Spindle mechanism for protective packaging device

Abstract

Disclosed is a web handling system that includes a spindle having a spindle magnetic coupling portion and a roll core configured for receiving the spindle for mounting thereon and having a roll magnetic coupling portion, wherein the spindle and roll magnetic coupling portions are configured for magnetically attracting each other to hold the roll on the spindle.

Claims

1. A web handling system, comprising: a spindle extending from a base portion, the spindle having: a spindle magnetic coupling portion including a plurality of magnets located on the base portion, wherein the spindle magnetic coupling portion includes a face on the base portion which is defined by a flange from which the spindle extends with the plurality of magnets located on the flange face, the plurality of magnets being permanent magnets, and a spindle mechanical coupler including a plurality of teeth forming coupling features along at least a portion the spindle proximal to the base portion, wherein the plurality of permanent magnets are located between the coupling features, that extend axially along the spindle from the face; and a roll core configured for receiving the spindle for mounting thereon, the roll core having: a roll core magnetic coupling portion that has a magnetic attraction to the spindle magnetic coupling portion, a roll core mechanical coupler that corresponds to and is engageable with the spindle mechanical coupler, wherein the magnetic attraction engages the roll core mechanical coupler and the spindle mechanical coupler axially along the spindle when the roll core is mounted on the spindle and the engagement between the spindle mechanical coupler and the roll core mechanical coupler is operable to transmit torque between the spindle and the roll core, a face operable to mate with the face of the spindle and the roll core face includes the roll core magnetic coupling portions.

2. The web handling system of claim 1, wherein the spindle coupling features corresponds to and are configured for engaging the roll core mechanical coupler for coupling the spindle and core for transmitting torque therebetween.

3. The web handling system of claim 2, wherein: at least one of the spindle and core mechanical couplers includes a magnetic coupling portion.

4. The web handling system of claim 3, wherein the roll core mechanical coupler includes teeth or splines for coupling to the teeth or splines that extend axially along the spindle from the face of the spindle and the roll core teeth or splines include a ferrous material.

5. The web handling system of claim 1, comprising a spindle-biasing element positioned inside of the spindle for biasing the spindle in rotation, the mechanical coupling portions being configured for transferring the bias to the core.

6. The web handling system of claim 5, wherein a web of material is wound about the core, and wherein the biasing element includes a tensioning element configured for rotationally biasing the core against an unwinding of the web from the core.

7. The web handling system of claim 6, wherein the web of material wound about the core is C-folded.

8. The web handling system of claim 6, wherein the tensioning element comprises a motor controlled for maintaining a pre-selected tension in the web as the web is unrolled from the core.

9. The web handling system of claim 8, comprising a sealing mechanism configured for pulling the web from the roll and sealing layers of the web together.

10. The web handling system of claim 6, wherein the tensioning element located inside the spindle is at least one of a brake or a motor.

11. A protective packaging device, comprising: the web handling system of claim 1; and a filling mechanism configured for filling a space between layers of the web with a substance; wherein the sealing mechanism is configured for sealing the web layers to retain the substance between the web layers.

12. The protective packaging device of claim 11, wherein the substance is a foam precursor that is adapted to solidify into protective foam packaging.

13. The web handling system of claim 1, wherein the spindle magnetic coupling portion includes at least one permanent magnet and the roll core magnetic coupling portion comprises sufficient ferrous material for providing a level of magnetic attraction sufficiently strong to hold the core on the spindle during unwinding of the roll, but sufficiently weak to allow the core to be removed by hand force pulling directly on the core.

14. The web handling system of claim 13, wherein the ferrous material is impregnated in a plastic matrix.

15. The web handling system of claim 14, wherein the roll core magnetic coupling portion is molded from a steel-powder impregnated polymer for providing the magnetic attraction to the magnet.

16. The web handling system of claim 14, wherein the roll core comprises a core tube that fits over the spindle, and a core plug associated with the tube, the core plug including the roll core magnetic coupling portion.

17. The web handling system of claim 1, wherein the spindle magnetic coupling portion is proximal to the spindle mechanical coupler.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) While the specification concludes with claims particularly pointing out and distinctly claiming the subject matter that is regarded as forming the various embodiments of the present disclosure, it is believed that the embodiments will be better understood from the accompanying figures, in which:

(2) FIG. 1 illustrates an embodiment of the dispensing system of the present disclosure;

(3) FIGS. 2 and 3 illustrate a rear and front view, respectively of a dispenser system of the dispensing system as in FIG. 1;

(4) FIG. 4 illustrates a base and extendable support assembly of the dispenser system;

(5) FIGS. 5-8 illustrate front perspective views of a bag forming assembly of the dispenser system of the present disclosure;

(6) FIG. 9 illustrates a front perspective view of dispenser apparatus of the bag forming assembly;

(7) FIG. 10 illustrates a portion of a film travel path through the dispenser apparatus in accordance with the present disclosure;

(8) FIG. 11 illustrates a view of an inline pump assembly and hose manager in accordance with the present disclosure;

(9) FIG. 12 shows an angled rear view of the film spindle;

(10) FIGS. 13-15 show various assembly views of the film spindle;

(11) FIG. 16a shows a film roll in accordance with for use on the dispenser apparatus;

(12) FIG. 16b shows a core of the film roll of FIG. 16a;

(13) FIGS. 17a and 17b show a drive side core plug for use with the film roll;

(14) FIG. 17c shows a support side core plug for use with the film roll;

(15) FIG. 18 shows a view of the drive spline of the spindle;

(16) FIG. 19 shows a film roll partially mounted onto the film spindle;

(17) FIG. 20 shows the proximity of the film roll to the spindle base when fully inserted onto the spindle;

(18) FIGS. 21a and 21b show the film spindle in an operational position and an open position, respectively;

(19) FIG. 22 shows a view of the spindle base, the hinge base, and the steel plugs located therein;

(20) FIG. 23 shows a cutaway view of the spindle base, the steel plugs located therein, the hinge base, and the magnets located therein;

(21) FIGS. 24a and 24b show a schematic view of the spindle base;

(22) FIGS. 25a and 25b show a schematic view of the hinge base; and

(23) FIG. 26 illustrates a block diagram of a control system including a controller for use with the present disclosure.

DETAILED DESCRIPTION

(24) With general reference to FIGS. 1-4, the present disclosure is directed to a dispensing system and components therefore. In particular, the present disclosure a foam-in-bag dispensing apparatus 20 used to produce foam-filled bags, and components having application in the foam-in-bag apparatus. Specific aspects of the apparatus 20 are discussed as follows.

(25) FIG. 1 illustrates a preferred embodiment of the dispensing system 20 of the present disclosure, which includes dispenser system 22 in communication with the chemical supply system 23, itself including chemical supply container 24 (supplying chemical component A) and chemical supply container 26 (supplying chemical component B). Chemical hoses 28 (chemical A) and 30 (chemical B), in connection with tubes 31a, 31b (extending into the containers 24,26), provide fluid communication between respective chemical supply containers 24, 26 and in-line pumps 32a, 32b mounted on dispenser system 22 (see FIG. 11). Dispenser system 22 can include in-line pumps 32a, 32b that is in communication with chemical supply containers that are either in proximity (for example, 40 feet or less) to the dispenser system 22 or remote (for example, greater than 40 feet) from where the dispenser system 22 is located. This allows the containers to be situated in a more convenient or less busy area of a plant or other facility wherein the dispensing apparatus 20 is employed, as it is often not practical to store chemicals in close proximity to the dispenser system 22 (for example, 100 to 500 feet separation of dispenser system 22 and chemicals 24, 26 may be desirable in some applications). Thus, it is inherent in the present disclosure that a great deal of versatility as to how the dispenser system is to be set up relative to the chemical source is possible. As a number of installations require that the containers be stored hundreds of feet (for example, 100 to 500 feet or more) away from the system. In another embodiment, where the distance between the containers 24, 26 is shorter, e.g., about 20 feet to about 40 feet, tubes 31a, 31b may be replaced by pumps in containers 24, 26. The pumps 32a, 32b feed chemicals A and B to the system 22 via hoses 28, 30. It will be appreciated that in any embodiment, the chemicals A and B may be fed to the system 22 at its base, at the head, or at any other position of the system 22. The present disclosure is designed to accommodate these long, or short, length installation requirements, as may be present in any particular application.

(26) FIGS. 2 and 3 provide rear and front elevational views, respectively, of dispenser system 22 which includes exterior housing 38 supported on telescoping support assembly 40, which in a preferred embodiment includes a lifter (for example, an electric motor driven gear and rack system with inner and outer telescoping sleeves or a screw mechanism) and is mounted on base 42 (for example, a roller platform base to provide some degree of mobility). Further mounted on base 42 is solvent pump system 32c (shown covered) configured to deliver a solvent cleaning solution from a solvent tank, through the assembly 40, and into the chemical dispenser apparatus (discussed in greater detail below) where such solvent is used to clean the tip of the mixing module (also discussed in greater detail below). Film roll reception assembly 56 preferably extends out from support assembly 48. FIG. 3 further provides a view of first and second control panels 61, 63.

(27) FIG. 4 illustrates base 42 and lifter or extendable support assembly 48 (e.g., preferably a hydraulic (air pressure) or gear/rack combination or some other telescoping or slide lift arrangement or a screw mechanism) extending up from base 42. FIG. 4 also illustrates the mobile nature of base 42 which is a wheeled assembly (wheels 7). Further shown are the connection assembly 6, including a solvent line 6a and electrical connectors 6b.

(28) FIGS. 5-8 generally show aspects of a foam-in-bag assembly or bagger assembly of the present embodiment. The assembly includes frame sections 71, 73 which form a unitary flip door frame, and may be made of extruded aluminum. A rod 70 is fixed to the flip door frame sections 71, 73 and pivots in a hole in plate 66. Driver roller shaft 72, supporting left and right driven or follower nip rollers 74, 76. While in a latched state, the upper ends of frame sections 71, 73 are also supported (locked in closed position) by door latch rod 85 with handle latch 87.

(29) Drive shaft 82 supports drive nip rollers 84, 86. Driven roller shaft 72 and driver roller shaft 82 are in parallel relationship and spaced apart so as to place the driven nip rollers 74, 76, and drive nip rollers 84, 86 in a film drive relationship with a preferred embodiment featuring a motor driven drive roller set 84, 86, driven by motor 80a, formed of a compressible, high friction material such as an elastomeric material (for example, a synthetic rubber) and the opposite, driven roller 74, 76 is preferably formed of a knurled aluminum nip roller set (although alternate arrangement are also featured as in both sets being formed of a compressible material like rubber). In some embodiments, shaft 72 and rollers 74, 76 may be of unitary construction.

(30) Drive nip rollers 84, 86 have slots formed for receiving film wrapping preventing means 90 (for example, canes 90). For example, canes 90 may be employed to prevent the film web from wrapping around the nip rollers 84, 86. FIG. 7 further illustrates bag film edge sealer 169 shown received within a slot 91 in roller 76 and positioned to provide edge sealing to a preferred C-fold film supply. Support portions 94 and 96 extend upward from the nip roller contact location. Support portion 94 supports the dispenser apparatus 92. Support portion 96 includes an upper portion 98 that includes a means for receiving an end of upper idler roller 101. The other end of the idler roller 101 is supported by support portion 100.

(31) Idler roller 101 can preferably be adjusted to accommodate any roller assembly position deviation that can lead to non-proper tracking and also can be used to avoid wrinkled or non-smooth bag film contact. Also, idler roller 101 is preferably a steel or metal roller and not a plastic roller to avoid static charge build up relative to the preferred plastic film supplied. Idler roller is also preferably of the type having roller bearings positioned at its ends (not shown) for smooth performance and smooth, unwrinkled film feed.

(32) Also, FIGS. 5-8 show first (preferably being releasably lockable in an operative position) end or cross-cut/seal support block or cut/seal jaw 116 positioned forward of a vertical plane passing through the nip roller contact location and below the axis of rotation of drive shaft 82. End cut/seal jaw 116, which preferably is operationally fixed in position, in this embodiment has extruded aluminum construction (and is part of the flip door frame) of a sufficiently high strength so that it is not easily deformed over an extended length, and that is of sufficient heat resistance to withstand heat from the heated sealing and cutting elements (for example, a steel block with a zinc and/or chrome exterior plating), and preferably extends between left and right frame structures 66, and 68, but again, like driven shaft 72 and rollers 74, 76. The cut/seal jaw 116 is preferably supported on pivot frame sections 71, 73 and extends parallel with driven shaft 72. In some embodiments, the cut/seal jaw 116 may be of unitary construction with the sections 71, 73. FIG. 5 illustrates block 116 rigidly fixed at its ends to the opposing, interior sides of pivot frame sections 71, and 73 for movement therewith when latch (handle 87 of the latch is shown) is released. The sealing jaw 116 includes an actuator 161. Cut seal jaw operates with complementary jaw 116b, driven by motor 158 along track 117, to hold the film web in place during operation. In one embodiment, a crank is employed to drive the jaw 116b. In other embodiments, a solenoid or other means may be employed. Further disclosed is a vent cutter 162 for venting the bags, cutting wire 163 for cutting the bags, sealing wires 164a and 164b, and longitudinal sealing wires 169. The cutting and sealing wires are heated, with the heat transmitted by the cutting wire 163 to the film being greater than that of the sealing wires 163a, 163b. A PTFE (Teflon) film 166 can be used over the sealing wires 163a decrease the heat transmitted to the film compared to from the cutting wire 163.

(33) Referring to FIG. 9, dispenser apparatus 192 includes a housing 194, motor 80b, and manifold 193. Dispenser apparatus 192 functions to dispense the foam precursor(s), such as chemicals A and B, between plies of a film web 216, and the plies are sealed together and cut to form a bag. In this manner, the dispenser apparatus 192 serves to form the foam-in-bag products as described herein. Shutoff valves 168a, 168b, for chemicals A and B, respectively, are shown in FIG. 7. A dispenser outlet preferably is also positioned above and centrally axially situated between first and second side frame structures 66, 68. With this positioning, dispensing of material (chemicals A and B) can be carried out in the clearance space defined axially between the two respective nip roller sets 74, 76 and 84, 86. Dispenser assembly 192 is preferably supported a short distance above (for example, a separation distance of about 1 to 5 inches and preferably about 2 to 3 inches) the nip contact location or the underlying (preferably horizontal) plane on which both rotation axes of shafts 72, 82 fall. This arrangement allows for receipt of chemical in the bag-being formed in direct fashion and with a lessening of spray or spillage due to a higher clearance relationship as in the prior art. Mixing module 198 mixes chemicals A and B prior to insertion into the web 216, and includes a valve stem 198a actuated by actuator 195, which itself is driven by shaft 199 and motor 80b. Solvent is delivered to the mixing module using solvent line 6a and manifold 6c (shown in FIG. 8). Manifold 6c is provided for a check valve that functions to produce sufficient back pressure in the solvent hose. The mixing module is secured by an attachment means 190 (shown in FIG. 8), which may include one or more screws and pins. The pins also serve to accurately position the mixing module 198 with respect to the actuator 195.

(34) FIGS. 8 and 10 provides a side elevational view of dispenser system 192 and jaw assembly 202, including jaws 116 and 116b, in relationship to film 216 which in a preferred embodiment is a C-fold film featuring a common fold edge and two free edges at the opposite end of the two fold panel. The jaw assembly is configured for driving 116b against 116 with sufficient force to pinch the two film plies to performs the sealing and cutting and to keep the precursors from leaking past the jaws before the sealing is complete. While a C-fold film is a preferred film choice, a variety of other film types of film or bag material sources are suitable for use of the present invention including gusseted and non-gusseted film, tubular film (preferably with an upstream slit formation means (not shown) for passage past the dispenser) or two separate or independent film sources (in which case an opposite film roll and film path is added together with an added side edge sealer) or a single film roll comprised of two layers with opposite free edges in a stacked and rolled relationship (also requiring a two side edge seal not needed with the preferred C-fold film usage wherein only the non-fold film edging needs to be edge sealed). For example, in a preferred embodiment, in addition to the single fold C-fold film, with planar front and back surfaces, a larger volume bag is provided with the same left to right edge film travel width (for example, 12 inch or 19 inch) and features a gusseted film such as one having a common fold edge and a V-fold provided at that fold end and on the other, interior side, free edges for both the front and rear film sheets sharing the common fold line. The interior edges each have a V-fold that is preferably less than a third of the overall width of the sheet.

(35) As further shown in FIG. 10 after leaving the film roll and traveling past the lower idler roller, the film is wrapped around upper idler roller 101 and exits at a position where it is shown to have a vertical film departure tangent vertically aligned with the nip contact edge of the nip roller sets. Because of the C-fold arrangement, the folded edge is free to travel outward of the cantilever supported dispenser system 192. That is, depending upon film width desired, the folded end of C-fold film 216 travels vertically down to the left side of dispenser end section 196 for driving nip engagement with the contacting, left set of nip rollers. The opposite end of film 216 with free edges travels along the smooth surface of dispenser housing whereupon the free edges are brought together for driving engagement relative to contacting right nip roller set (76, 84) for the bag being formed.

(36) Referring to FIG. 11, an inline pump assembly can be used that includes a pump 32a for the feed line of chemical A 28, and a pump 32b for the feed line of chemical B 30. As shown, inline pumps 32a, 32b can, in some embodiments, be housed within and mounted to a hose manager 49, which helps the telescoping column 48 to operate without interfering with the chemical lines 28, 30, and solvent line 6. The hose manager 49 can be mounted to the head of the device or to the upper telescoping portion to move with the head as it is raised or lowered, or alternatively can be mounted to the base of the device or another suitable location.

(37) In operation, a film web 216 is fed to the apparatus 22. Cut/seal jaw 116 and complementary jaw 116b close to hold the film in place as cutting and sealing occurs. Venting holes are cut by vent cutter 162, and chemicals A and B are dispensed between the plies of the film. The jaw 116b is moved to opened, and the film 216 advances by operation of motor 80a and the nip rollers. The filled bag may be removed prior to or after opening of the jaw.

(38) Some additional examples of these foam-in-bag fabrication devices can be seen in U.S. Pat. Nos. 5,376,219; 4,854,109; 4,938,007; 5,139,151; 5,575,435; 5,679,208; and 5,727,370. A further example of a foam-in-bag device is shown in U.S. Pat. No. 7,735,685, the contents of which are herein incorporated by reference in their entirety. Furthermore, an example of a vent cutting device is disclosed in U.S. Pat. No. 7,367,171, the contents of which are herein incorporated by reference in their entirety. The disclosure herein can, in the alternative, be used with any of the foam-in-bag systems discussed above. Furthermore, the present disclosure may be employed on any type of film handling machine (not only foam-in-bag devices, including, but not limited to, air filled pillow making devices, and other void-fill and protective packaging making devices. The disclosure may also be used in connection with other film converting machines or machines that draw a web off a roll, or machines that employ paper or other material rolls, such as those used in paper dunnage protective packaging.

(39) With respect to any of the embodiments above, as shown in FIG. 26, a controller 1000 may be included and configured to control output to the display panels 61, 63, the cutter 166, the sealer 164, the chemical dispenser 192, or a solvent dispenser 189. Input to the controller 1000 may be from the control panels 61, 63, or from one or more inputs 1001, 1002, etc. as will be discussed in greater detail below. Controller 1000 may include, but is not limited to, a computer/processor that can include, e.g., one or more microprocessors, and use instructions stored on a computer-accessible medium (e.g., RAM, ROM, hard drive, or other storage device).

(40) The controller 1000 may also include a computer-accessible medium (e.g., as described herein above, a storage device such as a hard disk, floppy disk, memory stick, CD-ROM, RAM, ROM, etc., or a collection thereof) can be provided (e.g., in communication with a processing arrangement). The computer-accessible medium can contain executable instructions thereon. In addition or alternatively, a storage arrangement can be provided separately from the computer-accessible medium, which can provide the instructions to the processing arrangement so as to configure the processing arrangement to execute certain exemplary procedures, processes and methods, as described herein above, for example.

(41) Further, the exemplary processing arrangement can be provided with or include an input/output arrangement, which can include, e.g., a wired network, a wireless network, the interne, an intranet, a data collection probe, a sensor, etc. The exemplary processing arrangement can be in communication with an exemplary display arrangement 61, 63, which, according to certain exemplary embodiments of the present disclosure, can be a touch-screen configured for inputting information to the processing arrangement in addition to outputting information from the processing arrangement, for example. Further, the exemplary display 61, 63 and/or a storage arrangement can be used to display and/or store data in a user-accessible format and/or user-readable format.

(42) With reference to FIGS. 12-26. A particular feature of the film roll reception assembly 56 is film web (216) tensioning. Providing web tension is beneficial in many applications in which film is withdrawn from a supply roll and converted or otherwise handled, such as in bag filling and making processes. In the embodiment disclosed, a lack of tension may produce slack in the film 216, making it difficult to accurately control web tracking through the system 22. If the film web 216 moves off track, the quality of the product produced by the system 22 may deteriorate. On the other hand, with too much tension, the web 216 can stretch and even break or tear. This may cause problems with any bag making process, and should be avoided where possible. Even variations in web tension between the two extremes (slack web to broken web) can lead to tracking problems. Assembly 56 can be configured to minimize changes in web tension throughout the bag making process.

(43) In operation, the film web 216 is propelled through the system 22 using the pulling power of the two nip rolls 74,76 and 84,86. One of the nip rolls may made of a relatively soft silicone rubber or other suitable material to sufficiently grip the film. The mate to this roller may be made from knurled aluminum or other suitable material, such as other rigid materials or softer resilient materials. The film web 216 is pulled through the nip 74,76 by the contact pressure between these rollers 74,76, such as at the surface speed of the rollers. The friction between the film and the rollers may be increased, due to the knurling or other texture on the aluminum rollers 84,86 pressing against the relatively soft rubber roll surface, so as to minimize or eliminate slippage.

(44) In one embodiment, proper film web tension my be provided through use of one or more web tension motors. The web tension motor may provide torque in opposition to the direction of rotation of the film spindle (in an upstream direction), even though the motor may be driven by the film in the downstream direction of the film, so as to maintain and control the web 216 and to minimize or eliminate slack in the web 216. The web tension motor thus provides a force to oppose the pull on the web generated by the nip rolls 74,76, as the nip rolls 74,76 pull the film off of the roll on the film supply spindle 300 and through the bag-forming system 22. Alternative systems for tensioning the web 216 can be used, such as brakes or other systems to generate drag or otherwise pull against the web or the unwinding of the film supply roll 400.

(45) Further provided on the assembly 56 in connection with the web tension motor 310 may be an encoder, which may be mounted to the motor shaft on the rear housing of the web tension motor 310. The encoder provides feedback on the rotational speed of the film spindle (for example, through inputs 1001,1002) to the machine's command and control system 1000. This feedback is used by the control system 1000 (see FIG. 26) and its algorithms to adjust the power to the tension motor as required to maintain web tension within the desired range in order to prevent the web from going slack, and to prevent damage to the web that would occur in the event of excessive tension. Alternative sensors or mechanisms of controlling the operation of the web tension motor can be used.

(46) In one embodiment, the web tension motor 310, the encoder 312, and all associated spindle drive components may be positioned inside the film spindle, although external arrangements of these can alternatively be employed. As such, space on the inside of the spindle that would otherwise lie vacant is used, and the potential for interference with the operation of the system that may be caused by an exterior-located tension motor is avoided.

(47) Referring to FIG. 12, film spindle 300 is shown without a film roll mounted thereon, and positioned in its operating or home position. This view shows the exemplary cable 302 connecting the web tension motor 310 and its encoder 312, and the fixed knob 301 of the spindle. The spindle 300 has a base 520 that can be fixed to the support column 48 and does not pivot with the spindle shaft 300. As shown in FIGS. 13-15, the encoder 312 is mounted to the rear of the motor 310 in this embodiment. A motor gear box 311 is preferably mounted to a front cap of the motor 310. An output shaft of the gear box 311 is keyed or otherwise associated with the front cap 325 of the spindle 300 or other portion of the spindle for applying torque to the spindle 300. The motor 310 in this embodiment remains fixed as the spindle 300 rotates around it and is attached to the spindle motor mount 315.

(48) An internally located tension motor and encoder has be found to be particularly advantageous to the operation of the dispenser system 22. The tension motor 310 and preferably also the encoder 312 are disposed inside the spindle shaft can be partially or completely enclosed and protected and is thus not likely to get damaged during loading and unloading of the supply roll 400, or of pivoting of the spindle. This is accomplished by using a smaller motor than used on traditional foam-in-bag systems. The spindle can uses a planetary gear box 311 to achieve the drive reduction needed for the smaller motor, which gearbox is itself compact enough to fit within the spindle. In some examples, the planetary gearbox can provide a 3:1, a 4:1, or a 5:1 drive reduction.

(49) The encoder can be a magnetic encoder 312 or another suitable type of encoder or other type of sensor for controlling the motor, although a magnetic encoder is preferred due to its substantially lower cost, smaller size, and increased reliability than most other types. The encoder 312, positioned as described, provides electrical pulses to the control system as the shaft turns. An internally located encoder allows for the use of a magnetic encoder, which would not be possible (due to the risk of damage) if it were located outside of the spindle. An internally located tensioning mechanism also preferably eliminates the possibility of interference with any hoses and cables that may run down the back side of the support assembly 48. These can include the A side chemical line 30, the B side chemical line 28, the main power cable, the A side pump cable, and the B side pump cable. Alternatively, the encoder could be mounted externally. Further, alternative methods of controlling the tension motor can be employed, including known electrical or physical methods.

(50) Referring to FIGS. 16a and 16b, a film web 216 is provided wrapped around the core 410, which in some embodiments may be a heavy duty paper or plastic core. The width of the film roll, in one embodiment, is between 15 inches and 25 inches, and preferably about 19 inches. The full roll diameter, in one embodiment, is between about 8 and 12 inches, and in one embodiment is about 10.5 inches. Depending on the type of wind (centerfold or gusseted) a roll of bagger film 400 will typically contain two to three thousand feet of film web 216, and weigh between 30 and 50 pounds.

(51) The film roll 400 and the spindle 300 have a coupling device 401 the couples the roll 400 to the driven portion of the spindle 300 and the tension motor 310. Preferably, the coupling device 401 is configured for associating the core 410 of the roll 400 with the motor 310 to enable the motor 310 to transfer torque to the roll 400. The coupling device 401 preferably is also configured for retaining the roll 400 in the coupled association with the spindle 300 and motor 310, and more preferably is configured for automatically placing the roll 400 and spindle 300 in the coupled association upon loading of the roll 400 on the spindle 300.

(52) The coupling device 401 of the preferred embodiment includes a roll coupling portion mounted with the roll 400, and preferably the core 410, and a spindle coupling portion 401, that is mounted to the spindle 300. With reference to FIGS. 17a and 17b, a preferred roll coupling portion includes a core plug 430 that is configured to insert into or otherwise connect, and preferably attach, to the end of the core 410. The core plug 430 can be dimensioned to lock into the inner diameter of the core 410, such as by a press fit.

(53) The spindle coupling portion 401 of the coupling device 401 in the preferred embodiment is configured to engage the roll coupling portion 401 when the roll 400 is loaded onto the spindle 300. The core plug 430 shown is preferably the drive side core plug configured for inserting first onto the spindle 300 when the roll 400 is loaded. The core plug 430 preferably has inwardly extending teeth 431, or another engagement feature, around its inner diameter that are configured to mate with the spindle coupling portion 401. In the preferred embodiment, the spindle coupling portion 401 is configured as a drive spine member, and the teeth 431 of the core coupling portion 401 are configured to engage corresponding teeth 421 or other suitable features on the outer diameter of the drive spline member 420, which is also preferably disposed at the base of the film spindle 300. Alternative coupling devices can be used to fix or couple the spindle 300 against relative rotation with respect to the core, although other arrangements can be envisioned in which some degree of slippage is permitted therebetween while still being able to transfer torque from the spindle to the roll. Preferably, the film roll 400 is coupled to rotate in sync with the spindle 300. Alternative coupling methods can be employed, including, for example, spring loaded catches that can be disengaged by pulling the core 410 off the spindle 300. The splines have the tapered tips, tapered in a longitudinal axis with respect to the direction of the spindle 300, that auto align the spline 420 and the core plug 430 into engagement with one other.

(54) In one embodiment, there may be 3, 4, 5, 6 or more directional barbs 433 molded into the outer diameter of the core plug 430. These barbs are directional in the sense that they allow the core plug 430 to slide into the paper core 410 with relative ease, but make it difficult for the core plug 430 to be pulled out. The barbs 433 (along with some optional smaller, parallel splines) also prevent the core plug 430 from rotating inside of the paper core 410. This is relevant to the proper functioning of the bag making system, as it syncs the film roll 400 to the film spindle 300.

(55) A further, support side core plug 470 may be provided in some embodiments, as shown in FIG. 17c. This support side core 470 plug may be installed into the inner diameter of the paper core 410 on the end opposite the drive side core plug 430. Similar to the drive side core plug 430, the support side core plug may include barbs on its outer diameter or another mechanism to affix it to or retain it with the core. The support side core plug has a smaller diameter than the drive side core plug 430, thus preventing backwards installation of the roll 400 on the spindle 300. The smaller diameter at the support side end of the spindle, as shown best in FIG. 15c at 471, results in a stepped configuration of spindle 300 in a preferred embodiment.

(56) In some embodiments, the drive side core plug 430, the support side core plug 470, and the core 410 are separate components that are assembled to form the web support structure of the present disclosure. In preferred embodiments, the drive side core plug 430, the support side core plug 470, and the core 410 form an integral and unitary web support structure.

(57) The spindle 300 and roll 400 may include one or more members that auto-engage the roll on the spindle. In some embodiments, magnets are used on one or both of the base 520 of the spindle 300 (or spline member 420) and the core 410 or the core plug 430. In preferred embodiments, a plurality of small magnets 440, which can be neodymium-iron-boron magnets, for example, are installed at the base of the film spindle 300, preferably in close proximity to where the flat, end face of the drive side core plug 430 engages with the face of the drive spline 420. These magnets 440 can be positioned to contact or to end up in close proximity with the end face (FIG. 17a) of the drive side core plug 430 when it's fully engaged with the drive spline 420 at the base of the spindle 300.

(58) Correspondingly, the drive side core plug 430 or the core preferably includes a material that is magnetically attracted to the magnets 440. In one embodiment, the drive side core plug 430 includes a ferrous material, and can be made of steel, include piece or pieces of a ferrous material, such as stamped sheet steel, or preferably be injection molded from a steel-filled plastic, for example Nylon. Additional magnets could alternatively be used. The steel filler may be provided in the plastic in a powder form so as to blend into the molded polymer matrix. The steel powder in the core plug 430 provides a degree of attraction for the magnets 440, and the magnets 440 are thus able to secure the core plug 430 to the drive spline 420 with force sufficient for normal machine operation, but low enough to allow the core 410 to be pulled off the spindle by hand when the core is empty or if the roll 400 is desired to be changed. The holding force can be adjusted by design through increasing or decreasing the percentage or amount of steel fill in the molded plastic core plug 430, changing the size or configuration of the magnets, changing the magnet material, or changing the number of magnets used. In some embodiments, magnets are provided in both the core 410 and spindle base 520, and in others, one or more magnets are provided in the core, with a ferrous material provided in the base 520. Other types of magnets can be employed, including other types of permanent magnets, or inductors or other electronic magnets.

(59) FIG. 18 shows a closer view of the base of the film spindle 300, where nine of the twelve magnets 440 mounted within the drive spline 420 are visible. These magnets 440 are mounted such that they stand slightly proud of the face of the drive spline 420, so the steel filled core plug 430 will come into direct contact with at least some of the magnets 440 when the roll 400 is mounted on the spindle 300. This zero-gap design maximizes the force available from the magnets, as magnetic attraction is decreased by the square of the spacing so that even small gaps cause a substantial reduction in holding force. Minimizing these gaps allows the design to achieve a given holding force at lower cost, either in terms of lower cost or smaller magnets, the use of fewer magnets, or by reducing the percentage of steel filler in the molded core plug. As such, the film roll 400 can be secured to the spindle 300 without using any moving parts.

(60) FIG. 19 shows the film roll 400 as it slides onto the spindle 300. The drive spline 420 and some of the magnets 440 are visible as the roll 400 has yet to engage with the base of the spindle 300. Once the roll 400 is fully slid on to the spindle 300, the magnets 440 in the base of the spindle hold the film roll 400 securely to the drive spline 420. The drive spline 420 engages with the matching teeth 431 in the drive side core plug 430 to sync the roll to the spindle. The web tension motor, located inside the spindle, can then drive the film roll 400 and control the tension in the film web through the apparatus.

(61) FIG. 20 shows the film roll 400 fully engaged with the drive spline 420 at the base of the spindle 300. There is no gap between the drive side core 430 plug and the spline 420. The magnets 40 in the base pull the core plug in the roll into flush contact with the face of the drive spline 420.

(62) In one embodiment, magnetic force is further used as a means for which to retain or latch a hinged film unwind spindle 300 onto the base of a dispenser apparatus 22. As shown in FIGS. 21a, 21b, and also FIG. 12, film spindle 300 is mounted to the support column 48 of the apparatus, in order to support the film roll 400 in its proper orientation with respect to the apparatus.

(63) The film spindle 300 is hinged to enable rotation about a vertical axis near its base, where it is attached to a machine support column. In one embodiment, film spindle base and hinge assembly 500 will enable rotation of about 150-210, or preferably about up to about 180. The film spindle 300 includes a magnetic latching means to secure the spindle in its home or operating position (FIGS. 21a and 12), where it must be situated during machine operation.

(64) Referring now to FIG. 22, a one, two, or more magnets, which in a preferred embodiment may be a set of four Neodymium (NdFeB) magnets, located in the base of the spindle 300 match a set of four steel plugs 550 in the hinge base 510, to provide a magnetic based holding or latching force that maintains the film spindle 300 in its home position during machine operation. The four round holes, visible on the back of the hinge base 510 are the locations of the steel plugs 550 that are pulled on by matching magnets inside the spindle 300. The steel plugs are secured into their respective holes in the back of the hinge base with an adhesive, for example an epoxy. The hinge base 510 is secured to the column 48 with, for example, machine screws or other connectors. As such, this latching mechanism uses no moving parts, eliminating the need for an operator to manually release a mechanical latch near the base of the film spindle in order to unlatch the spindle, as is found on some prior art devices. The operator can pivot the film spindle towards the front of the machine by merely pulling on the end of the spindle with sufficient force to exceed the hold of the magnets. The magnet latch, however, is provided with enough holding force so it does not come unlatched during normal machine operation and operator use. Other types of magnets can be employed, including other types of permanent magnets, or inductors or other electronic magnets.

(65) The film spindle design disclosed herein, in one embodiment, incorporates a sensor that can detect the spindle in the home position. In one embodiment, a Hall Effect sensor is located in the spindle hinge base 510 which is securely attached to the machine support column 48 and does not rotate with the spindle base 520. The Hall sensor detects the presence of a small magnet embedded into the spindle base 520 when the spindle 300 is in its home position. The Hall sensor in the hinge base 510, in conjunction with the small magnet in the spindle base 520, allows the control system a means to determine if and when the film spindle is in its home position. As such, the Hall Effect sensor can provide a signal to prevent the machine from operating if the film spindle 300 is not in its home position. The control system can be configured so as to go into a shutdown mode and prevent the machine from operating if the film spindle is out of its home position. In conjunction there with, the control system may display, for example on display 63, an alert to the operator, with a shutdown message, that the film spindle 300 is out of position.

(66) FIG. 23 shows a cutaway wherein the positioning of the magnets 540 in the spindle base 520 are shown, in relation to the steel plugs 550 in the hinge base 510. They are located sufficiently proximate to one another so as to provide the desired attractive force. In other words, the spacing between the magnets 540 and the steel plugs 550 has been minimized to maximize the holding force. In some embodiments, both the spindle base 520 and the hinge base 510 may be machined from aluminum, which has a minimal attenuation on magnetic flux fields. Alternatively, the magnets and the ferrous material can be reversed in position, or magnets can be used on both sides 510, 520.

(67) FIGS. 24a and 24b show a schematic representation of the spindle base 520, including the four magnets 540, and a hinge portion 525 for connection with the hinge base 510. FIG. 24a shows the spindle facing side thereof (with spindle reception portion 526 shown), and FIG. 24b shows the column facing side, which includes a small magnet 530 for detection by the Hall Effect sensor. The small magnet shown as item 530 is embedded into the spindle base 520 where it can be sensed by the Hall Effect Sensor in the hinge base 510, and used to determine if the film spindle 300 is in its home position or not. As this magnet is only used as part of a proximity sensing system, it can be much smaller than the magnets used to secure the spindle in its home position. Reference is also made again here to FIG. 14b, where an exploded view of the spindle 300, its base 520, and the magnets 540 are shown.

(68) FIGS. 25a and 25b show a schematic representation of the hinge base 510, including the four steel plugs 550, and a hinge portion 526 for connection with the spindle base 520. FIG. 25a shows the column facing side thereof, and FIG. 25b shows the spindle facing side thereof, including the positioning of the Hall Effect sensor 560. Any suitable Hall Effect sensor can be used with the present disclosure, however it has been found that the Honeywell Hall Effect Sensor SR13C-A1 is preferable.

(69) The terms substantially or generally as used herein to refer to a shape is intended to include variations from the true shape that do not affect the overall function of the device. The term about, as used herein, should generally be understood to refer to both numbers in a range of numerals. Moreover, all numerical ranges herein should be understood to include each whole integer within the range. The terms front, back, upper, lower, side and/or other terms indicative of direction are used herein for convenience and to depict relational positions and/or directions between the parts of the embodiments. It will be appreciated that certain embodiments, or portions thereof, can also be oriented in other positions.

(70) While illustrative embodiments are disclosed herein, it will be appreciated that numerous modifications and other embodiments can be devised by those of ordinary skill in the art. Features of the embodiments described herein can be combined, separated, interchanged, and/or rearranged to generate other embodiments. Therefore, it will be understood that the appended claims are intended to cover all such modifications and embodiments that come within the spirit and scope of the present disclosure.