Abstract:
An apparatus for transferring material winding between spools. The apparatus includes spindels for positioning first and second spools in a co-planar arrangement with parallel axes of rotation. With the material initially secured to the base of a first spool with tape, a winding mechanism is energized to turn the spools. When the first spool is filled, a first sheave directs the incoming material to the second spool which is rotated at the rate of material supply. A tape applicator is then directed to apply a section of tape over the material, pressing it against the base of the second spool. A small wire is included on the base of the tape being applied. The applicator force on the wire against the material is designed to be sufficient to sever the material, separating the material on the first spool from the material being wound on the second.

Description:
This application claims priority from U.S. Provisional Patent Application Ser. No. 60/350,592 filed on Jan. 18, 2002. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to methods and apparatus for continuous winding of material at high speeds, and more particularly to an apparatus for transfer of material winding between spools wherein the spools are positioned in a co-planar configuration providing for material transfer to be accomplishing without crossing over a spool flange. 
     2. Description of the Prior Art 
     In order to maximize the economy of manufacture of elongated, spool wound material, it is necessary to configure the manufacturing process to allow continuous operation while transferring winding from a filled spool to an empty one. Shutting down the winding process to transfer between spools is time consuming and in some cases detrimental to product quality. For example, in the case of optical fiber production, the fiber is pulled from a molten billet of quartz by an apparatus called a draw machine. Disrupting or stopping the process is costly, since the drawing operation, once disturbed, must be started slowly and ramped back up to production speed. In addition to the lost time, material is wasted because the fiber made during the speed-increase ramp is largely thrown away. Because of this inefficiency, systems have been designed to accomplish a “flying transfer” wherein the fiber is wound onto an empty spool without stopping the drawing operation. U.S. Pat. No. 4,798,346 by Meyers et al. describes one such system wherein each spool has a mechanism called a collector. Meyers refers to the collector as a storage and clamping assembly, item 47 in reference to FIG. 7 of Meyers. The collector is embodied as two disk-like structures about the same diameter as the spool upon which the fiber is being wound. The collector disks are positioned adjacent a flange of each spool and rotate on the same axis as the flange and at the same velocity. Two spools are positioned in axial alignment, with their collector apparatus facing each other. During the winding process, both spools and collection assemblies are rotating at the same velocity. When the winding of fiber on one spool is complete, the distributor leads the fiber over the flange of the first spool and onto the collector assembly of the second spool. At this time the collector disks of the empty spool are open/spaced apart. A portion of the fiber is wound on an array of pins between the disks, whereupon the disks are clamped, securing the fiber. The distributor then guides the fiber over onto the empty spool and winding continues. A cutter is then extended to sever the fiber between the two spools, freeing the full spool for removal and replacement with an empty spool. 
     A variation of the collector system has the two spools radially offset. In this case, when the distributor moves the fiber onto the collector of the new spool, the fiber is clamped and quickly breaks due to the stretching action caused by relative motion of the collectors of the full spool and empty spool. A cutter bar can also be used in the system to sever the fiber between the spools. Once the fiber is broken, the transfer proceeds in the same manner as with axially offset systems. 
     Another variation of the collector system employs a snagger button mounted into the rotating portion of the spindel turning the spool. Upon transfer from a full spool to an empty spool, the distributor leads the fiber over the spool flange to the snagger button corresponding to the empty spool. On the next rotation of the spool, the snagger button snags the fiber and begins wrapping it around the empty spool. A cutter bar is extended and the fiber between the spools is cut. 
     A disadvantage of the above described methods of transferring fiber between spools is that the speed of the spools during transfer is not constant. The speed varies as the fiber is moved over the spool flanges and onto the base of the empty spool. In some designs, slots are cut in the flange for passing of the fiber in order to reduce the disturbance in fiber speed when the distributor leads the fiber over the flange. The slot, however, weakens the spool and increases its tendency to flex and distort, damaging the quality of the wound package. Both the collector mechanism and the snagger mechanism introduce large disturbances in the speed of the fiber as the fiber is suddenly grabbed. These sudden disturbances in the speed of the fiber greatly increase the tendency of the fiber to break, resulting in a costly shutdown of the fiber drawing machine. Another problem with both the collector and snagger mechanisms is that they occasionally fail to successfully transfer the fiber, again causing a costly shutdown of the fiber drawing machine. Furthermore, this tendency to miss/fail increases as the speed of the fiber increases. Given the unrelenting quest for higher drawing speeds, this tendency is clearly at odds with reliable high-speed machines. 
     SUMMARY 
     It is therefore an object of the present invention to provide a more reliable method and apparatus for transferring winding of material from one spool to another while maintaining a continuous winding operation. 
     It is a further object of the present invention to provide a method and apparatus for transferring winding of material between spools that does not require passing, the material over a spool flange. 
     It is another object of the present invention to provide a method and apparatus providing a flying (during winding) transfer of winding material between two spools that does not substantially disturb the material. 
     It is an object of the present invention to provide a method and apparatus for transferring winding between two spools that adheres the material to the base of the empty spool and severs the material in a single operation. 
     It is a still further object of the present invention to provide a method and apparatus that does not cause or require the spools to change speed during transferring of winding between spools. 
     Briefly, a preferred embodiment of the present invention includes an apparatus for transferring material winding between spools. The apparatus includes spindels for positioning first and second spools in a co-planar arrangement with parallel axes of rotation. With the material initially secured to the base of a first spool with tape such as adhesive tape or a similar product, a winding mechanism is energized to turn the spools. When the first spool is filled, a first sheave (grooved wheel/pulley) directs the incoming material to the second spool which is rotated at the rate of material supply. A tape applicator is then directed to apply a section of tape over the material, pressing it against the base of the second spool. A small wire is included on the base of the tape being applied. The applicator force on the wire against the material is designed to be sufficient to sever the material, separating the material on the first spool from the material being wound on the second. 
     An advantage of the present invention is that it avoids the need to move the material across variable diameters that cause speed changes. 
     A further advantage of the present invention is that it does not require moving the material over a spool flange and into a collector mechanism. 
    
    
     
       IN THE DRAWING 
         FIG. 1  is an illustration for description of a system incorporating a preferred embodiment of the present invention; 
         FIGS. 2(   a ) through  2 ( j ) illustrate actuator apparatus for positioning the material placement rollers and the tape and cutter apparatus; and 
         FIG. 3  shows a sequence of positions of the material positioning apparatus and tape apparatus in the transfer process; 
         FIG. 4  is a planar view of a sketch of a production apparatus for performing the operations of the high speed take-up apparatus described in reference to  FIGS. 1–3 ; 
         FIG. 5  illustrates a spool loading and unloading apparatus; and 
         FIG. 6  is a flow chart for illustration of the operation of transfer of winding from one spool to another spool. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring now to  FIG. 1  of the drawing, there is illustrated a system  11  including a preferred embodiment of the high speed take-up apparatus  10  of the present invention, shown with material  12  being fed into the apparatus  10 . The material  12  is drawn from a heated preform  14  in a draw tower  16 . A material buffer  18  provides guidance by a capstan apparatus  20 , and tension accommodation with a dancer mechanism  22 . The take-up apparatus  10  includes spool drive shafts  24  and  26  for turning first and second spools  28  and  30  respectively.  FIG. 1  shows the apparatus  10  in the process of winding material  12  onto spool  28 . When the spool  28  is nearly filled, a material positioning apparatus  32 , including sheaves  34  and  36 , moves to position the material  12  against the base  38  of spool  30 . Similarly, when the material  12  is attached to and winding on spool  30  and it is necessary to transfer to spool  28 , the apparatus  32  moves the position of the incoming material  12  adjacent base  40  of spool  28 . The movement of positioning apparatus  32  will be fully illustrated in reference to the following figures of the drawing. The take-up apparatus  10  includes one or two tape and cutter apparatus, illustrated symbolically as items  42  and  43  for attaching the material  12  to the base of the adjacent spool. In the preferred embodiment, a single tape and cutter apparatus  43  is used that is moved from the position as indicated in  FIG. 1 , to the position indicated by item number  42  through use of an apparatus that moves the tape and cutter apparatus from one position to the other and rotates it 180° as shown in  FIG. 1 .  FIG. 1  also shows a controller  45  interconnected through bus lines  47 ,  49  and  51  to apparatus  16 ,  18  and  10  for controlling the various operations as required. 
     In operation, the material  12  is drawn from the preform  14 , and is typically guided by an apparatus such as buffer  18  to positioning apparatus  32 . The material is initially attached to the base of a spool, for example, base  40  of spool  28 . The process could also begin by attachment and winding on spool  30 . The drawing process and winding on spool  28  then proceeds at a uniform rate until spool  28  is nearly full, at which point, the positioning apparatus  32  positions the material  12  so as to pass in proximity with the base  38  of empty spool  30 . A tape and cutter device such as  43  then moves to the spool base  38 , whereupon a length of tape with a wire preferably attached is ejected and pressed against the material  12  and base  38 . The tape secures the material to the base. The length of wire adhered to the tape lies substantially perpendicular to the direction of the material  12  movement, and the pressing of the wire against the material  12  fractures or otherwise severs it. At this point, the spool  30  is spinning and winding the material. The spool  28  is stopped, removed, and replaced with an empty spool. When spool  30  is nearly full, the transfer process is repeated. The positioning apparatus  32  moves the material adjacent the base  40 . The applicator-cutter as indicated by item number  42  as described above, moves into contact, and the tape is secured and the film severed from spool  30 . The apparatus of  FIG. 1  is preferably designed/optimized for winding optical fiber. The present invention also includes the apparatus of  FIG. 1  designed for winding any of a variety of materials, and these will be apparent to those skilled in the art. 
     The sequence of operations is more clearly described in reference to the illustrations of  FIGS. 2   a–j.    
       FIG. 2   a  shows spool  30  as empty, and spool  28  as full, or in practice nearly full, since some time must be allowed for the transfer operation, during which the material will continually be wound on spool  28  until the material  12  is cut. The material positioning apparatus  32  is indicated by sheaves (grooved wheel/pulley)  34  and  36 , and the tape and cutter apparatus as items  42  and  43 . The sheaves  34  and  36  are positioned preferably approximately equidistant from the two spools  30  and  28  during the majority of the time while winding on a spool, which is a position providing a more direct path for the fiber in reaching the spool than in the more extreme positions required during the transfer of fiber winding from one spool to another. This intermediate point is indicated in  FIG. 2   b  by the dashed line labeled “mirror line”. The mechanism/apparatus required for moving the sheaves  34 ,  36  and tape and cutter apparatus  42  and  43 , and other details are not shown in order to simplify the illustration. The mechanical devices required will be described in subsequent figures of the drawing to the extent necessary for someone skilled in the art to reproduce the invention. 
       FIG. 2   a  shows spool  28  nearly full of winding  64  of material  12 . The system  11  includes apparatus (not shown) for inputting data to, the controller  45  sufficient,to allow the controller, programmed accordingly to calculate the speed of the fiber  12 . The controller also is programmed to calculate the amount of fiber wound on a spool, and when a spool is nearly full of material  12 , the controller  45  directs movement of the positioning apparatus  32  to a position as shown in  FIG. 2   b  wherein the material  12  is in contact with the base of spool  30 . The controller, being programmed to know the speed of material  12  delivery, is also programmed to direct the rotational speed of the base  38  of spool  30  to substantially equal the speed of the material  12  so as to avoid material speed change during the transfer. In practice, a slight difference in the speeds may be desirable in order to maintain tension between the spools when cutter apparatus  43  is pushing material  12  against base  38 . The controller, for example can be programmed with the diameter of winding  64  when the detector  66  signal is received by the controller, and also with the speed of rotation of spool  28 . From this information and the diameter of spool  30  base  38 , the controller can be programmed to set the necessary speed of rotation of spool  30 . The controller also directs apparatus to move the tape and cutter apparatus  43  towards the spool  30  base  38 .  FIG. 2   c  shows the tape and cutter  43  with the tape roller  74  pressing against the material  12  and base  38  of the spool  30 . The situation as shown in  FIG. 2   c  can be attained in either of two procedures as follows. The tape and cutter apparatus  43  can first be moved a distance from the eventual point of contact between the apparatus  43  and the fiber  12 , for example as shown in  2   b . When the positioning apparatus  32 , moving parallel with the axis of rotation of the spools  30  and  28 , brings the fiber into the position at which transfer is to take place, the tape and cutter apparatus  43  is moved rapidly into the cutting and taping position as shown in  FIG. 2   c , with the roller  74  pressing the fiber  12  against the spool  38 . A more preferred method of operation, however, is as follows. The wheel  74  of the tape and cutter apparatus  43  is moved into contact with the spool  38  prior to arrival of the fiber  12 . The edge of the roller  74  of the apparatus  43  is constructed with a taper/bevel so that when the fiber is pressed against the roller and spool  38  by the apparatus  32  running parallel with the axis of rotation of the spool  38  and apparatus  43  roller  74 , the fiber moves between the roller  74  and spool  38 . At this point, the apparatus  43  then proceeds with the cutting and taping operation, as will now be more fully described. At this point in time the tape and cutter  43  is directed by the controller to dispense a section of tape with a wire attached. The roller  74  then presses the tape and wire against the material  12  and base  38 . The pressure of the wire fractures/severs the material  12  and the tape secures the material to the base  38 .  FIG. 2   d  shows the result in a view with the obscuring flange  77  partially cut away as indicated by the letter “A”, for more clearly showing the apparatus  43  and tape  78  and wire  79 . The tape  78  is adhering the material  12  to the base  38  and the material  12  is therefore now winding on the spool  30 . The severed material  12  portion  80  is now free of the winding process and the spool  28  can be stopped and unloaded, as shown in  FIG. 2   e . The positioning apparatus  32  is shown in  FIG. 2   e  moved to the more neutral position, minimizing the stress on the material  12  as the winding of spool  30  continues. The applicator/tape and cutter  43  is shown in solid lines moved out of the way of positioning apparatus  32 . This can be accomplished in various ways, including movement to the position as illustrated. In a preferred embodiment this is accomplished by moving the applicator  43  in a direction parallel with the axis of rotation of the spools, taking the apparatus  43  out of the plane of movement of the material  12 . This is indicated by the arrow end  82  of the apparatus  43  shown in  FIG. 2   e.    
     The full spool  28  is replaced with an empty spool  84 , as shown in  FIG. 2   f . As shown in  FIG. 2   g , when the windings  86  reach a predetermined level, the controller directs the positioning apparatus  32  to move the material  12  into contact with the base  88  of spool  84 , which has been brought to the required speed to match the speed of the material. The controller then moves a second applicator  42 , or applicator  43  as explained above in reference to  FIG. 1 , into contact with the material  12 , and a tape and wire is dispensed, as illustrated in  FIG. 2   h , showing the fiber  12  and apparatus  42  in solid lines due to cutaway of the spool flange in area B. As shown in  FIG. 2   i , the material  12  is fractured/cut by wire  91 , and a tape section  94  adheres the material  12  to the base  96  of spool  84 . The spool flange is cut away for clarity of illustration in area C. The applicator  42  is then moved out of the path of the material  12  as indicated by arrow  98  and the positioning apparatus  32  moves again to a more neutral position as shown in  FIG. 2   j . The full spool  30  can then be removed and replaced with an empty spool. The process of  FIGS. 2   a–j  then can be repeated until all the material  12  has been wound on spools. 
       FIG. 3  is an enlargened partial view for illustration of the application of the tape and cutter material. Material  12  is shown in contact with the base  102  of a spool  100 . An applicator  104 , similar to applicators  42  and  43  of  FIGS. 1 and 2 , has a roller  106  and a tape dispenser  108 . When the roller  106  contacts the material  12 , the dispenser  108  is directed to eject a length of tape  110 , which has attached a laterally oriented length of wire  112 , lying perpendicular to the direction of movement and length of the material  12 . The dispenser tape ejection mechanism is not shown, but will be understood by those skilled in the art. The dispenser  108  includes apparatus for ejecting a particular length of tape, and can include a tape cutting apparatus for that purpose. The tape is drawn by the roller  106  and friction with the moving material  12  and base  102 . The pressure,and flexibility of the roller  106  material is such that the roller forms around the wire and material so as to pressure and adhere the tape  110  against the base  102 . The pressure of the wire against the material  12  causes the material  12  to fracture, as indicated by line  114 . The incoming material  12  at position  116  is then adhered to and wound on the base  102 . The severed material  12  at  118  is then free to be removed along with the spool to which it is attached. Although the apparatus  42  and  43  as illustrated in  FIG. 3  uses a wire to sever the material  12 , this is a preferred embodiment that is particularly applicable when the material  12  is an optic fiber. The present invention also includes the apparatus  42  and/or  43  designed to cut the material  12  by other methods that will be apparent to those skilled in the art upon reading the above description. For example, a synchronized cutter blade (not shown) can be used for cutting a variety of types of material  12 . 
       FIG. 4  is a planar view of a sketch of a production apparatus  120  for performing the operations of the high speed take-up apparatus  10  described in reference to  FIGS. 1–3 . A housing  122  is shown with first and second spools  124  and  126  installed and held in place and rotated as required by apparatus partially shown at  128  and  130 . A distributor  132  is shown for performing functions as described in reference to the positioning apparatus  32  of  FIG. 1 . A sheave  134  is visible in  FIG. 4 , as well as a horizontal gantry  136  for moving the sheave(s)  134  horizontally. A vertical gantry for moving the sheaves vertically is also included, but is hidden behind the housing  122  and is indicated only as line  138 . A tape and cutter apparatus  140  is shown including a roller  142  (corresponding to roller  74  of  FIG. 2   c ) and tape dispenser  144  with a tape feed point  146 . A linear thruster  148  moves the tape dispenser  144  and roller  142  forward and backward as required to position the dispenser  144  adjacent a spool base as described above. The apparatus  140  includes a 180° rotation cylinder apparatus  150  for rotating the tape dispenser  144  and roller  142  as required to be positioned as described in reference to  FIG. 1  and  FIGS. 2   h  and  2   i . The apparatus  140  is rotated by a pivot apparatus  152  about pivot point  154  in order to move the apparatus  140  out of the operating area of the distributor  132  apparatus as required. 
     The apparatus  120  of  FIG. 4  also includes spool loading and unloading facility, as indicated by loading apparatus  156  in  FIG. 5 . The apparatus  156  has two arms  158 , with each arm for gripping one of two ends of a spool. Due to the planar view of  FIG. 5 , only one arm is visible as the other arm on the other side of spool  160  is behind arm  158 . The apparatus has an arm drive  161  that is positioned equidistant from the spool positions  162  and  164  indicated by the dashed circular lines. The drive  161  is also the same distance to position  165  of a semi-circular receptor  173  on cart  166  when the cart is in a pre-determined aligned/secured position to the housing  122 . The, alignment of the cart to the housing  122  is symbolically indicated by a pin  169 .  FIG. 5  also symbolically shows two shrouds  170  and  175  for shielding the spools during the process of fiber winding. For loading and unloading, the shroud covering the accessed spool is retracted. Details concerning the construction and operation of shrouds will be apparent to those skilled in the art upon reading the present disclosure. 
     In operation, after the system transfers winding to an empty spool, rotation of the full spool is stopped and a notice is given that a spool is ready to be replaced. The corresponding shroud over the full spool is retracted, and an operator installs the cart  166 , aligning/securing it in position. The controller then directs the loading and unloading apparatus  156  to grasp the spool to be unloaded. This is done with extendable fingers on the arm ends  171 . If the full spool is at position  162 , for example, the arm  158  rotates to that position and grasps the spool. Head and tail stock for rotating the spool are disengaged, and the arm delivers the spool to the cart spool receptacle  173  at  165 . A reverse operation applies for installing an empty spool at position  162 . The operation is similar for loading and unloading a spool to and from location  164 . 
     The operation of the transfer of winding from one spool to another will now be described in reference to the flow chart of  FIG. 6 . Transfer begins with some form of activation (block  174 ), which can be accomplished automatically according to pre-determined criteria  176 , or an operator can manually initiate spool transfer at any time  178 . Block  179  indicates the manual procedure wherein an operator activates the controller, for example through a key pad, to notify the controller to direct a spool transfer. In automatic mode (block  180 ), the controller has been pre-programmed to sense and respond to a pre-determined amount of fiber wound on a spool, and automatically direct the transfer of winding on one spool to winding on another spool. Preferably the pre-determined quantity is a prescribed length of fiber, determined by the controller from the speed and dimensions of the capstan  20 . The controller can alternatively determine the amount of fiber by other methods that will be understood by those skilled in the art, and these are also included in the spirit of the present invention. For example, sensors can be installed to detect the level of fiber on a spool, and the signal provided by the sensors can indicate to the controller that a spool transfer is to be activated. These sensors, for example can include a light emitter and detector. 
     The system  11  then checks to assure that an empty spool is in the transfer position (block  182 ). In alternative embodiment, if an empty spool is not in position  184 , the controller  45  directs the system  11  to stop winding fiber  186 , and give notice that a transfer spool is required (block  186 ). With an empty spool in position  188 , the controller  45  directs the system  11  to spin the empty spool through a speed matching the speed of the fiber being wound (block  190 ). The construction of sensors, etc. required to determine fiber speed and speed of spool rotation will be understood by those skilled in the art, and therefore need not be described in the present disclosure in order to reproduce the present invention. The distributor/positioning apparatus  32  ( FIG.1 ) is then directed by the controller to limit horizontal motion of the sheaves feeding the fiber being wound on a spool, to extremities between the flanges of the shortest spool of the two spools involved (block  192 ). The controller then directs the positioning apparatus  32  so as to move the vertical gantry to position the sheaves feeding the fiber, to a position placing the fiber adjacent to the base of the empty spool (block  194 ). 
     The controller  45  then directs the tape and cutter apparatus to move to the empty spool location (block  196 ). This operation involves rotating of the apparatus  140  ( FIG.4 ) around the pivot point  154 , rotation of the tape and cutter to the correct orientation by the rotational apparatus  150 , and moving the tape and cutter apparatus towards the spool base by the thruster  148 . The distributor horizontal gantry then passes the fiber under the tape roller (block  198 ), and coincident with the positioning of the fiber, the thruster  148  presses the roller against the fiber, a tape section is dispensed by the tape apparatus and the attached wire cuts/breaks the fiber (block  200 ). The tape at this point secures the fiber being fed by the system  11 , to the base of the empty spool. The tape and cutter is then retracted from the area of the empty spool (block  202 ). The system  11  then proceeds with winding the fiber on the new/“empty” spool (block  204 ). The system  11  then checks to determine if the transfer of fiber is complete (block  206 ). 
     If transfer has not taken place  207  i.e. if the operations as described in reference to blocks  200 – 204  have not occurred and the fiber is still being wound on the full spool, or if the fiber is not connected to either spool, the fiber feed is stopped (block  209 ). If the fiber has successfully been transferred to the empty spool ( 211 ), the controller then stops the rotation of the full spool (block  208 ), and directs the distributor to move the sheaves to the normal winding position approximately equidistant from the two spools (block  210 ). As noted in block  212 , a shroud is moved to cover the spool that is being wound. Similarly, a shroud is retracted from covering the full spool that at this point is not rotating, in order to allow removal of the full spool and replacement with an empty spool (block  214 ). The controller then preferably gives a notice that a spool is ready to be replaced (block  216 ). 
     The operation of checking to determine if a transfer of winding to an empty spool is complete, indicated by block  206  will now be described in more detail. The controller is programmed as described in reference to  FIGS. 2   a – 2   j  to know which of the tape dispensers  42  or  43  has ejected tape or i.e. which of the spool positions referenced by drive shafts  24  or  26  has just had tape applied on an empty spool. The controller, as explained in reference to  FIGS. 2   a – 2   j , also knows when a spool upon which fiber is being wound reaches a “full” condition. The controller also has a separate control facility for each of the two spools. When the controller senses that a spool is “full”, it automatically adjusts the speed of the spool to achieve a pre-determined dancer  22  test offset, for example +31 degrees, and this state (+31) is noted by the controller. If the controller senses that a label/tape has just been applied to a spool, the controller adjusts the spool drive so that the dancer  22  is at an opposite pre-determined test offset, such as −31°. The controller can therefore monitor the dancer position to know if transfer has taken place by first receiving indication of a full spool by noting a dancer position of +31°, and subsequently noting a new/changed dancer position of −31°. A position of +31° (full spool) being maintained indicates that a required transfer has not occurred, and if after a pre-determined time interval the detected dancer position does not change to −31°, the winding operation is stopped, as indicated by block  207 . Also, if the fiber becomes disconnected from both spools, the dancer position will exceed +30° and the system is designed to detect such a position and respond by stopping the fiber feed system. 
     While a particular embodiment of the present invention has been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the spirit of the present invention and its other aspects, and therefore the appended claims accomplished within the scope also has changes and modifications as follow within the true spirit and scope of the present invention.