ES2452698T3 - Bag making machine and winder - Google Patents

Abstract

Winding machine (300) for a bag or sheet manufacturing machine comprising: an input groove defined between a first and a second input roller (403, 405) and a film path that is directed at least to a winding station, the film path including a first film path to the bolt, a first bolt (437) being located along the first film path to the bolt; characterized in that the film path approaches the first input roller (403) and follows the surface of the first input roller towards the input groove along an arc of at least 10 degrees, at least one film guide (412, 460 ) being arranged along the film path, at least along the arc, towards the inlet groove and beyond along the film path after the inlet groove, where the at least one film guide is lodges in the first entrance roller at least along the arch.

Description

Bag making machine and winder

BACKGROUND OF THE INVENTION

[0001] There are a variety of machines for making bags known for making bags from one

5 continuous film, like a polyolefin film. The machines for making bags, winders and folding machines available in the market include CMD® Models 3113, series 1100, 1500, series 4013RO and other machines described at www.cmd-corp.com. Examples of machines for manufacturing patented bags of the prior art include US patents 6117058, 4934993, 5518559, 5587032 and 4642084 and published US patent 20060084559.

10 [0002] Generally, these machines unwind the film from a roller. The film can be a single film or a folded film or a tube (flat). The bags are formed by placing seals on the film in desired locations. The seals can form the bottom / top and / or the sides of the bag. Perforations may be included indicating the sides or top / bottom of adjacent bags. Other operations can be developed such as separation and / or folding.

[0003] The bag making machine shown in USP 6117058 is owned by the owner of this invention and can be seen in Figure 1. The prior art rotating bag making machine 100 continuously processes a net or film 201 using a oscillating assembly 203, a pair of drum inlet rollers 205 and 206 (203-206 are part of the inlet section), a sealing drum 208, a pair of drum outlet rollers 210 and 211, a sealing layer 213, a pair of entrance rollers to the blade

20 215 and 216, a blade 218 (which could be any other network processor device such as a perforator, knife, die cutter, stamping station or folding station), a part of blade exit rollers 219 and 220 (210- 220 are part of an output section) and a controller 221. The input or debinding section, as used herein, includes the part of the bag making machine where the network is received, such as a set for debinding and a set of roller dancers. The external section, as used here,

25 includes assemblies acting on a network after the formation of seals, such as drills, winders, folding machines, etc.

[0004] The net is provided through the set of dancing rollers 203 towards a forming drum 208. The drum 208 includes a plurality of sealing bars 209. The sealing bars are heated and create the seals that form the net bags. 201. The net 201 is held against the drum 208 (and the sealing bars) with

30 a layer of Teflon® coated. The end bags are formed with a seal from the drum, and the side bags are formed with a pair of seals. The diameter of the drum can be adjusted and / or less than all the sealing bars can be lit to determine the distance between the seals and, therefore, the size of the bag.

[0005] In general, rotary motion machines include a rear rotating blade for drilling between two seals, or next to a seal. The prior art of Figure 1 publishes that network 201, after

35 leaving the drum 208, is directed to the rotating blade 218, which creates a perforation between the bags, or can separate adjacent bags. When the bags are end bags, the perforation is placed close to the single seal so that when the bags are separated, the perforation and the perforated end are the top of a bag and the seal is the bottom of the adjacent bag.

[0006] Controller 221 is connected to the different components to control speed, position, etc.

40 The sensors can be used to detect the impression on the network to form the seals and / or to perform the drilling in (placing it in the correct location with respect to) the seal. In addition, the sensors can detect seals to try to create the perforation in the correct location.

[0007] Many bag machines include a winder after the blade. Examples of prior art winding machines include US patents 4,667,890; 4,695,005; 6186436; Y

45 5899403. Prior art winding machines have a rotating turret with multiple bolts or a single fixed bolt and a net plug. A desired number of bags is wound around the bolt, forming the roller. The roller is then pushed, often using a thrust piston. The roller can be a paper sorter, and unacceptable rollers can be discarded. The prior art describes several ways of properly directing the front end of the roller towards the desired bolt and controlling the winding.

[0008] Prior art multi-bolt winders require turning a turret to move the bolt to the starting and winding position. This adds complexity to the machine and makes air connections difficult. In addition, because the turret rotates, it is used with a thrust piston that scrapes the bolt only over part of its circumference. On the other hand, moving turrets, thrust pistons, and air horns can interfere with each other or collide. Stationary winders are limited in speed due to the time it takes to remove a roller. Prior art winding machines cannot use pneumatic devices in applications above 30 cpm. On the contrary, said winder capable of reaching 40 cpm would require servo-controlled devices.

[0009] Accordingly, a winder with stationary bolts that operate at higher speeds than prior art bolt systems is necessary. Preferably, such a winder could be used with pneumatic devices and could easily receive air connections.

[0010] US 2008/0627279 publishes an apparatus and a method for producing and winding bags. The bag machine includes a unwind section, a training section and a winder. The winder has an inlet slot and two bolts. Each bolt is positioned along the respective one or two alternative film paths. The bolts can be fixed position bolts and the alternative film paths can be predominantly down. A high speed slot can be provided between the input slot and the alternative film paths to separate the rollers or to separate all the bags. An overlap can be included. The rods that travel in an elliptical orbit and / or the air nozzles can be part of the overlap. Air nozzles can also be used to direct the film towards the appropriate alternative path. Conveyor belts along the alternative film paths can be used to guide the film. Static bolts can be used to help bags reach the conveyor belt, or to rotate the last bag. Pop-up tabs and air horns can help start with the roller in the bolt. Paper sorters as well as pneumatic devices can be used.

20 A thrust device that scrapes the bolts substantially over 360 degrees can be used.

[0011] GB1431350 publishes an apparatus for continuously winding a flat plastic tube, composed of interconnected plastic bags, comprising a pair of tube feed rollers followed by a deposit forming a loop and a winding station that includes a pair of automatic and alternately operable winding mandrels each including axially retractable rods respectively, to define the openings allowing the tube to pass through them, the mandrels being driven at a lower speed during winding and at a higher speed during the central change to cut the tube at a location that corresponds to a line of weakness between adjacent bags. In operation, a support that holds a loop-forming roller adjusts in such conjunction with the lever that holds the roller resting on a stop, that a line of weakness is disposed below the disruptive distance and another line of weakness is more it has between the mandrels, after which the winding begins by, for example, the impeller that drives the mandrel at a lower speed. The disruptive distance produces an account that is applied to a counter in turn providing an output signal to a controller for mandrel impellers when a predetermined account is reached. The controller paralyzes the impeller and causes the mandrel impeller to rotate the latter at a higher speed, so that the

The tube is removed from the tank, which when depleted activates a switch to apply a signal to the controller to reduce the speed of the mandrel impulse. Meanwhile, during the highest speed of the mandrel and the extraction of the tube from the reservoir, the tube has been attached to the mandrel and separated from the flat tube wound in the mandrel.

[0012] US2002 / 030135 publishes an apparatus and a method for producing a bag roller, a device for

40 bag feeding is arranged to feed bags one by one to a winding device. The winding device includes a rotating bolt that is positioned to join with each bag separately to wind the bag over it, to construct a bag roller in which the bags are not connected to each other but firmly held. The winding device comprises at least two separate winding stations, each winding station being connected to one or more bag feeding devices; a switch

45 which is placed anterior to the bag feeding device to direct the bags from one winding station to the other when a bag roller has been completed at one of the winding stations.

SUMMARY OF THE INVENTION

[0013] According to a first aspect of the invention a winding machine is provided for a bag machine or a sheet machine as set forth in claim 1.

[0014] According to a second aspect of the invention there is provided a method of winding bags as set forth in claim 9.

[0015] The winder for the bag machine may comprise an inlet slot and two bolts. Each bolt is positioned along one or two alternative film paths.

[0016] The method of winding bags from a continuous film may include feeding the film into the winder and directing the film alternating along the alternative paths to one of the two bolts. Alternations occur after winding a plurality of bags, such as a roller.

[0017] The bag machine may include a unwind section, a forming section and a winder. The winder includes an inlet slot and two bolts, each located along a respective alternate film path.

[0018] The bolts are fixed position bolts in an alternative embodiment.

[0019] Alternative film paths are predominantly later in other embodiments.

[0020] A high speed slot can be provided between the input slot and the alternate film paths.

[0021] The high speed slot operates in an intermittent mode and in a mode of each bag and / or has a user adjustable on the speed, in various embodiments.

[0022] The winder includes an overlap between the input slot and the alternative film paths, in other embodiments. The overlapper may include a plurality of rods that move in a

15 orbit that crosses the first path in at least two locations. The orbit can be generally elliptical. [0023] The overlap includes a plurality of air nozzles in other embodiments.

[0024] The high speed slot has air nozzles arranged to direct the film towards an alternative film path and other air nozzles arranged to direct the film to another alternative film path.

[0025] The winder includes conveyor belts along the alternative film paths in other alternatives. The transport straps can rotate at an end closer to the entry slot.

[0026] The winder includes static bolts along the alternative film paths, which can be bipolar, in many embodiments.

[0027] The winder includes pop-up tabs arranged along alternative film paths in other alternatives.

[0028] The winder includes paper sorters near the bolts in various embodiments.

[0029] The winder is driven with pneumatic air in one embodiment.

[0030] The winder includes thrust devices that scrape the bolts substantially} 360 degrees in other alternatives.

[0031] The winder for the bag or sheet machine may include an inlet slot, a guide or film guides and a bolt or bolts. The film approaches the entrance groove following the surface of an input roller along an arc of at least 10 degrees. The film path passes through the groove and into the bolt. The film guide is arranged along the film path at least along the arc over which the film wraps the input roller and continues along the film path after

35 the input slot. The film guide is housed in the input roller at least along the arc.

[0032] The method of winding bags from a continuous film may include guiding the film with a first input roller and at least one film guide housed in the first input roller, along the surface of the first roller. of entry along an arc of at least 10 degrees. Then guide the film with the film guide and a roller towards the entry slot. Then guide the film to at least one

40 winding station and coil the bags.

[0033] The film guide is motionless and is in contact with the film along the arc according to an embodiment.

[0034] The film guide is also housed below the surface of the roller in the inlet groove according to another embodiment.

[0035] The arc of at least 45, 60 and 90 degrees in various embodiments.

[0036] The winder includes a second bolt and each bolt is placed on an alternative film path in another embodiment.

[0037] A rotating brush is disposed in a location where the film path can follow any alternative film path to direct the film toward a path selected in another embodiment.

[0038] A high-speed slot is located in the film path after the inlet slot and before the brush and / or source of air blown towards the film from one side and / or the other side and deflects the film from the film path to absorb excess film to superimpose adjacent bags in other embodiments. The air sources are located before the rotating brush and after the groove

10 high speed in another embodiment.

[0039] A flange / guide is disposed near the bolt or bolts to remove the rejected bags in another embodiment.

[0040] There are three film guides that extend transverse to the film in another embodiment.

[0041] A second film guide is disposed on the opposite side of the film in another embodiment.

[0042] A sorter for the bag machine may include a conveyor to provide tape to a bolt and two air sources. The tape approaches the bolt from a first direction and passes over the bolt and wraps a roll of bags wound on the bolt. An air source is directed to hold the tape as the tape approaches the bolt. The other air source is directed to push the tape around the roller

20 bags as the tape passes over the bolt, helping the tape wrap the roller. The air source also holds the tape as it wraps around the bag roller, thus helping the tape to wrap the roller.

[0043] The first air source is placed on an air horn arranged to approach and move away from the bolt in an alternative embodiment.

[0044] Other main features and advantages of the invention will be apparent to those skilled in the art upon preview of the following drawings, the detailed description and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

[0045]

Figure 1 is a diagram of the prior art bag making machine;

Figure 2 is a diagram of a prior art winding machine;

Figure 3 is a diagram of a winder in accordance with the present invention;

Figure 4 is a diagram of a sorting winder in accordance with the present invention; Y

Figure 5 is a diagram of an input roller according to the present invention.

[0046] Before explaining at least one embodiment of the invention in detail it should be understood that the invention is not limited in its application to the construction details and assembly of the components shown in the following description or illustrated in the drawings . The invention is possible with other embodiments or can be practiced and performed in various ways. It should also be understood that the phraseology and terminology used here are used for the purpose of describing and should be considered without character

40 limiting. Similar numerical references are used to indicate similar components.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0047] Although the present invention will be illustrated with reference to a particular bag making machine, a method and a winder, it should be understood from the beginning that the invention can also be implemented with other machines, methods and winders, including machines guide tape machines

45 rotating overlay, intermittent machine, sheet machines and other known machines.

[0048] Generally, the present invention is described with respect to a winder that can be used with,

or is part of, a prior art bag making machine for manufacturing a bag roller for easy packaging, transport, delivery and use. The preferred embodiment is described with respect to a bag making machine such as that shown in US 6117058 or commercially available

5 as a CMD® 1270 bag making machine, or a modular bag machine. The invention is contemplated as a winder; a winder and a separator; a winder, a separator and an overlapper; or a whole bag making machine. The overlap, as used herein, includes a device or section that overlaps successive bags. The bag machine prior to the winder is described below, since it may be the prior art machine described above. Other bag making machines can also be used.

[0049] The winder receives the bags formed as a film and can separate them using a high speed slot. The high speed groove as used herein includes a groove where at least one driven roller has a circumferential speed greater than the film speed before the groove. The slot can operate in a mode of each bag or in an intermittent mode to separate the bags only at the beginning / end of the rollers. The mode of each bag, as used here, includes operating for each bag of a roller. He

Intermittent mode, as used herein, includes not operating for each bag inside a roller, but operating only at the beginning or end of a roller, or for a few bags of a roller. The bags can overlap in the mode of each bag.

[0050] When separating, a film splitter directs the film toward one of the two bolts. Each winding bolt is turned by winding the film, which eliminates jamming and allows higher speeds, higher cycle speeds and fewer counting rollers. The film is directed by the diverter along two alternative film paths to one of the two winding pins or stations. The film path, as used herein, is the path that the film follows through the bag making machine or the winder, except for any area where the film accumulates to wind. The alternative film path, as used herein, includes a path followed by the film or bags a part of the time in

25 which the winder is in use.

[0051] The alternative paths are preferably predominantly down, allowing the rejected film or erroneous film transfer to be rejected to the ground in a convenient location. Predominantly down, as used here, includes more vertical (by gravity) than horizontal. Bolts are fixed position bolts. Fixed position bolts, as used here, include

30 bolts that do not move from one location, for example in an orbit, but can rotate.

[0052] When the bolt in use is wound with a complete roller, the front edge of the first bag of the next roller is directed along the other alternative path to the other bolt. Thus, the winder can wind immediately on the other bolt without moving the bolts and without having to remove a roller before winding the next roller.

[0053] Several embodiments use one or more of the following features, which can be used alone, or in many combinations. The air can be used to direct the film as desired and the pop-up tabs and / or an air horn can be used to start the roller. Static fixation can be used to attach the bags to the bolt and bipolar static fixation can be used to attach the tail of the last bag of a roller to the roller. The conveyors can be used to guide the film along the paths

40 alternatives and the conveyor can rotate when the roller becomes larger to accommodate its expanding diameter. A paper sorter can be used and the drying time for the glue can be adapted since the glue can dry while the other bolt is being used. A pushing device can be used to remove the rollers and can substantially scrape 360 degrees around the circumference of the bolt since the bolts are fixed position bolts. Substantially 360 degrees, as used here, includes

45 above the entire circumference except for occasional minor interruptions.

[0054] Returning to Figure 2, a diagram of a prior art winding machine 200 is shown. The winding machine 200 may be posterior along the film path of the bag machine 100 of Figure 1. Many of the Alternatives mentioned above are shown despite the fact that, as mentioned in advance, not all of them need to be included.

[0055] The film 201 travels from the perforator or the blade 218 (Figure 1) to an input slot defined between the rollers 303 and 305 (Figure 2), at least one of which is driven. The input slot leads to or uses the film to feed the winder 200. (The input slot can refer to the entrance of a machine or a section. Here it is used to also refer to the entrance of the winder section). [0056] The preferred embodiment provides a vertical entry of the web through the slot of

55 entry This allows the machine to be used with one hand relative to the operator's side and can also be adapted both to the planes for the left side and for the right side.

[0057] The film 201, after leaving the inlet slot, is provided at a high speed slot between the rollers 307 and 309, at least one of which is driven (the film 201 is provided to other stations directly, or indirectly after leaving the input slot in various embodiments). Preferably the high speed is servo driven and the high speed percentage can

5 easily changed by the user for a wide repetition distance of the perforation, such as from 10 "(25.4cm) to 250" (635cm) without changing parts.

[0058] In an intermittent mode, you can perforate the connected film and separate a bag from the plurality of bags in the successive bag by starting high speed only after completing a certain account. In one mode of each bag there may be an overlap to separate and overlap each bag starting the high speed

10 all the time. (The mode of each bag includes not separating a few bags on each roller). The high-speed slot can help divert the network to the appropriate alternative path by not starting high speed with the last overlapping roller bag. Perforation detection is not required (but can be provided) when separating bags.

[0059] A flap includes 311-315 rods mounted to travel in a generally elliptical orbit that

15 crosses the path of the film 201 at two points (above and below the groove, preferably). Generally elliptical, as used herein, includes a non-circular, non-angular path. The orbit is shown clockwise in Figure 2, where the roller is wound on a bolt 337, located along one of the alternative film paths. The rotor reverses direction and moves the rods counterclockwise when a bolt 338 (located along the other film path)

20 alternative) is being used. The rods push the film sideways and can help separate, although the high-speed groove can be used alone to separate if the overlap is not installed. The rods temporarily accumulate the film to allow overlapping successive bags. Overlapping regions are shown as 317 and 318 and 319 and 320.

[0060] The rods are preferably steel rods with a diameter of 0.5 "(1.27cm) attached to each

25 end with a chain or timing belt, including an impulse chain wheel and a tension chain wheel, preferably servo driven. This reduces the distance the net should jump when it is not attached. An air curtain or series of air nozzles can be used to help the film jump the space created by the mechanical overlapping rods. Alternatives include using air to overlap, using fewer or more rods, using a different orbit, or other known overlaps.

[0061] High speed rollers 307 and 309 preferably include 0.25 "(0.635cm) wide notches over repeated with a 1" (2.54cm) gap along the face of the two sides of the roller , to provide space for a plurality of air nozzles 322-325 in each notch. Air nozzles 222-225 are used to direct the film to the desired bolt. The upper air nozzles 322 and 323 are used to divert the net towards the opposite roller and the lower air nozzles 324 and 325 are used to divert the network

35 down to a nearby conveyor belt 327 or 328, arranged along the film path. As shown in Figure 2, the air nozzles 322 and 325 are turned off and the air nozzles 323 and 324 are on, directing the film 201 towards the bolt 337. The nozzles 322 and 325 are on and the nozzles 323 and 324 they are off when the film is directed towards bolt 338.

[0062] When one roller is complete and the nozzles have been directing the rear edge of the roller to another

40 bolt, the nozzles are then controlled to direct the front edge of the next bag roller towards the other bolt. Thus, the nozzles alternately direct the film towards one of the two paths. The change of trajectories, or alternations, occurs after winding a plurality of bags - a roller. If the separator is in an intermittent mode, then the nozzles perform an alternation after separating. In the mode of each bag (overlapping) perform an alternation after a given account.

[0063] The preferred embodiment publishes that the right and left bolts and associated components are a true reflection of each other, although this is not necessary. Thus, the bolt 338 reels counterclockwise and the bolt 337 reels clockwise.

[0064] The net, as it travels to bolts 337 and 338, is preferably attached to conveyor belts 327 and 328 with a series of round elastic ropes. In addition, one embodiment 50 provides static fasteners 334 and 331 for securing the film to conveyor belts 227 and 228. Static fasteners 330 and 331 can be bipolar static fasteners not only for fastening the film to the conveyor belt, but also for cause the end of the last bag of a roller to grip the roller, turning off the static neutralizer for the last bags. Thus, the invention is prepared to statically fix an end of a last bag on a roller to the roller, to help with the manual handling of the

55 rollers, in the automatic handling of the roller and reduce the need to glue the tail of the last bag.

[0065] Conveyor belts 227 and 228 are preferably a wide belt or a series of narrower belts with a 1 "(2.54cm) gap between them. The space allows a pop-up tongue 340, 341 (one or more in several alternatives) help direct the front edge of the first bag towards the air horn 342, 343 and around the winding bolt The pop-up tabs 340 and 341 direct the film so

5 flashing near the bolt and remove it after transferring the first bag. The space between the belts also allows the use of a glue melting the glue with a lower probability of the glue reaching the conveyor belt.

[0066] Conveyor belt 328 is preferably mounted to pivot at an end closer to the inlet groove and away from the fixed position bolt 338, as shown in broken lines 345, a

10 as the film increases in diameter. A similar shaft is used for conveyor 327.

[0067] Each winding station can have a paper sorter 346, 347. Since a sorter can be used while the opposite winding bolt, two sorters operating each at 20 cpm allow the entire winding machine to cycle at 40cpm. In addition, since there are two winding stations, each running at 20 cpm, pneumatic devices with a total speed of 40cpm can be used.

[0068] Bolts preferably use a sheath designed by CMD® from Teflon® or with a design of glass / chrome beads. In addition, since the bolts are fixed position bolts, they can use a simple thrust device that does not need to rotate and can substantially scrape 360 degrees around the circumference of the bolt to remove the film more easily with less likelihood of locking. The fixed position also allows simple air connections to the bolts.

[0069] Since there are two stations running at 20 cpm (counts per minute), the machine runs at 40 cpm and more time is allowed for inspection, selection and rejection of the roller than is allowed by a machine with a single station 40 cpm

[0070] An embodiment of winder 300 according to the invention is shown in Figure 3 and may include many of the features described above, including two winding stations. The

25 different embodiments can be combined as desired, choosing characteristics of each of the prior techniques that meets the needs of a particular application.

[0071] The winder 300 includes an input groove defined between a pair of input rollers 403 and 405, a high speed groove defined between a pair of rollers 407 and 409 to separate adjacent bags and bolts 437 and 438. Generally, the winder 300 operates consistently with the winder 200,

30 except as described below.

[0072] The film or net 201 approaches the inlet groove by wrapping or following along a part of the surface of a roller 403 before reaching the groove. The film paths on one are equal to or greater than 10, 45, 60 or 90 degrees in various embodiments.

[0073] A plurality of stationary film guides 412, mounted on the clamp 410, are housed in the

35 roller 403. Preferably, the guide surface 412 is leveled with the surface of the roller 403 so that the net travels through the film guides, the ropes (not shown) and the surface of the roller 403. Housed in a roller, as used here, it includes partially or completely residing in the hollow areas of a roller. The gaps may be notches or channels and may have a depth in the preferred alternative embodiment so that the net travels both the film guides and the surface of the roller 403. The guides 412 are

40 preferably constitute metal with a slippery coating and fit tightly on the sides of no more than 0.010 inches (0.0254cm). This allows the film to be placed without being trapped in the spaces between the gaps and the guides 412.

[0074] With reference to Figure 5, an embodiment of the roller 403 with recesses 501 for the film guides 412 and recesses 502 for the cords is shown. This embodiment provides nine guides and two

45 strings In addition, a plurality of ventilation holes 505 (with the recessed end, with a diameter of 1/2 ", 2.54 / 5.08 cm by 1/8", 2.54 / 20.32 cm, depth) are provided to help the film level with the surface of roller 403 (and on film guides 412, not shown in Figure 5). There are corresponding holes on the opposite side (180 degrees away from the holes 501) on the roller 403.

[0075] A film follows the surface of a roller when it generally rests on the surface

50 external and does not require the film to conform to gaps, etc. The film guide, as used herein, includes a structure used to hold and guide the film and does not require driving the film. The surface of a roller, as used herein, is the surface of a roller that is substantially the same distance from the axis of the roller.

[0076] The film guides 412 can be extended with the arc of the roller 403 over which the film anterior to the groove is moved, or they can be more or less extensive. Preferably, the film guides 412 and the arc have sufficient extension to hold or touch the film 201 as it approaches the inlet slot. The inventors have discovered that stationary film guides, along with the

5 approach to the groove from the side so that the film 201 passes over the guides 412, the ropes (not shown) and the roller 403, allow a faster and more stable operation.

[0077] The 412 film guides extend through the entry slot, but are housed just below (1/16 inch, 2.54 / 40.64cm for example) of the surface of roller 403 closest to the path of film in the groove, to allow the input groove to properly tighten film 201. The surface

10 of a roller closest to the film path, as used herein, is the surface of a roller that the film generally follows. Below the surface of a roller, as used herein refers to closer to the axis of the roller than to the surface of the roller that makes contact with the film.

[0078] A plurality of film guides 460 are connected to film guides 412 and mounted on a block 464. Film guides 412 and 460 can be considered continuous film guides. A plurality 15 of guides 462 are mounted on a block 466 and guide the film 201 from the opposite side of the film

201. Film guides 460 and 462 are preferably spaced sufficiently to allow the film to pass easily, with a total of 1/16 inch 2.54 / 40.64cm between them. Guides 460 and 462 are housed in rollers 403, 405, 407 and 409 and in the high-speed and entry grooves are housed below the surface to avoid interfering with the groove (for example 1/32 inch, 2 , 54 / 81,28cm each). The guides of

20 movie 412, 460 and 462 can be one or many individual guides.

[0079] The ropes that wrap the rollers 403 and 407 (and in one embodiment 405 and 409) are also used to move the film. The strings are particularly useful in thin films, such as 6 microns of high density polyethylene, but omitted for some applications, particularly for thicker films.

[0080] The preferred embodiment uses ropes towards the center of the film and guides towards the edges to achieve greater support. For example, with a six-inch (15.24cm) net, an assembly of 3 412 film guides (two of which are close to the edges of the film 201 and one to the center) and two strings are used, each between movie guides More film guides are used for larger films (and / or more ropes can be used if necessary).

[0081] The winder 300 can operate in a continuous mode or an overlap mode. In the overlap mode, the film 201 is separated into adjacent bags by high speed rollers 407 and 409. The rollers 407 and 409 can be intermittently joined together or accelerated intermittently to separate the film 201 into bags. (Other methods for separating adjacent bags can also be used) Figure 3 shows a bag 201 that has been separated from the film 201. When the continuous mode is used the rollers

35 407 and 409 can operate at the speed of the film, be kept separate or as rollers at rest.

[0082] Guides 460 and 462 extend beyond the groove where the bags are separated, to help film 201 jump the space below rollers 407 and 409.

[0083] The overlap requires that the film move down more slowly and that the excess film be absorbed during the overlap. The above-mentioned embodiment (Figure 2) shows an address for

40 separate the film and take the film for overlap. Figure 3 shows another way to absorb excess film for overlap. The rear rollers 411 and 413 move the film slower than the rollers 403 and 405 in the overlap mode (they operate at the same speed as the rollers 403 and 405 in a non-overlap mode).

[0084] Air sources or air nozzles / pipes 404a and 406a (mounted on fasteners 404 and 406)

45 divert the film from its trajectory to absorb the excess film as the overlapping occurs. As shown in Figure 3, the nozzle 404a is active and deflects the film from the film path to the left, thus absorbing the excess film. Deviated from the film path, as used herein, refers to the accumulated bag or film when the bag or film follows a different path to the film path. The nozzle 404a directs air at least partially in a transverse direction and towards

50 the right side of the film in Figure 3. The nozzle 406a directs air at least partially in a transverse direction, but to the opposite (left) side of the film. The nozzles 404a and 406a can each be implemented with multiple nozzles, a single nozzle, and / or an air line.

[0085] The bag 201a then moves into a winding inlet groove between the rollers 411 and 413, which operate at a lower speed to justify the overlap. The preferred embodiment requires a speed reduction of 20%. Ropes 411a and 413a are provided around rollers 411 and 413 to help move and guide the film to one or more rear conveyors 427/428.

[0086] One embodiment provides a single winding station. However, the preferred alternative embodiment of Figure 3 provides two winding stations, each with a bolt 5 437/438, a conveyor 427/428 wrapping a roller 468.

[0087] After leaving the rollers 411 and 413, a bag 201a can be directed towards the desired winding station, a rotating brush 416. The brush 415 is preferably a full-width brush located to touch the strings 411a / 413a and / or tapes 427/428 and in a location where the film path can follow either a first alternate bolt film path toward bolt 437 or a second film path.

10 bolt film towards bolt 438. Figure 3 shows overlapping bags 201 and 202b going to winding station 437, whereby brush 416 rotates clockwise. The preferred embodiment facilitates that the rollers are wound in an alternative manner on bolts 437 and 438.

[0088] After having been adequately directed by the brush 416, the bags 201a and 201b are guided until an optional clamp barrel 422, a hot glue applicator 424 and an optional classifier 426 are passed.

15 (that is, a station or device for applying a band on a roll of wound bags). A pair of 442/433 air horns are used to facilitate the start of the roller. A pair of 450/451 sorting trays direct the wound rollers to the trash, or to the ground, depending on whether they are accepted or rejected. A pair of tongues / strippers 440 and 441 are arranged close to bolts 437/438 to help remove the rejected bags and / or the rejected rollers.

[0089] An embodiment of the classifier 426 is shown in Figure 4 and includes a conveyor 610 wrapping a roller 612, a film protector 619, an air source 616 and an air source 608 mounted on the air horn 343, which cooperates with the conveyor 428 to wrap a belt 601 on a bag winding roller 618 on the bolt 438 (Figure 3). The classifier 426 is shown for the left classifier of Figure 3 and the right classifier will be a faithful reflection.

[0090] As the belt 601 moves along the conveyor 610 towards the roller 618, the belt 601 passes over the top of the roller 618. The nozzles 608 direct the air to the belt 601 and help hold the belt (that is, they hold it so that it does not fall before reaching roller 618. Protector 615 helps prevent belt 601 from wrapping around conveyor 610 and roller 612.

[0091] After the tape 601 reaches the roller 618, the nozzle 616 directs air to push the tape 601

30 forward, around the right side of the roller 618, thereby helping the tape 601 to wrap around the roller 618. As the tape 601 is wound on the roller 618 the air of the nozzles 608 holds the tape as it is roll on the bottom of the roller 618, thus helping the tape 601 to roll on the roller 618.

[0092] The nozzles 608 and 616 may each be unique nozzles, an air line, or each may be a plurality of nozzles. In addition, the nozzles 608 can be mounted on any support and do not need

35 be air horns 433. The nozzles 616 can also be mounted on any support.

Claims (12)

1. Winding machine (300) for a bag or sheet manufacturing machine comprising: an input slot defined between a first and a second input roller (403, 405) and a film path that is directed at least to a winding station, the film path 5 including a first film path to the bolt, a first bolt (437) being located along the first film path towards the bolt; characterized in that the film path approaches the first input roller (403) and follows the surface of the first input roller towards the input groove along an arc of at least 10 degrees, at least one film guide (412 , 460) being arranged along the trajectory of 10 film, at least along the arc, towards the input slot and beyond along the film path after the input slot, where the at least one film guide is housed in the first input roller at least along the arch. 2. The winder according to claim 1, wherein at least one film guide (412) is stationary and is housed in the first input roller (403) at least along the arc so that the film touches the at least one film guide and the first input roller. 3. The winder of claim 2, wherein the at least one film guide (412) is housed in the first input roller (403), in the input groove so that a surface of the at least one guide of film closest to the film path is below the surface of the first input roller closest to the film path; Y 20 where the arc can correspond to at least 60 degrees; or where the arc can correspond to at least 90 degrees. 4. The winder according to claim 3, further comprising a second bolt (438), wherein the first film path to the bolt is a first alternative film path through which the film, after exiting the inlet slot , you can follow the groove of the first alternative path 25 of the film towards the first bolt to be wound on the first bolt (437) and the film path includes a second film path towards the bolt, which is a second alternative film path, a second bolt (438) is placed at along the second alternative film path, whereby the film, after exiting the input groove, can follow the second alternative film path to the second bolt to wind onto the second bolt.

The winder according to claim 4, further comprising a rotating brush (416) disposed in a location where the film path can follow both the first and the second alternative film path and the film is directed towards the first path. of alternative film when the brush rotates clockwise and the film is directed towards the second alternative film path when the brush rotates counterclockwise.

The winding machine of claim 4, further comprising at least a first tongue (440) arranged near the first bolt (437) to remove the rejected bags and at least a second tongue (441) arranged near the second bolt (438) to extract the rejected bags; or where the at least one film guide is made up of at least three film guides (412).

7. The winder of claim 5, further comprising a high speed groove defined between two 40 high speed rollers (407, 409), located along the film path after the inlet slot and before the rotating brush and before the first and second film path, where the film travels from the slot input to the high speed slot, then to the rotating brush (416) and then to one of the first and second alternative film paths. 8. The winder according to claim 7, further comprising a first air source (404a) 45 directed at least partially in a first direction transverse to the film path and a first side of the film, whereby a part of the film deviates from the film path, thus absorbing the excess film for adjacent bags that are overlap; Y where the winder can further comprise a second air source (406a) directed at least partially in a second direction transverse to the film path and a second side of the film, whereby a second part of the film deviates from the film path, thus absorbing excess film from adjacent superimposed bags; and where the first and second air source It can be placed before the rotating brush (416) and after the high speed slot. 9. The winder according to claim 5, further comprising at least a second film guide disposed along the anterior film path towards the inlet groove to near the high speed groove, where the at least one second path guide is arranged on one side 5 opposite of the movie from the at least one movie guide. 10. A method for winding bags from a continuous film comprising: guiding the film with a first input roller (403), then guiding the film to at least one winding station and winding the bags in the first winding station; characterized in that the film is also guided by at least one film guide (412) housed in the 10 first input roller, along the surface of the first input roller for an arc of at least 10 degrees, the film is then guided by at least one film guide and the first input roller towards the defined input slot between the first and a second input roller (405). 11. The method according to claim 10, wherein the conduction of the film with the first roller of Inlet (403) and the at least one film guide (412) includes contacting the film with the at least one film guide and the first inlet roller at least along the arc. 12. The method according to claim 11, wherein the conduction of the film with the first input roller (403) and the at least one film guide (412) includes the continuation of it along the surface of the first input roller, at least along a 60 degree arc; or 20 where the conduction of the film with the first input roller and the at least one film guide includes the continuation of it along the surface of the first input roller, at least along a 90 degree arc. 13. The method according to claim 11, further comprising guiding the film to a second winding station and winding the bags into a second winding station, wherein the film is 25 guides the first winding station until a first bag roller is wound, the film is then guided to the second winding station, until a second bag roller is wound. 14. The method according to claim 13, further comprising rotating a brush (416) clockwise to direct the film towards the first winding station and rotating the brush counterclockwise to direct the film to the second winding station; 30 and where the film can be constituted by a series of bags formed with seals and perforations, comprising separating bags from adjacent bags in the film guiding the film towards a high speed slot; and where the method can also comprise blowing air into the film in a first transverse direction towards a first side of the film to deflect a part of the film from the 35 film path, thus absorbing excess film from adjacent superimposed bags; Y where the method can also comprise blowing air into the film in a second transverse direction towards a second side of the film, which is opposite the first transverse direction, to deflect a part of the film from the film path, thus absorbing the film surplus of adjacent overlapping bags. The method of claim 10, further comprising displacing a tab (440, 441) to remove the rejected bags; or where driving the film with the at least one film guide (412) and the first input roller (403) towards an input slot includes guiding the film between at least a second film guide and the at least one film guide. PREVIOUS TECHNIQUE