US20140116010A1 - High-Capacity, High-Speed Bag Loading and Sealing System - Google Patents
High-Capacity, High-Speed Bag Loading and Sealing System Download PDFInfo
- Publication number
- US20140116010A1 US20140116010A1 US14/064,749 US201314064749A US2014116010A1 US 20140116010 A1 US20140116010 A1 US 20140116010A1 US 201314064749 A US201314064749 A US 201314064749A US 2014116010 A1 US2014116010 A1 US 2014116010A1
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- United States
- Prior art keywords
- bags
- sealing system
- bag loading
- gripper
- bag
- 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
-
- 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
- B65B43/123—Feeding flat bags connected to form a series or chain
-
- 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
- B65B43/267—Opening of bags interconnected in a web
-
- 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
-
- 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
- B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
- B65B51/10—Applying or generating heat or pressure or combinations thereof
- B65B51/20—Applying or generating heat or pressure or combinations thereof by fluid pressure acting directly on folds or on opposed surfaces, e.g. using hot-air jets
-
- 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
- B65B57/00—Automatic control, checking, warning, or safety devices
- B65B57/02—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of binding or wrapping material, containers, or packages
- B65B57/04—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of binding or wrapping material, containers, or packages and operating to control, or to stop, the feed of such material, containers, or packages
-
- 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
- B65B59/00—Arrangements to enable machines to handle articles of different sizes, to produce packages of different sizes, to vary the contents of packages, to handle different types of packaging material, or to give access for cleaning or maintenance purposes
- B65B59/003—Arrangements to enable adjustments related to the packaging material
-
- 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
- B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
- B65B61/005—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for removing material by cutting
-
- 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
- B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
- B65B61/04—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages
- B65B61/12—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by tearing along perforations or lines of weakness
-
- 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
- B65B59/00—Arrangements to enable machines to handle articles of different sizes, to produce packages of different sizes, to vary the contents of packages, to handle different types of packaging material, or to give access for cleaning or maintenance purposes
- B65B59/001—Arrangements to enable adjustments related to the product to be packaged
Definitions
- the present invention pertains generally to automated packaging and more specifically to automated machinery for opening, inserting product into and sealing a continuous series of bags such as polyethylene bags at a very high rate.
- Automated packaging devices and machines that package various items into polymer-based bags are limited in the number of bags that can be filled at one time or in a single cycle, the amount of weight that each bag can carry in the filling process, and the ability to adjust to accommodate bags of different sizes. Sealing of bags in a continuous operation is typically done as a separate operation which is a serious impediment to speed and total packaging production rate.
- Another aspect of the invention is the provision of a bag loading and sealing system that sequentially opens the bags and substantially separates them from each other prior to filling.
- Yet a further aspect of the invention is the provision of a bag loading and sealing system that opens the bags with an adjustable gripper chain that is adapted for adjustment to accommodate bags of various sizes.
- Still a further aspect of the invention is the provision of a bag loading and sealing system that opens the bags wide, with a substantially rectangular mouth for ease of filling.
- An additional aspect of the invention is the provision of a bag loading and sealing system that seals the bags with blown hot air to accommodate continuous transport through the sealing mechanism.
- Yet another aspect of the invention is the provision of a bag loading and sealing system that employs a take-up winder for uniformly winding onto a spool a portion of the web of bags trimmed during the transporting and sealing operation.
- Still a further aspect of the invention is the provision of a bag loading and sealing system that is continuous in operation, reliable in performance, and conducive to implementation with state of the art components.
- the high speed high capacity bag loading and sealing system of the present disclosure utilizes a continuous roll of tubular form polyethylene material or the like, separable in pre-defined sections to define a continuous series of individual bags, opens each bag at one end and establishes registration of the location of each bag in the series, grips and spreads the opposing edges of the upper peripheral end of each opened bag for conveyance along a fill path by dual path gripper chains; the gripper chains transferring filled bags to a pair of opposing transfer belts to transfer each bag from the gripper chain to the transfer belts, the transfer belts interfaced with opposing sealer belts for transfer of each bag from the transfer belts to the sealer belts upon trimming of the opposing edges of the upper peripheral end of each bag with the opposing edges of the upper end of each bag in a closed state, the sealer belts operative to carry each bag to at least one sealing apparatus, the sealer belts and sealer operable continuously and independent of the operation of the gripper chains and transfer belts.
- the system can accommodate bags of many different sizes, different material and material weight, and substantially higher bag content weight by the utilization of gripper chains.
- the amount of excess material which constitutes the continuous strip at the top of the series of bags is significantly reduced by trimming closely proximate to the gripping region of the gripper chains.
- Mechanical and/or optical sensing of the precise location of each bag assures registration of the bags with the system throughout the operation.
- the system can operate at high speeds relative to prior art bag filling equipment, such as at least 100 feet per minute or 200 bags per minute or greater. And the bags can be advanced through the filling station continuously or intermittently, or the filling operation stopped entirely without affecting operation of the sealer.
- FIG. 1 is a schematic side elevational view of a bag loading and sealing system made according to the invention
- FIG. 2 is an illustration of a web of bags adapted for use with the bag loading and sealing system of FIG. 1 ;
- FIG. 3 is an illustrative view of the station of the invention for slitting a tubular web of bags open;
- FIG. 4 shows an alternative registration device from that employed in the embodiment of FIG. 3 ;
- FIG. 5 is an illustrative view of the perforation separator used with an embodiment of the invention.
- FIG. 6 is a top plan view of the station for slitting the bags open, with the cover removed;
- FIG. 7 shows the exit end of the conveyor, with the transfer region and heat sealer next in line
- FIG. 8 shows the drive assembly for the gripper chain, absent the gripper chain sprocket
- FIG. 9 shows the assembly of FIG. 8 with the chain sprockets in place
- FIG. 10 shows the gripper belt assembly of an embodiment of the invention
- FIG. 11 shows the heat sealer of the invention in association with an illustration of the gripper belt and heater belt transfer
- FIG. 12 is an illustration of the trip winder of the invention.
- a bag loading and sealing system made in accordance with an embodiment of the invention is designated generally by the numeral 10 .
- a roll of bags 12 is shown in association with a turn bar 14 to introduce a web of interconnected bags to the mechanism for opening, filling and sealing them. It will be appreciated that while a roll of bags 12 may be employed, it is also within the scope of the invention to employ a box of fan-folded bags or the like.
- the web of interconnected bags is passed to a first station 16 for slitting the bags open, partially separating the bags of the web from each other, and gripping the open top edges of the bags to transport them through a filling station 18 , with the bags having a substantially rectangular opening.
- a support conveyor 20 Positioned beneath the transport and filling section 18 is a support conveyor 20 , which may be employed to support the bottom of the bags of the transported web through the filling station and, most particularly, through the sealing mechanism to be described below.
- the support conveyor ensures that the bags, once filled, are maintained for transport by the gripper chain or gripper belts, as the case may be.
- a transfer region 22 the web of bags is transferred from a gripper chain to a first gripper belt and then subsequently to a second gripper belt as will be discussed below.
- a control box 24 for controlling the motion of the conveyor 20 , chain and belt drives, and the like is provided as at 24 .
- the control box 24 may comprise a dedicated microprocessor or the like, receiving signals from photodetectors and the like later described, and accordingly controlling the movement of the web of bags along the assembly and in appropriate registration.
- the sealer system 26 is a hot air system, as will be described herein, but other various types of sealers, such as hot rollers and the like are also contemplated.
- a trim winder 28 is provided for retrieving trimmed material from the top of the web of bags that is trimmed off just prior to sealing.
- the web or chain of bags 30 is typically of a continuous tubular nature, as will be appreciated by those skilled in the art.
- the web 30 comprises a series of interconnected bags 32 , the bags 32 being defined by vertical seals 34 spaced along the tubular web 30 .
- the vertical seals 34 stop short of the top of the web 30 , leaving a top strip 36 of a substantially continuous tubular nature existing thereabove.
- a line of perforations 38 extends between each of the vertical seals 34 to allow separation of the bags 32 from the web.
- the perforated line terminates at a horizontal cut or slit 40 that passes through the bottom edge of the top strip 36 where the perforated line 38 terminates.
- These short-length cuts or slits 40 accommodate opening of the bags 32 with substantially square ends, providing for substantially rectangular openings, as will be readily appreciated.
- a seal region 42 is defined beneath the slits 40 and the top strip 36 . This seal region will eventually be sealed by a hot air sealer or the like as will become apparent below.
- markers 46 are uniformly placed along the web 30 , and are shown by way of example as being placed in association with the perforation lines 38 , although any consistent spacing of the marker can be employed.
- a bag finger 48 extends horizontally in communication with the turn bar 14 and is adapted to receive the tubular top strip 36 of the web 30 thereon.
- the top edge 40 is centrally positioned on the bag finger 48 .
- the web 30 is drawn under a guide roller 50 and into a slitting blade 52 that slits the top edge 44 of the tubular top strip 36 to open the bags 32 .
- Cam sprockets 54 are positioned immediately downstream of the slitter blade 52 , each having an associated gripper chain (not shown) thereon.
- gripper chains are well known in the art and are opened by the cam sprocket such that each gripper link opens and closes upon an associated one of the two top strips 36 that result from the slitting blade 52 slitting the top edge 44 . Thereafter, the web of bags 30 is transported by the gripper chain along the processing line.
- a photodetector housing 56 mounted to the support block 58 for the guide roller 50 .
- a photodetector 60 is maintained by the housing 56 and is exposed to monitor the top strips 36 of the web of bags 30 .
- the photodetector detects the markers 46 uniformly spaced along the web of bags 30 and thereby provides a means for facilitating the timing of the opening and separating of the bags as they move along the processing line.
- FIG. 4 there is an illustration of an alternative system for assuring registration of the web of bags, the same being designated by the numeral 62 .
- a pin 64 is positioned to enter the open bag 32 once the top strip 36 has been slit, and to drop down into the bag, opening the bag as it travels under control of the gripper chain.
- the pin 64 is engaged by the seal and rotates a support rod 66 .
- the support rod 66 has a blade or vane (not shown) on an end thereof that rotates past a photodetector 68 , causing the photodetector 68 to emit a signal corresponding to the trailing sealed edge of each bag.
- the photodetector 68 indicates the end of the bag for registration purposes. It also activates an air cylinder 70 that lifts the assembly of 64 , 66 , 68 upwardly, lifting the pin 64 from the bag to be returned into the next succeeding bag for the process to renew.
- a perforation separator made and employed in the context of the invention is designated generally by the numeral 72 .
- the perforation separator 72 is mounted by means of a mounting flange 74 at the station 16 as shown in FIG. 1 , and adjacent to the web of bags 30 .
- the perforator-separator 72 has a pair of opening pins 76 uniformly spaced upon a drive belt 78 mounted on sprockets 80 .
- One of the sprockets 80 is selectively driven by a servomotor or the like 82 , the timing of the actuation of which is timed off of the photodetector 60 through the controller of the control box 24 .
- the servomotor 82 causes a half rotation of the belt 78 , with an associated pin 76 passing through a slot 84 in the plate 86 .
- the slot 84 provides guidance and lateral support to the pin 76 .
- the controller of the control box 24 determines from the signal generated by the photodetector 60 sensing the marker 46 when the servomotor 82 is to be actuated such that a pin 76 can engage the next perforated line 38 .
- the pins 76 travel in a path perpendicular to the path of movement of the web 30 and are of such length and positioning to engage the perforated line 38 at the top thereof at or near the slit 40 and to pass downwardly to completely separate the bags 32 from each other at the perforated line. This occurs sequentially for each perforated line 38 of the bag. Accordingly, the bags 32 are opened at the top and separated from each other but for the continuous top strips 36 , which are engaged and transported by the opposed gripper chains.
- FIG. 6 shows the station 16 with the top cover removed to better appreciate the structure therein.
- the cam sprockets 54 rotate oppositely as designated by the arrows 90 . As they rotate, they open and allow to close the gripping links of a pair of gripper chains, one associated with each sprocket.
- the gripper links engage associated top strips 36 of the web of bags and move the bags through a channel 92 defined between a pair of plates.
- the gripper chain carries the web of bags hanging within the channel 92 until they are struck by an opening pin 76 passing through the slot 84 shown in FIG. 5 .
- the web of separated bags then begins to open as the gripper chains diverge as shown by the chain guards 94 .
- the angularly separating pair of gripper chains thus open the mouth of the bag defined by the top strips 36 by separating those top strips from each other.
- the partial-length slits 40 at the top of the perforation lines 38 allow for this separation and cause the mouth formed by the lips or top strips 36 to be substantially rectangular in configuration, allowing easy access into the bag for articles to be placed therein.
- FIG. 6 Also shown in FIG. 6 is a hydraulic lift mechanism 96 to elevate the entirety of the machine 10 at a desired level of the floor.
- a plurality of supporting feet 98 and associated lift mechanisms 96 are provided about the assembly 10 .
- Work shelves 100 are positioned on either side of an opening 102 through which the opened bags may be accessed for the depositing of materials. This depositing may be done either manually or automatically as with a filler mechanism or the like. It will be appreciated that the gripper chain passes along tracks provided beneath each of the work shelves and the separation of the track may be adjusted as will become apparent below to accommodate various size bags and associated bag openings.
- An emergency stop button 104 is provided at the beginning of the work shelf conveyor area, as shown in FIG. 6 and, with reference to FIG. 1 , it can be seen that an emergency stop button 104 is also positioned at the end of the work shelf area. Actuation of the emergency stop 104 signals the controller in the control box 24 to terminate operations.
- a crank 106 is interconnected with a threaded shaft 108 , which functions as a worm gear.
- the threaded shaft 108 engages a support mechanism for the opposed work shelves 100 and is operative to bring the work shelves closer together to narrow the open space 102 , or to spread them apart to make that space larger. Typically, this movement will be a function of the nature and size of the bags being filled.
- the threaded shaft 108 has one end with a right-hand thread and the other end with a left-hand thread, such that the rotation of the single crank 106 and threaded shaft 108 can cause the shelves to move toward or away from each other, depending upon the rotational direction of the crank 106 .
- a similar mounting arrangement is present at the opposite end of the work shelves 100 , as shown in FIG. 6 , although the corresponding crank 106 and threaded shaft 108 are not shown in that drawing. It is important that the tension on the gripper chains remains constant throughout the operation of the system, and that said tension be the same whether the gripper chains are close together or further apart as under control of the crank 106 .
- a mounting plate 110 receives the cam drive sprockets for the gripper chains, as will be described with respect to FIGS. 8 and 9 , and that mounting plate is received upon a pair of adjustment rails 112 by means of ways or slides 114 .
- An air cylinder 116 is fixed to the plate 110 and, accordingly, to the driven cam sprockets of the gripper chains.
- the air cylinder 116 applies the same constant force to the plate 10 to ensure that the tension in the gripper chains remains constant regardless of the separation of the chains.
- the gripper chain drive mechanism is designated generally by the numeral 118 and includes a motor 120 with a toothed drive wheel driving a double-toothed belt 122 through an arrangement of wheels, and most particularly the sprocket drive wheels 124 .
- the double-sided or double-toothed belt 122 ensures that the pair of sprocket drive wheels 124 rotate in opposite directions and at the same speed.
- a motor gearbox 128 is interposed between the motor 120 and motor drive wheel.
- the attachment block 130 secured to the mounting plate 110 , is provided to attach to the piston rod of the air cylinder 116 , to allow the air cylinder 116 to move the plate 110 upon the ways or slides 114 receiving the adjustment rails 112 .
- air cylinder 116 is adapted to move the entire plate 110 containing the drive mechanism of the cam sprockets 54 at the drive end of the conveyor chain so as to maintain a constant tension in the gripper chain.
- the chain-belt transfer mechanism 132 as a portion of the transfer region 22 , is shown, absent the structure of the chain drive mechanism 118 just described.
- a pair of gripper belt pulleys 134 are each provided with a gripper belt 136 . This is at the end of the gripper chain path of FIG. 9 .
- the web of bags, interconnected by the top strips 36 is passed from the gripper chain interconnection as the cam sprockets release the top strips 36 and transport is continued by means of the gripper belts 136 .
- This is primarily a frictional engagement of the top strips 36 and, for that reason, the support conveyor 20 , shown in FIG. 1 , serves a very useful purpose in this region.
- the web of bags 30 continues to be moved by the gripper belts 136 by appropriate drive means until transferred to sealer belts 138 as shown in FIG. 11 .
- the sealer belts 138 are positioned below the gripper belts 136 , with the sealer belts also being gripper belts associated with the heat sealer 26 .
- the sealer belts 128 secure the web of bags 30 for a coextensive period of time that the gripper belts 136 are also securing the top strips 36 .
- a horizontal trimmer blade 140 positioned between the upper gripper belts 136 and lower gripper belts 138 , slits and trims off the top portions of the top strips 36 .
- both the path and the function of the gripper belts 136 end, the bags now being transported solely by the sealer gripper belts 138 , with top edges of the top strips 36 being exposed thereabove.
- the sealer gripper belts 138 then transport the web of bags through the heat sealer 26 .
- a hot air fan 142 blows hot air through tubes 144 to manifolds 146 .
- the manifolds are spaced apart to accommodate the passage of the top edges of the remaining portions of the top strips 36 where the manifolds blow a hot air stream across the cut tops and melt or fuse them together, thereby sealing the tops of the bags 32 of the web 30 .
- anvil rollers or nip rollers 148 engage the heated top sections of the melted top strips 36 , further completing the fusing of them together.
- the bags 32 are preferably formed of a polyethylene material or other appropriate plastic or polymeric material that can be melted and fused together as just described.
- a servomotor 152 controls drive pulleys 154 to drive the gripper sealer belts 138 .
- the trim winder 28 is shown in FIG. 12 .
- the winder 28 takes up the portions of the two top strips 36 that are slit off of the tops of the bags by the trimmer blade 140 .
- the trim winder 28 comprises a screw rod 156 driven by an appropriate reversible servomotor 158 .
- Mounted upon the screw rod 156 is a carriage 160 , which is threadedly engaged to the screw rod 156 and translatable there across as driven by the motor 158 .
- the carriage 160 is free moving upon a stabilizing guide rod 162 .
- a ring 164 is suspended from the carriage 160 for receiving the trimmed material across a roller bar 166 .
- the trimmed material passes over and is wound about a rotating take-up spool 168 , driven by a motor 170 .
- Photocells 172 are positioned at each end of the guide rod 162 to determine the presence of the carriage 160 .
- the take-up spool 168 is caused to rotate, taking up the trimmed material from the trim blade 140 and passing through the ring 164 .
- the carriage 160 translates across the threaded screw rod 156 until its presence is detected by an associated photocell 172 , at which time the motor 158 reverses direction, causing the carriage 160 to move back across the spool 168 until sensed by the other photocell 172 , at which time the motor direction 158 again reverses such that the carriage 160 translates back and forth across the face of the spool 168 .
- This prevents the trimmed material from bulking up on the spool 168 but ensures that it is uniformly spaced thereon, maximizing the amount that can be taken up on any given spool.
Abstract
Description
- This application claims the benefit of pending provisional application Ser. No. 61/719,000, filed Oct. 26, 2012, by the same title, which is fully incorporated herein by reference.
- The present invention pertains generally to automated packaging and more specifically to automated machinery for opening, inserting product into and sealing a continuous series of bags such as polyethylene bags at a very high rate.
- Automated packaging devices and machines that package various items into polymer-based bags are limited in the number of bags that can be filled at one time or in a single cycle, the amount of weight that each bag can carry in the filling process, and the ability to adjust to accommodate bags of different sizes. Sealing of bags in a continuous operation is typically done as a separate operation which is a serious impediment to speed and total packaging production rate.
- There is a need in the art for a bag loading and sealing system that can operate at high speeds with a continuous web of bags, opening the bags, accommodate filling of the bags, and sealing and separating the bags from each other and the web in a continuous fashion without a need for starting, stopping and indexing the movement of the web of bags along the processing line.
- In light of the foregoing, it is a first aspect of the invention to provide a bag loading and sealing system that runs a continuous web of interconnected bags.
- Another aspect of the invention is the provision of a bag loading and sealing system that sequentially opens the bags and substantially separates them from each other prior to filling.
- Yet a further aspect of the invention is the provision of a bag loading and sealing system that opens the bags with an adjustable gripper chain that is adapted for adjustment to accommodate bags of various sizes.
- Still a further aspect of the invention is the provision of a bag loading and sealing system that opens the bags wide, with a substantially rectangular mouth for ease of filling.
- An additional aspect of the invention is the provision of a bag loading and sealing system that seals the bags with blown hot air to accommodate continuous transport through the sealing mechanism.
- Yet another aspect of the invention is the provision of a bag loading and sealing system that employs a take-up winder for uniformly winding onto a spool a portion of the web of bags trimmed during the transporting and sealing operation.
- Still a further aspect of the invention is the provision of a bag loading and sealing system that is continuous in operation, reliable in performance, and conducive to implementation with state of the art components.
- In one embodiment, the high speed high capacity bag loading and sealing system of the present disclosure utilizes a continuous roll of tubular form polyethylene material or the like, separable in pre-defined sections to define a continuous series of individual bags, opens each bag at one end and establishes registration of the location of each bag in the series, grips and spreads the opposing edges of the upper peripheral end of each opened bag for conveyance along a fill path by dual path gripper chains; the gripper chains transferring filled bags to a pair of opposing transfer belts to transfer each bag from the gripper chain to the transfer belts, the transfer belts interfaced with opposing sealer belts for transfer of each bag from the transfer belts to the sealer belts upon trimming of the opposing edges of the upper peripheral end of each bag with the opposing edges of the upper end of each bag in a closed state, the sealer belts operative to carry each bag to at least one sealing apparatus, the sealer belts and sealer operable continuously and independent of the operation of the gripper chains and transfer belts.
- The system can accommodate bags of many different sizes, different material and material weight, and substantially higher bag content weight by the utilization of gripper chains. The amount of excess material which constitutes the continuous strip at the top of the series of bags is significantly reduced by trimming closely proximate to the gripping region of the gripper chains. Mechanical and/or optical sensing of the precise location of each bag assures registration of the bags with the system throughout the operation. The system can operate at high speeds relative to prior art bag filling equipment, such as at least 100 feet per minute or 200 bags per minute or greater. And the bags can be advanced through the filling station continuously or intermittently, or the filling operation stopped entirely without affecting operation of the sealer.
- For a complete understanding of the various aspect of an embodiment of the invention, reference should be had to the following detailed description and accompanying drawings wherein:
-
FIG. 1 is a schematic side elevational view of a bag loading and sealing system made according to the invention; -
FIG. 2 is an illustration of a web of bags adapted for use with the bag loading and sealing system ofFIG. 1 ; -
FIG. 3 is an illustrative view of the station of the invention for slitting a tubular web of bags open; -
FIG. 4 shows an alternative registration device from that employed in the embodiment ofFIG. 3 ; -
FIG. 5 is an illustrative view of the perforation separator used with an embodiment of the invention; -
FIG. 6 is a top plan view of the station for slitting the bags open, with the cover removed; -
FIG. 7 shows the exit end of the conveyor, with the transfer region and heat sealer next in line; -
FIG. 8 shows the drive assembly for the gripper chain, absent the gripper chain sprocket; -
FIG. 9 shows the assembly ofFIG. 8 with the chain sprockets in place; -
FIG. 10 shows the gripper belt assembly of an embodiment of the invention; -
FIG. 11 shows the heat sealer of the invention in association with an illustration of the gripper belt and heater belt transfer; and -
FIG. 12 is an illustration of the trip winder of the invention. - Referring now to the drawings and more particularly
FIG. 1 , it can be seen that a bag loading and sealing system made in accordance with an embodiment of the invention is designated generally by thenumeral 10. A roll ofbags 12 is shown in association with aturn bar 14 to introduce a web of interconnected bags to the mechanism for opening, filling and sealing them. It will be appreciated that while a roll ofbags 12 may be employed, it is also within the scope of the invention to employ a box of fan-folded bags or the like. The web of interconnected bags is passed to afirst station 16 for slitting the bags open, partially separating the bags of the web from each other, and gripping the open top edges of the bags to transport them through afilling station 18, with the bags having a substantially rectangular opening. Positioned beneath the transport andfilling section 18 is asupport conveyor 20, which may be employed to support the bottom of the bags of the transported web through the filling station and, most particularly, through the sealing mechanism to be described below. The support conveyor ensures that the bags, once filled, are maintained for transport by the gripper chain or gripper belts, as the case may be. At atransfer region 22, the web of bags is transferred from a gripper chain to a first gripper belt and then subsequently to a second gripper belt as will be discussed below. Acontrol box 24, for controlling the motion of theconveyor 20, chain and belt drives, and the like is provided as at 24. Thecontrol box 24 may comprise a dedicated microprocessor or the like, receiving signals from photodetectors and the like later described, and accordingly controlling the movement of the web of bags along the assembly and in appropriate registration. Thesealer system 26 is a hot air system, as will be described herein, but other various types of sealers, such as hot rollers and the like are also contemplated. Finally, atrim winder 28 is provided for retrieving trimmed material from the top of the web of bags that is trimmed off just prior to sealing. - With reference now to
FIG. 2 , an appreciation can be obtained as to the nature of a web or chain ofbags 30 that may be maintained as the roll ofbags 12. The web or chain ofbags 30 is typically of a continuous tubular nature, as will be appreciated by those skilled in the art. Theweb 30 comprises a series of interconnectedbags 32, thebags 32 being defined byvertical seals 34 spaced along thetubular web 30. Thevertical seals 34 stop short of the top of theweb 30, leaving atop strip 36 of a substantially continuous tubular nature existing thereabove. A line ofperforations 38 extends between each of thevertical seals 34 to allow separation of thebags 32 from the web. The perforated line terminates at a horizontal cut or slit 40 that passes through the bottom edge of thetop strip 36 where theperforated line 38 terminates. These short-length cuts orslits 40 accommodate opening of thebags 32 with substantially square ends, providing for substantially rectangular openings, as will be readily appreciated. Aseal region 42 is defined beneath theslits 40 and thetop strip 36. This seal region will eventually be sealed by a hot air sealer or the like as will become apparent below. - Also included as part and parcel of the web of
bags 30 are a series of markers used in association with an optical sensor as will become apparent to allow for registration and control of the movement of bags through the system and particularly the separation of thebags 32 from each other by tearing of theperforation lines 38. Themarkers 46 are uniformly placed along theweb 30, and are shown by way of example as being placed in association with theperforation lines 38, although any consistent spacing of the marker can be employed. - With reference now to
FIG. 3 , an appreciation can be obtained with regard to certain of the structure and features of thestation 16 where slitting the bags open can be attained. As shown, abag finger 48 extends horizontally in communication with theturn bar 14 and is adapted to receive the tubulartop strip 36 of theweb 30 thereon. Thetop edge 40 is centrally positioned on thebag finger 48. Theweb 30 is drawn under aguide roller 50 and into aslitting blade 52 that slits thetop edge 44 of the tubulartop strip 36 to open thebags 32.Cam sprockets 54 are positioned immediately downstream of theslitter blade 52, each having an associated gripper chain (not shown) thereon. Such gripper chains are well known in the art and are opened by the cam sprocket such that each gripper link opens and closes upon an associated one of the twotop strips 36 that result from theslitting blade 52 slitting thetop edge 44. Thereafter, the web ofbags 30 is transported by the gripper chain along the processing line. - Also presented in association with the
slitting blade 52 is aphotodetector housing 56 mounted to thesupport block 58 for theguide roller 50. Aphotodetector 60 is maintained by thehousing 56 and is exposed to monitor thetop strips 36 of the web ofbags 30. The photodetector detects themarkers 46 uniformly spaced along the web ofbags 30 and thereby provides a means for facilitating the timing of the opening and separating of the bags as they move along the processing line. - In
FIG. 4 , there is an illustration of an alternative system for assuring registration of the web of bags, the same being designated by the numeral 62. Here, apin 64 is positioned to enter theopen bag 32 once thetop strip 36 has been slit, and to drop down into the bag, opening the bag as it travels under control of the gripper chain. At the sealed trailingend 34 of the bag, thepin 64 is engaged by the seal and rotates asupport rod 66. Thesupport rod 66 has a blade or vane (not shown) on an end thereof that rotates past aphotodetector 68, causing thephotodetector 68 to emit a signal corresponding to the trailing sealed edge of each bag. Thephotodetector 68 indicates the end of the bag for registration purposes. It also activates anair cylinder 70 that lifts the assembly of 64, 66, 68 upwardly, lifting thepin 64 from the bag to be returned into the next succeeding bag for the process to renew. - With reference now to
FIG. 5 , it can be seen that a perforation separator made and employed in the context of the invention is designated generally by the numeral 72. As shown, theperforation separator 72 is mounted by means of a mountingflange 74 at thestation 16 as shown inFIG. 1 , and adjacent to the web ofbags 30. The perforator-separator 72 has a pair of opening pins 76 uniformly spaced upon adrive belt 78 mounted onsprockets 80. One of thesprockets 80 is selectively driven by a servomotor or the like 82, the timing of the actuation of which is timed off of thephotodetector 60 through the controller of thecontrol box 24. Theservomotor 82 causes a half rotation of thebelt 78, with an associatedpin 76 passing through aslot 84 in theplate 86. Theslot 84 provides guidance and lateral support to thepin 76. - In operation, the controller of the
control box 24 determines from the signal generated by thephotodetector 60 sensing themarker 46 when theservomotor 82 is to be actuated such that apin 76 can engage the nextperforated line 38. Thepins 76 travel in a path perpendicular to the path of movement of theweb 30 and are of such length and positioning to engage theperforated line 38 at the top thereof at or near theslit 40 and to pass downwardly to completely separate thebags 32 from each other at the perforated line. This occurs sequentially for eachperforated line 38 of the bag. Accordingly, thebags 32 are opened at the top and separated from each other but for the continuous top strips 36, which are engaged and transported by the opposed gripper chains. -
FIG. 6 shows thestation 16 with the top cover removed to better appreciate the structure therein. As shown, thecam sprockets 54 rotate oppositely as designated by thearrows 90. As they rotate, they open and allow to close the gripping links of a pair of gripper chains, one associated with each sprocket. As stated above, the gripper links engage associated top strips 36 of the web of bags and move the bags through a channel 92 defined between a pair of plates. The gripper chain carries the web of bags hanging within the channel 92 until they are struck by anopening pin 76 passing through theslot 84 shown inFIG. 5 . The web of separated bags then begins to open as the gripper chains diverge as shown by the chain guards 94. The angularly separating pair of gripper chains thus open the mouth of the bag defined by the top strips 36 by separating those top strips from each other. The partial-length slits 40 at the top of the perforation lines 38 allow for this separation and cause the mouth formed by the lips ortop strips 36 to be substantially rectangular in configuration, allowing easy access into the bag for articles to be placed therein. - Also shown in
FIG. 6 is ahydraulic lift mechanism 96 to elevate the entirety of themachine 10 at a desired level of the floor. A plurality of supportingfeet 98 and associatedlift mechanisms 96 are provided about theassembly 10. -
Work shelves 100 are positioned on either side of anopening 102 through which the opened bags may be accessed for the depositing of materials. This depositing may be done either manually or automatically as with a filler mechanism or the like. It will be appreciated that the gripper chain passes along tracks provided beneath each of the work shelves and the separation of the track may be adjusted as will become apparent below to accommodate various size bags and associated bag openings. - An
emergency stop button 104 is provided at the beginning of the work shelf conveyor area, as shown inFIG. 6 and, with reference toFIG. 1 , it can be seen that anemergency stop button 104 is also positioned at the end of the work shelf area. Actuation of theemergency stop 104 signals the controller in thecontrol box 24 to terminate operations. - With reference to
FIG. 7 , it can be seen that, at the end of the transport and fillingsection 18, there is atransfer region 22 where the gripper chain transport ends and the web of bags is sequentially transferred to pairs of transport belts, as will be described later. Thistransfer region 22 is then connected to the hotair sealer station 26, which will also be discussed below. - As shown in
FIG. 7 , acrank 106 is interconnected with a threaded shaft 108, which functions as a worm gear. The threaded shaft 108 engages a support mechanism for theopposed work shelves 100 and is operative to bring the work shelves closer together to narrow theopen space 102, or to spread them apart to make that space larger. Typically, this movement will be a function of the nature and size of the bags being filled. It will be appreciated that the threaded shaft 108 has one end with a right-hand thread and the other end with a left-hand thread, such that the rotation of the single crank 106 and threaded shaft 108 can cause the shelves to move toward or away from each other, depending upon the rotational direction of thecrank 106. A similar mounting arrangement is present at the opposite end of thework shelves 100, as shown inFIG. 6 , although the corresponding crank 106 and threaded shaft 108 are not shown in that drawing. It is important that the tension on the gripper chains remains constant throughout the operation of the system, and that said tension be the same whether the gripper chains are close together or further apart as under control of thecrank 106. To this end, a mountingplate 110 receives the cam drive sprockets for the gripper chains, as will be described with respect toFIGS. 8 and 9 , and that mounting plate is received upon a pair of adjustment rails 112 by means of ways or slides 114. Anair cylinder 116 is fixed to theplate 110 and, accordingly, to the driven cam sprockets of the gripper chains. Theair cylinder 116 applies the same constant force to theplate 10 to ensure that the tension in the gripper chains remains constant regardless of the separation of the chains. - As shown in
FIG. 8 , the gripper chain drive mechanism is designated generally by the numeral 118 and includes amotor 120 with a toothed drive wheel driving a double-toothed belt 122 through an arrangement of wheels, and most particularly thesprocket drive wheels 124. Again, the double-sided or double-toothed belt 122 ensures that the pair ofsprocket drive wheels 124 rotate in opposite directions and at the same speed. - As shown in
FIG. 9 , a motor gearbox 128 is interposed between themotor 120 and motor drive wheel. Moreover, theattachment block 130, secured to the mountingplate 110, is provided to attach to the piston rod of theair cylinder 116, to allow theair cylinder 116 to move theplate 110 upon the ways or slides 114 receiving the adjustment rails 112. Accordingly, it will be appreciated thatair cylinder 116 is adapted to move theentire plate 110 containing the drive mechanism of thecam sprockets 54 at the drive end of the conveyor chain so as to maintain a constant tension in the gripper chain. - With reference now to
FIG. 10 , the chain-belt transfer mechanism 132, as a portion of thetransfer region 22, is shown, absent the structure of thechain drive mechanism 118 just described. As shown, a pair of gripper belt pulleys 134 are each provided with agripper belt 136. This is at the end of the gripper chain path ofFIG. 9 . The web of bags, interconnected by the top strips 36, is passed from the gripper chain interconnection as the cam sprockets release thetop strips 36 and transport is continued by means of thegripper belts 136. This is primarily a frictional engagement of thetop strips 36 and, for that reason, thesupport conveyor 20, shown inFIG. 1 , serves a very useful purpose in this region. While the weight of full bags may be too much to be supported simply by the frictional engagement with thegripper belts 36, the weight of those bags can be received by thesupport conveyor 20. The web ofbags 30 continues to be moved by thegripper belts 136 by appropriate drive means until transferred tosealer belts 138 as shown inFIG. 11 . As apparent fromFIG. 11 , thesealer belts 138 are positioned below thegripper belts 136, with the sealer belts also being gripper belts associated with theheat sealer 26. The sealer belts 128 secure the web ofbags 30 for a coextensive period of time that thegripper belts 136 are also securing the top strips 36. In that region, where both sets ofgripper belts horizontal trimmer blade 140, positioned between theupper gripper belts 136 andlower gripper belts 138, slits and trims off the top portions of the top strips 36. At this point, both the path and the function of thegripper belts 136 end, the bags now being transported solely by thesealer gripper belts 138, with top edges of thetop strips 36 being exposed thereabove. Thesealer gripper belts 138 then transport the web of bags through theheat sealer 26. - As shown in
FIG. 11 , ahot air fan 142 blows hot air throughtubes 144 to manifolds 146. The manifolds are spaced apart to accommodate the passage of the top edges of the remaining portions of thetop strips 36 where the manifolds blow a hot air stream across the cut tops and melt or fuse them together, thereby sealing the tops of thebags 32 of theweb 30. Exiting themanifolds 146, anvil rollers or niprollers 148 engage the heated top sections of the melted top strips 36, further completing the fusing of them together. For this purpose, it will be appreciated that thebags 32 are preferably formed of a polyethylene material or other appropriate plastic or polymeric material that can be melted and fused together as just described. - Exiting the anvil nip
rollers 148, the path of the white belts terminates at or about thepulley wheels 150 where the bags are released and dropped into an appropriate receiver. As further shown inFIG. 11 , aservomotor 152 controls drive pulleys 154 to drive thegripper sealer belts 138. - The
trim winder 28 is shown inFIG. 12 . Thewinder 28 takes up the portions of the twotop strips 36 that are slit off of the tops of the bags by thetrimmer blade 140. Thetrim winder 28 comprises ascrew rod 156 driven by an appropriatereversible servomotor 158. Mounted upon thescrew rod 156 is acarriage 160, which is threadedly engaged to thescrew rod 156 and translatable there across as driven by themotor 158. Thecarriage 160 is free moving upon a stabilizingguide rod 162. Aring 164 is suspended from thecarriage 160 for receiving the trimmed material across aroller bar 166. The trimmed material passes over and is wound about a rotating take-upspool 168, driven by amotor 170.Photocells 172 are positioned at each end of theguide rod 162 to determine the presence of thecarriage 160. - In operation, the take-up
spool 168 is caused to rotate, taking up the trimmed material from thetrim blade 140 and passing through thering 164. Thecarriage 160 translates across the threadedscrew rod 156 until its presence is detected by an associatedphotocell 172, at which time themotor 158 reverses direction, causing thecarriage 160 to move back across thespool 168 until sensed by theother photocell 172, at which time themotor direction 158 again reverses such that thecarriage 160 translates back and forth across the face of thespool 168. This prevents the trimmed material from bulking up on thespool 168, but ensures that it is uniformly spaced thereon, maximizing the amount that can be taken up on any given spool. - Thus, it can be seen that the various aspects of the invention may be achieved by the embodiments of the invention presented and described in detail herein. While in accordance with the patent statutes, only the best known and preferred embodiment of the invention has been presented and described in detail, the invention is not limited thereto or thereby. Accordingly, for an appreciation of the true scope of the invention, reference should be made to the following claims.
Claims (21)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US14/064,749 US20140116010A1 (en) | 2012-10-26 | 2013-10-28 | High-Capacity, High-Speed Bag Loading and Sealing System |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201261719000P | 2012-10-26 | 2012-10-26 | |
US14/064,749 US20140116010A1 (en) | 2012-10-26 | 2013-10-28 | High-Capacity, High-Speed Bag Loading and Sealing System |
Publications (1)
Publication Number | Publication Date |
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US20140116010A1 true US20140116010A1 (en) | 2014-05-01 |
Family
ID=50545635
Family Applications (1)
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US14/064,749 Abandoned US20140116010A1 (en) | 2012-10-26 | 2013-10-28 | High-Capacity, High-Speed Bag Loading and Sealing System |
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US (1) | US20140116010A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE1025789B1 (en) * | 2017-12-15 | 2019-07-15 | Pattyn Packing Lines Nv | IMPROVED ROLE OF PLASTIC TUBE OIL FROM WHICH POCKETS ARE MOLDABLE |
CN110300034A (en) * | 2019-05-07 | 2019-10-01 | 清华大学 | Network speed measurement method and device based on Web |
CN114834705A (en) * | 2022-04-14 | 2022-08-02 | 浙江辉煌三联实业股份有限公司 | Automatic boxing equipment for chain saw chain |
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WO1992007764A1 (en) * | 1990-11-06 | 1992-05-14 | Thorsted Maskiner A/S | An apparatus for opening and closing laterally coherent, flat bag members for filling thereof |
US5169083A (en) * | 1989-10-19 | 1992-12-08 | Nippon Mining Co., Ltd. | Narrow strip winding method |
US20020144880A1 (en) * | 2001-04-04 | 2002-10-10 | Toyo Jidoki Co., Ltd. | Bag conveying apparatus and a gripper endless chain used in a bag filling packaging machine |
US20020174629A1 (en) * | 2001-05-24 | 2002-11-28 | Automated Packaging Systems, Inc. | Packaging web and process |
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US20080010944A1 (en) * | 2006-07-17 | 2008-01-17 | Hershey Lerner | Packaging machine and process |
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US4680205A (en) * | 1980-07-07 | 1987-07-14 | Automated Packaging Systems, Inc. | Continuous web registration |
US5169083A (en) * | 1989-10-19 | 1992-12-08 | Nippon Mining Co., Ltd. | Narrow strip winding method |
WO1992007764A1 (en) * | 1990-11-06 | 1992-05-14 | Thorsted Maskiner A/S | An apparatus for opening and closing laterally coherent, flat bag members for filling thereof |
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BE1025789B1 (en) * | 2017-12-15 | 2019-07-15 | Pattyn Packing Lines Nv | IMPROVED ROLE OF PLASTIC TUBE OIL FROM WHICH POCKETS ARE MOLDABLE |
CN110300034A (en) * | 2019-05-07 | 2019-10-01 | 清华大学 | Network speed measurement method and device based on Web |
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