pick-up fingers rocked into the positions in which the suction faces are horizontal, the pick-up device can be lowered so as to engage the fingers with the top bag on thestack 7. (The lowermost position of the pick-up device is illustrated in broken lines in Figures 1 and 2). The top bag is attached to the fingers by the application of suction, via thesuction tank 5, and can be lifted from the stack, upon upward travel of the pick-up device, and turned from the horizontal position in which it is removed from the stack into a vertical position by rocking thesuction fingers 17 into the positions in which the suction faces 19 are vertical, as the pick-up device is raised to its uppermost position (full lines in Figures 1 and 2.) In this position, the bag hangs from the fingers in a substantially vertical plane or position with its mouth at the side edge of the bag adjacent theupright casings - The bag lifted and turned by the pick-up
device 6 is carried to thedischarge spout 24 of thebag filling machine 25 by asuction transfer device 26. The latter comprises a swingingarm 27 suspended between theupright casings 1 and 2 s ;d having trunnions 28 journalled in these upright casings. The swinging arm is a bifurcated member and has opposed suction operated, bag- holding means 20 mounted at the lower ends of itslimbs 30 for engaging, adjacent its mouth, a bag lifted by the pick-up device, and for transferring the bag from the pick-up device to thespout 24. During this transfer step, the suction means 29 are moved apart, as will hereinafter be described, to open the mouth of the bag and the swinging arm swings the bag into an upright position with its mouth uppermost for placing over the filling spout. - Each suction means 29 includes an elongated suction member in the form of a
suction finger 31 identical to thesuction fingers 17 and having itshollow pivot shaft 32 journalled in the lower end of the associatedlimb 30 of the swinging arm.. The twosuction fingers 31 carried by thelimbs 30 are disposed with their suction faces in opposed relation and are arranged so that when the suction means are fully closed together with no bag therebetween, the suction faces of the fingers are mutually parallel and in contact, via their rubber sealing elements. Freely pivoted on thepivot shaft 32 of eachfinger 31 is a spring-biassed arm 33 which projects forwardly of the associated finger and has an auxilliary suction member in the form of asuction box 34 rockably mounted at its free end in spaced relation with the assoicated suction finger. Thesuction boxes 34 are mutually opposed and of similar construction to the suction fingers. When the suction means 29 fully close together without a bag therebetween, the suction faces of theboxes 34 are in contact via their rubber sealing elements. Eacharm 33 is coupled to its associatedsuction finger 31, so as to be rockable therewith over a predetermined ar of movement, via a lost motion coupling. - As illustrated in Figure 5, the latter comprises a pair of
abutments suction finger 31 adjacent its pivot shaft and arranged alternatively to engage asmall roller 38 mounted on thearm 33 between the abutments. The arm is biassed towards a central position byleaf springs 39 fastened to the arm and engaged between threerollers 40 mounted on the associatedlimb 30 of the swinging arm. The arrangement is such that eachabutment 36 engages theadjacent roller 38, when thesuction fingers 31 are rocked towards the closed position, in order positively to close together thesuction boxes 34, and eachabutment 37 engages theadjacent roller 38 upon opening of the suction fingers in order positively to drive the suction boxes to an open position during the final arc of opening movement of the suction fingers. Intermediate these two stages, there is a position where the suction fingers move independently of thearms 33, and hence the suction boxes, which are thereupon resiliently controlled by the leaf springs 39. - Suction is applied to the
suction fingers 31 andboxes 34 via the swingingarm 27 which is of hollow construction; Thepivot shafts 32 of the suction fingers are in communication with the hollow interiors of the associatedlimbs 30 of the swinging arm, whilst thesuction boxes 34 are connected to these limbs viapipes 42 fastened by suitable couplings to the ends ofhollow pivot shafts 43 of the suction boxes, which shafts are journalled incollars 44 at the free ends of the supportingarms 33. - The rocking movement of the
suction fingers 31, and hence thesuction boxes 34, is controlled by a pneumatic cylinder assembly mounted in theupright casing 2. Referring to Figures 6ani 7, this assembly comprises a pair of pneumatic cylinder andpiston units yoke member 48 which is pivoted to each piston rod. The centre of theyoke member 48 is connected to crankarms 49 fixed to thepivot shafts 32 ofsuction fingers 31 by two rods or cables, in thiscase Bowden cables 50, extending through theadjacent trunnion 28 of the swinging arm and thehollow limbs 30 of the arm. This assembly moves thesuction fingers 31 in unison. When the pistons of bothunits suction assemblies 29 to pass between theguide boards 48 of theconveyer mechanism 49 associated with the filling spout, during the return stroke of the swinging arm. - The swinging
arm 27 is moved between predetermined stations over its arc of movement by means of three pneumatic cylinder andpiston units upright casing 2 and are connected between the casing and acrank arm 53 secured to theadjacent trunnion 28 of the swinging arm. The three series connectedpneumatic units device 6. The arm is then advanced to aready station 56, at which the suction means 29 are fully opened to open the mouth of the bag preparatory to placing it over the fillingspout 24, and subseque tly to abag clamping station 57, at which the bag mouth is placed over and clamped to the filling spout. At this latter station, thepneumatic units ready station 56, during which period the suction means 29 are half closed together, and thereafter to a near- vertical,rest station 55 in which the swinging arm is stopped preparatory to commencing the next transfer cycle. - The source of suction for the machine is a side-
channel blower 58, which is connected by aduct 59 to acleaning box 60 mounted within theupright casing part 2.. Thecleaning box 60 has a removable bottom (not shown) so as to allow for removal of dirt sucked into the system through both sets of suction means and deposited in the cleaning box. Thesuction tank 5 is connected to thecleaning box 60 by aduct 61 extending through theupright casing 2. Aduct 62 extending through theupright casing 2, thehollow bridge part 3 and coupled to thehollow trunnion 28 within thecasing part 1 connects the interior of the hollow swingingarm 27, and hence the suction means 29 to the cleaning box. Bothducts valves 63, 64, respectively. - The electrical and
pneumatic control systems upright casing 1 and comprise plug-in modules so that the electrical control relays 68 and thepneumatic valves 69 controlling the supply of air pressure to the various pneumatic cylinders can be readily changed by merely unplugging a defective component and replacing it with a new component. The pneumatic control module is connected to apneuantic junction box 70 having plug-in connections for thepneumatic pipes 71 connecting the module to the pneumatic cylinders. - Under the control of the electrical and pneumatic systems, the sequence of operations of the machine is as follows. Upon switching-on the electrical mains supply to the machine, the
blower 58 is started and the following sequence of operations occurs:- - (a) the
air valves 63, 64 are opened, - (b) the swinging
arm 27 is positioned in itsrest station 55 with the suction holding means 29 in the half-open position, - (c) the pick-up
device 6 travels to its uppermost position and the suction pick-upfingers 17 are positioned horizontally. - A
trolley 8 loaded with a stack of paper or plastics bags to be filled is moved onto thesupport casing 4, the mouths of the bags being adjacent theupright casings air valves 63, 64 are closed and air pressure is applied to the pneumatic cylinder 13 so as to drive the pick-upbox 12 downwardly until a microswitch on the bottom of the box touches the top bag of the stack loaded onto the machine. When this bottom microswitch is actuated, the following sequence of operations occurs:- - (a) the air valve 63 is opened to apply suction to the
suction fingers 17, via thesuction tank 5 and theguide rods 15, so that the top bag is gripped to the suction fingers, - (b) air pres ure is applied to the cylinder 13 to raise the
suction ox 12 together with the bag Gripped thereto, - (c) air pressure is applied to the
pneumatic cylinders 22 so that the fingers and the bag are turned into the vertical position as the suction box travels upwardly. - When the
suction box 12 reaches its uppermost position, the bag has been turned into a vertical position or plane with its mouth disposed along the end or side edge of the bag adjacent the upright casings. A microswitch on top of the box is then actuated and this checks with a suction switch within the suction box to detect that a bag is in place. In the affirmative, these two switches provide a signal to initiate movement of the swingingarm 27 to the collecting station 54. The swinging arm is rocked into the collecting station by actuation of one or more of the pneumatic cylinders .50, 51, 52 and, at the same time, the suction holding means 29 are rocked into their fully open position. In the collecting station, a first microswitch associated with the swingingarm trunnions 28 is actuated to cause air pressure to be applied to thecylinders suction fingers 31 grip the bag held by the pick-up device over an extended zone adjacent the upper end of the bag mouth, whilst thesuction boxes 34 grip the bag adjacent the lower end of the mouth. Thereupon, a first microswitch associated with one of thesuction fingers 31 is actuated which initiates the following sequence of operations:- - (a) the
air valve 64 is opened so as to apply suction to the suction means 29, - (b) the air valve 63 is closed so as to shut-off suction to the pick-up device and cause the latter to release the bag,
- (c) the
pneumatic cylinders - (d) the
pneumatic cylinders 22 are actuated so as to turn the suction pick-upfingers 17 into their horizontal positions and the cylinder 13 is actuated so as to commence downward travel of the pick-up device for picking-up the next bag on the stack. - The above sequence of operations will only be initiated in response to actuation of the first microswitch associated with the
fingers 31 after a predetermined time delay controlled by the electrical control system, which time delay is sufficient to permit the preceding full bag to be moved away from beneath the discharge spout after the bag clamps have released the bag onto theconveyer mechanism 49. - The swinging
arm 27 with the bag gripped between the suction means 29 is now rocked by actuation of thepneumatic cylinders ready station 56, this movement swinging the bag towards an upright position with its mouth uppermost. A second microswitch associated with the swingingarm trunnions 28 detects when the swinging arm is at the ready station and is connected in series with a suction switch responsive to suction within the swinging arm to detect that a bag is carried by the suction means at this station. In the affirmative, thepneumatic cylinders thc suction fingers 31 actuates thepneumatic cylinders discharge spout 24. Movement of the swinging arm into the bag clamp ngstation 57 actuates a third microswitch associated with the swinging arm trunnions which signals the existing bag clamp electrical circuit to close the bag clamp and grip the bag to the discharge spout. Closure of the bag clamp is detected by a microswitch on the spout and when this microswitch is actuated to indicate that the bag is clamped to the spout, the following sequence of operations occurs:- - (a) the
air valve 64 is closed to shut-off suction to the swinging arm, - (b) the
pneumatic cylinders rest station 55, - (c) as the swinging arm commences its return stroke, one of the
pneumatic cylinders suction assemblies 29 so that they freely move between theguide boards 48 of the conveyer, - (d) a fourth microswitch associated with the swinging arm trunnions and connected in the weighing circuit of the bag filling machine prevents commencement of the bag filling operation until the swinging arm has moved away from the bag.
- The swinging
arm 27 is retained at rest instation 55 until the top microswitch on thesuction box 12 again detects that the pick-up device has returned to its uppermost position carrying a fresh bag, whereupon the cycle of operations is automatically repeated, and so on until the stack of bags has been used-up or the machine is prematurely stopped by actuation of a suitable switch. - Whilst a particular embodiment has been described, it will be understood that various modifications can be made without departing from the scope of the invention as defined by the appended claims. For example, in order to increase the speed of operation of the machine second suction tand and pick-up device may be mounted on the
upright casing 1 parallel to thesuction tank 5 and pick-updevice 6. This second pick-up device is arranged to pick-up bags from a stack contained on a trolley or magazine disposed beneath it and successively feed these bags to thetransfer device 26 in alternate relation to the first pick-updevice 6.
Claims (10)
1 . A machine for applying a bag or sack to the discharge spout (24) of a bag filling machine (25), in which a transfer device (26) for advancing the bag to the discharge spout comprises opposed suction means (29) for engaging opposite sides of the bag adjacent its mouth, and means (46-50) for parting said opposed suction means so as tc open the bag mouth for placing over the discharge spout, characterised in that the suction means (29) comprises opposed main suction.members (31) arranged to engage the bag adjacent one end of its mouth and pivotally mounted so as to be rockable apart to open the mouth of the bag, and opposed auxilliary suction members (34) pivotally mounted coaxially with the pivot axes of the main suction members and arranged to engage the bag adjacent its mouth at positions spaced from said main suction members, said auxilliary suction members being rockable apart together with the main suction members to assist opening of the bag mouth.
2. A machine as claimed in claim 1, characterised in that the auxilliary suction members (34) are pivoted on arms (33) which are pivotally mounted coaxially with the main suction members, and coupling means (36-40) connects the main suction members (31) to the arms (3) so that said arms are rocked in response to rocking movement of the main suction members.
3. A machine as claimed in claim 1 or 2, characterised in that the suction members (31,34) are rockable by two fluid-operated cylinder and piston units (46,47) mounted side-by-side and having their piston rods interconnected by a yoke member (48), said yoke member being pivoted to the piston rods and being connectod to crank arms (49) secured to the pivots of the suction members by means (50) which z attached to the yoke member intermediate its ends, whereby the suction members can be rocked together, or fully apart, or to an intermediate position by selective actuation of the cylinder and piston units (46,47).
4. A machine as claimed in claim 1, 2 or 3 characterised in that the transfer device includes a swinging arm (27) which mounts the suction members (31, 34) and is at least partially hollow and serves as ducting for connecting the suction members to a source of suction.
5. A machine as claimed in claim 4, characterised in that the swinging arm (27) is rocked about its swing axis by fluid-operated means (50, 51, 52), whereby the swinging arm is movable between predetermined stations during each transfer cycle, in which stations the bag is engaged by the suction members (31, 34), the bag mouth is opened preparatory to placing over the discharge spout, the bag is placed over the discharge spout and released, and the swinging arm is stopped after its return stroke, and prior to commencing the next transfer cycle.
6. A machine as claimed in any one of the preceding claims, in which a suction pick-up device (6) is adapted to lift the bag from a stack of flat bags (7) and turn the bag from a horizontal position into a substantially vertical position, with its mouth disposed along one vertical side edge of the bag, and the transfer device is arranged to engage the bag held by the pick-up device in a substantially vertical position and advance the bag from the pick-up device into a substantially upright position, in which the mouth is uppermost, and open the bag mouth for placing over the discharge spout, characterised in that the suction pick-up device (6) is reciprocable substantially vertically for lifting the bag from the stack, an" includes suction means (17) which is rockable abou; a substantially horizontal axis so as to turn the bag into a substantially vertical position preparatory to engagement by the transfer suction members (31, 34).
7. A machine as claimed in claim 6, characterised in that the pick-up device (6) is reciprocable along a path disposed to one side of the vertical plane of movement of the transfer device (26) and the pick-up suction means (17) is arranged to turn the bag substantially into said plane of movement of the transfer deviee, when it turns the bag into the substantially vertical position so as to permit the bag to be engaged by the transfer suction members.
8. A machine as claimed in claim 6 or 7, characterised in that the pick-up suction means comprises pick-up suction members (17) pivotally mounted on suction box (12) which is reciprocable substantially vertically by fluil-operated means (13) and is guided for vertical movement by at least one hollow guide rod (15) via which suction is applied to the suction box and, hence, the pick-up suction members.
9. A machine as claimed in claim 8, characteriesed in that the or each hollow guide rod (15) is slidably mounted at its upper end in a suction tank (5; which is connectable to a source of suction, and the pick-up suction members (17) are connected to the suction tank via the pick-up box and the hollow guide rod(-).
10. A machine as claimed in any one of the preceding claims, characterised in that the source of suction comprises a blower unit (58).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP78300434A EP0009521A1 (en) | 1978-09-29 | 1978-09-29 | Improvements in machines for applying bags or sacks to the discharge spouts of bag-filling machines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP78300434A EP0009521A1 (en) | 1978-09-29 | 1978-09-29 | Improvements in machines for applying bags or sacks to the discharge spouts of bag-filling machines |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0009521A1 true EP0009521A1 (en) | 1980-04-16 |
Family
ID=8186001
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP78300434A Withdrawn EP0009521A1 (en) | 1978-09-29 | 1978-09-29 | Improvements in machines for applying bags or sacks to the discharge spouts of bag-filling machines |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0009521A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0424361A2 (en) * | 1988-12-14 | 1991-04-24 | Decomatic S.A. | Fluid-flow restricting devices, in particular for manufacturing bags made of flexible material, in particular of plastic |
EP3181462B1 (en) * | 2015-12-17 | 2019-07-24 | BEUMER Group GmbH & Co. KG | Method and device for fitting valve sacks |
CN112758419A (en) * | 2020-12-22 | 2021-05-07 | 丽水学院 | Weighing device capable of automatically bagging and calculating total price and using method thereof |
CN113479424A (en) * | 2021-07-29 | 2021-10-08 | 广东大宇智能设备有限公司 | Transfer unloader and dispensing device are moulded in inhaling down of screen protection piece packing |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2281516A (en) * | 1941-01-02 | 1942-04-28 | Thomas M Royal | Container handling apparatus |
FR1571575A (en) * | 1967-06-09 | 1969-06-20 | ||
DE2642175A1 (en) * | 1976-09-20 | 1978-03-23 | Willi Naumann | Empty bag opening mechanism - passes bags between parallel offset belts with coating of adhesive |
-
1978
- 1978-09-29 EP EP78300434A patent/EP0009521A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2281516A (en) * | 1941-01-02 | 1942-04-28 | Thomas M Royal | Container handling apparatus |
FR1571575A (en) * | 1967-06-09 | 1969-06-20 | ||
DE2642175A1 (en) * | 1976-09-20 | 1978-03-23 | Willi Naumann | Empty bag opening mechanism - passes bags between parallel offset belts with coating of adhesive |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0424361A2 (en) * | 1988-12-14 | 1991-04-24 | Decomatic S.A. | Fluid-flow restricting devices, in particular for manufacturing bags made of flexible material, in particular of plastic |
EP0424361A3 (en) * | 1988-12-14 | 1991-09-18 | Decomatic S.A. | Fluid-flow restricting devices, in particular for manufacturing bags made of flexible material, in particular of plastic |
EP3181462B1 (en) * | 2015-12-17 | 2019-07-24 | BEUMER Group GmbH & Co. KG | Method and device for fitting valve sacks |
CN112758419A (en) * | 2020-12-22 | 2021-05-07 | 丽水学院 | Weighing device capable of automatically bagging and calculating total price and using method thereof |
CN113479424A (en) * | 2021-07-29 | 2021-10-08 | 广东大宇智能设备有限公司 | Transfer unloader and dispensing device are moulded in inhaling down of screen protection piece packing |
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