Abstract:
Creased paper board packages are unstacked, separated and conveyed. Discs are loaded into dimensionally controlled trays using relatively fine alignment, placement and assembly tolerances. Subsequently, the disc-loaded trays are assembled onto less dimensionally controlled tray-holding panels on creases paper boards using relatively less stringent tolerances. Booklets are inserted in pockets in panels adjacent the disc-holding panels, and the paper board packages are closed.

Description:
[0001]    This application claims the benefit of U.S. Provisional Application No. 60/296,759, filed Jun. 11, 2001. 
     
    
     
       BACKGROUND OF THE INVENTION  
         [0002]    Prior art disc packaging machines place the trays on the cover panels and then the discs on the pre-attached trays. This necessitates precise alignment of cover panels and precise positioning of trays on panels so that the discs may be automatically pushed onto rosettes. Misalignments of discs and rosettes by more than 0.006 of an inch stop the machines. The result requires long and expert set up time for proper automatic disc placement and creates a significant amount of down time, resulting in economic loss.  
           [0003]    Needs exist for improved disc packaging.  
         SUMMARY OF THE INVENTION  
         [0004]    In the present invention, a CD or DVD package is assembled by assembling discs on trays in one line and concurrently in a second line unstacking cover panels followed by applying glue on the panels. The trays which carry the disks are then placed on the glued panels. The panels with the pre-loaded trays are inspected and then closed.  
           [0005]    The panels may have multiple sections, and the disc-loaded trays may be placed in the desired sections under the control of electronic controls. For example, the panels may have from two to four sections, and the disks may be placed on any of sections one, two, three or four.  
           [0006]    Two or more disks and trays may be placed on different sections of the same panel.  
           [0007]    The advantage of loading the discs in the trays and then loading the trays onto the pre-glued panels is the broadened dimensional tolerance for placement of the loaded trays on the glued panels. The broadened tolerances translate into reduced set up time by less skilled workers and reduced machine shut downs. One worker may operate several machines, resulting in improved economics in disc packaging.  
           [0008]    Qualifications for placement of discs on trays are exaggerated by having a tray already fixed on a cover panel. The new invention provides off line loading of discs on trays.  
           [0009]    {fraction (1/16)}-inch deviations of placement on trays are visually acceptable. The placement of a tray can be in one of four positions on the panel board. The placement of a loaded tray on a panel board has a relatively large tolerance of +/−{fraction (1/16)}-inch max (+/−0.062 inches). The small tolerances of 0.006 inches for placing a disc on a pre-placed tray require twice the set up time and produces four times the down time. When a disc will not go onto a rosette, a machine stops.  
           [0010]    A tray is dimensionally accurate to +/−0.002 inches. A board may vary in size by about 0.014 inches and may change in size according to ambient moisture conditions. When a tray is placed on a board, the tray placement may be off by 0.006 inches or more. Excessive set up time for precise control and down time by machine stoppage is caused by putting trays onto panels first. More operators and more machines are required for multiple use formats. By putting discs on trays first, a singe operator may tend more machines. Each machine may be quickly changed for multiple tray formats.  
           [0011]    The outer graphic sheets may be plastic or paper board. Paper board may change tolerances. Costs of the boards are reduced by not requiring precise size tolerances. Packages may contain two or more trays, which may contain 4, 8, or 12 discs being packaged in a panel, spine, panel, spine, panel sandwich manner.  
           [0012]    These and further and other objects and features of the invention are apparent in the disclosure, which includes the above and ongoing written specification, with the claims and the drawings. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0013]    [0013]FIG. 1 is a diagram showing the disc placement zones.  
         [0014]    [0014]FIG. 2 is a diagram showing the disc package assembly for one disc.  
         [0015]    [0015]FIG. 3 is a diagram showing the disc package assembly for two discs. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0016]    [0016]FIG. 1 shows the disc-loaded tray  21  placement zones. The package can be a two-panel package  23 , three-panel package  25 , or four-panel package  27 . The disc-loaded tray  21  placement may occur in zone A, B, C or D. Booklet insertion in pockets  29  may occur in zone B, C, or D. The closed product exits in lane A or B.  
         [0017]    [0017]FIG. 2 shows the disc package assembly for packaging single discs into packages. Boards  31  are drawn from the bottom of a stack and are shingled or feathered on board infeed  1 . On the main line  33 , the boards  31  are stripped from the bottom of the shingled array on infeed  1  at board stripper station  2 . At glue station  3 , glue is deposited on an appropriate panel which receives a tray which has been loaded concurrently on a lateral line  35 . Trays  37  are stacked in the tray buffer  4  and are moved inward to the disc buffer  5 . The disc buffer aligns discs for loading. The discs  39  are loaded into the trays at the disc placement station  6 . The packaging cover panel sheet material has been loaded at the board infeed with buffer  1 . The board strip station  2  has taken one board  31  from the stack of boards. The glue station  3  has prepared the board to receive the disc-loaded tray  21 . The disc-loaded tray  21  is brought in from the disc placement station  6  and is glued onto the packaging at the disc-loaded tray placement station  7 . The package is inspected at the inspection station  8 , and the package is then folded and closed at the closing stations  9 . The closing stations  9  have seven different closing operations depending on which type of packaging is used, two-panel, three-panel, or four-panel. The folded and closed packages exit on exit conveyor  10 .  
         [0018]    [0018]FIG. 3 shows the disc package assembly for packages containing two discs. The board infeed with buffer  1  unloads the boards, and the board strip station  2  separates and prepares one board from a stack of boards for gluing and for the arrival of the disc-loaded trays  21 . The glue station  3  has dual heads, which prepare the board  31  for receiving two disc-loaded trays at the tray with disc placement stations  7 . Tray placement station  7  is separated into two stations  7 A and  7 C for placing disc-loaded trays on panels A and C of a four-panel package board  27  such as shown in FIG. 1.  
         [0019]    Lateral line  35  is divided into two lanes with conveyors  35 A and  35 C, which respectively serve stations  7 A and  7 C. The tray buffer  4  loads trays  37  onto both of the tray conveyors  35 A and  35 C. The disc buffer  5  has two loading mechanisms  6  and loads one disc  39  into each tray at the disc placement stations  6 A and  6 C. The discs in the trays then go to the tray placement stations  7 A and  7 C having two points of arrival.  
         [0020]    In multiple disc packages, the tray buffer releases a second tray, which is loaded onto the lane C or D tray conveyor  35 . A second disc is placed in the tray at the disc placement station  6 C or  6 D. This disc-loaded tray is glued onto the board in the C or D position at the tray with disc placement station  7 C or  7 D.  
         [0021]    Alternatively, several discs may be mounted on a single multiple layer tray at station  6  and the single loaded tray may be mounted on the cover sheet at station  7 . The sizes of the spines are increased to accommodate the thicker multiple disc trays.  
         [0022]    The booklet infeed conveyors  41  allow booklets to be placed in a pocket  29  in the A, B, or C position on the board, as shown in FIG. 1. The booklet is placed in the package at the booklet insertion station  12 . The package is then inspected at the inspection station  8  and sent to the closing stations  9  consisting of five separate closing mechanisms depending on how the package is composed. Settings are changed in the electronic control panels  11  to adjust for the number of panels in each package and the desired positions of the loaded trays and the booklets in each package.  
         [0023]    The tray loading occurs at the disc loading station  6 . The plastic trays and plastic discs can be assembled easily, using the precise dimension control and reference of the plastic surfaces, readily meeting the tolerances of 0.006 inches for alignment of the disc openings with the tray rosettes.  
         [0024]    When the loaded trays are positioned over the package boards for assembly, a two and one half times greater tolerance of 0.016 inches is permitted for mounting the loaded trays on the paper boards, having varied reference surfaces. The result is less machine stopping for out of tolerance products.  
         [0025]    The invention is a process for assembling a CD or DVD package. Formed printed sheet material is constructed with multiple panels. Trays holding compact discs are attached to the sheet material, and the package is closed.  
         [0026]    The formed multi panel sheet material infeed into the machine uses adhesive, which is applied to the multi panel sheet. Discs are placed into trays mechanically or to adhesive on formed multi panel sheet forming disc-tray assemblies. Disc-tray assemblies are placed onto the sheet material. Printed information cards or booklets are combined with the packages. The packages leave the machine open or closed.  
         [0027]    Combing the disc into the tray before the tray is placed onto the board decreases the complexity of an assembly machine and lowers cost, set up time, size of the machine and its complexity.  
         [0028]    While the invention has been described with reference to specific embodiments, modifications and variations of the invention may be constructed without departing from the scope of the invention, which is defined in the following claims.