Document interleaver device
The present invention relates to a device for handling documents and in particular for interleaving or intermixing documents from separate stacks in accordance with a predetermined pattern. The invention also provides counter means for counting and displaying a count of the number of documents selected from the separate stacks and the total number of documents. 
     BACKGROUND OF THE INVENTION 
     Various situations exist where it is desirable to mix or interleave documents and various types of mechanisms capable of interleaving or collating documents are available. These devices tend to be bulky and associated with machines such as document copiers. These devices, however, are not suitable for high reliability applications, such, for example, as where paper currency is to be interleaved, which must be done with precision and an accurate count provided. The problem is particularly severe in situations where new &#34;brick&#34; currency is to be introduced into circulation. Banks and department stores are frequently the focal points of such problems. The banks are required by charter, among many other responsibilities, to place new money into circulation. 
     Bank cashiers and tellers have a particularly difficult time handling new currency, and bank patrons receiving the new currency may have problems as well. Various studies have been made about the problem, and it has been estimated that bank personnel counting new currency may be slowed at least 15 times the normal rate because of the tendency of the new currency to stick together. Not only is the initial counting slow, but repeated counting is necessary to avoid mistakes and loss of money. Frequently, too, the best and most reliable personnel in the bank is assigned to do this kind of work because of the importance of avoiding mistakes. Handling the new money is also a problem in that its sharp edges can result in cuts to the hands and fingers of persons handling it. The resulting increased handling on the part of the teller also causes delays which are a further cause of dissatifaction with bank service. 
     One way of minimizing the complaint of patrons is for a teller or cashier to hand out a combination of new and used money. Frequently, old money is interleaved between the new on a second count. Heretoforth is has been a hand operation which is tedious and time consuming. 
     THE NATURE OF THE INVENTION 
     The present invention provides for the first time a document interleaving device that is capable of interleaving various types of documents, but is particularly useful for interleaving new currency with used currency. There is presently no known device which will reliably do this job. 
     The present invention is directed to a device which is quiet, compact, and is simple to operate and which preferably provides fail-safe operation. Thus, it can be used at a teller&#39;s or cashier&#39;s work station without occupying undue space, producing distracting noise, or complicating the teller&#39;s work. The device operates at high speed, conservatively accomplishing the job 15 times faster than it can be done by hand. It can be made extremely accurate by the inclusion of a single sheet stripper such as is disclosed in the U.S. patent application of George P. McInerny, Ser. No. 869,663, filed Jan. 16, 1978, in each of the document flow paths for each of the stacks of currency employed. 
     In addition to being useful as an interleaver, the device is capable of being used as a straight counter of currency, and, hence, can serve both functions. 
     The present invention also makes it possible with currency and other documents which should be inspected to provide an overlapping output whereby the operator can inspect to see differences in the documents, such as a mistake in the insertion of bill of the wrong denomination or even a piece of paper which is not currency, which has inadvertently, or intentionally, been inserted in the stack. 
     The present invention is also capable of use for non-currency applications, and, in such applications, it may interleave from more than two stacks and in various patterns and sequences according to some predetermined logic. The device will find particular applications where its compactness and quietness are an advantage. It also is not subject to error due to wear and provides easy low cost maintenance. 
     More specifically, in accordance with the present invention, a device for interleaving documents is provided. Included are document bins for receiving stacks of each of the documents to be interleaved. Means defining separate feed paths extend from and direct documents from each of the document bins to a merger point. A merged feed path subsequent to the merger point connects the separate feed paths to a common collection bin. Each of the respective feed paths has at least a single document separation means along its length in defining at least part of the path to assure that no more than one document moves along its feed path at one time. Document sensing means is provided along each document feed path after the document separation means to detect when a document has passed through the single document separation means. Drive means is provided for each separate feed path driving at least the single document separation means. Means is provided to activate the respective drive means in sequence, including logic means responsive to the document sensing means for predetermined sequential activation of the respective drive means so that only one document passes through a selected one of the document paths to the merger point at a time, whereby documents from the respective document bins are interleaved in a predetermined sequence. 
     Counters are preferably provided in each of the separate feed path after the single document separation means, in order to give a count of documents which have passed the single document separation means. Display means related to the counter means may give counts for the number of document separated from each of the document bins and may also give a cumulative total. It is possible as well to have sensing means along the feed paths to detect when the bins are empty. This can be done at various stages by suitable techniques, but preferably is done at a point where the documents are continuously fed through the device by detecting a discontinuity in flow. 
     The structure of the device of the present invention has unique features including a reference deck which is preferably tilted from the vertical plane. A second parallel deck allows double deck bearing support for the rotating members, support for drive structure and various techniques for supporting guide members. In addition, the present invention provides a means for displaying the bills as they are passed through the device so that each of the documents passing through the device may be seen and identified visually. This includes a feed means which spaces the leading edge of successive documents from the previous leading edge. This is particularly important for money handling application to permit visual confirmation of genuine bills of proper denomination. 
    
    
     SPECIFIC DESCRIPTION OF AN EMBODIMENT OF THE PRESENT INVENTION 
     For a better understanding of the present invention, a preferred embodiment is shown in the accompanying drawings in which: 
     FIG. 1 is a side elevational view of a document interleaver device of the present invention; 
     FIG. 2 is a plan view of the document handling portion of the present invention taken along line 2--2 of FIG. 1; 
     FIG. 3 is a partial view showing detail of some of the guide structure seen in FIG. 2; 
     FIG. 4 is a back view of the drive system of the frame of the present invention; 
     FIG. 5 is an enlarged view of the document collection portion of FIG. 2 showing documents being processed; 
     FIG. 6 is an enlarged detailed view showing documents in place viewed along line 6--6 of FIG. 5; 
     FIG. 7 is a back view of a portion of a sheet metal guide member with its support shaft in supporting position; 
     FIG. 8 is a sectional view taken along line 8--8 of FIG. 7; 
     FIG. 9 is a detailed view taken from the back showing the locking feature of the support shaft of FIGS. 7 and 8 viewed along line 9--9; 
     FIG. 10 is a diagrammatic view representing in combination the mechanical flow of paper and the sensing and electronic monitoring thereof leading to counts and control information; and 
     FIG. 11 is a diagrammatic showing of an output or display panel useful with the present invention. 
    
    
     Referring first to FIG. 1, the structure of the device of the present invention is supported on a frame member consisting of two parallel decks. The reference deck 10 is spaced from, but parallel to, secondary deck 12. Spacing columns and other mechanical structure providing interconnection and rigid support between these two decks is omitted from the drawing for the sake of clarity and to avoid confusion with the operating structure. However, it will be understood by those skilled in the art that such connections, which are entirely conventional, are provided. The frame is supported through reference deck 10 within a cabinet 14, the outline of which is shown in phantom. Cabinet 14 contains the power supply and certain circuitry as well as providing a base for support of the device. In a preferred embodiment, the deck 10 is snuggly received within a rectangular opening and a lip of the cabinet which extends inwardly and terminates in a flange parallel to the cabinet face through which the opening extends. This flange provides a positioning stop for reference deck 10. Preferably a reinforced member is added to it or part of the flange to enable the reference deck 10 to be bolted into place on the cabinet. It will be observed that the cabinet face through which the device extends is tilted at an angle to the vertical, which angle, in the embodiment shown, is approximately 15°, and the cabinet supports the device in this position. The slight angle of the reference deck from vertical causes documents placed in the bins and moving through the feed paths to have one edge held in index by gravity against the reference deck 10. This is because the bins are arranged perpendicular to the reference deck. 
     FIG. 2 is a plan view looking squarely into the reference deck 10 from the side on which the document processing structure of the system is located. The device shown is a device which is particularly useful in banks and other locations handling new money and is useful for interleaving new money with old, or individual documents from one stack 16 with those from another stack 18. It will be appreciated that the documents in stack 16 and 18 pass along document feed paths, generally designated A and B, which are functionally identical. Therefore, in describing them, corresponding structure related to the two feed paths will be described together and are given the same number designator with the addition of an &#34;a&#34; or &#34;b&#34; suffix. 
     The bins in which the documents 16 and 18 are loaded consist of a support platform 20a, 20b somewhat downwardly inclined from the horizontal toward reference deck 10 and toward the feed path as well to aid by gravity indexing as well as the movement of the documents into their respective paths. The document stack has its movement limited toward its associated path, however, by wall 22a, 22b, normal to the reference deck and generally normal to the support platform. The bottom of wall 22a, 22b is bent slightly in the direction of movement of the documents and the wall is terminated above the support slide 20a, 20b. Extending through each of the support slides 20a, 20b are a pair of resilient belts 24a, 24b which engage the bottom document on each of the stacks 16 and 18. Each of the belts is driven by a drive shaft 104a, 104b, around which it passes, and passes over path defining pulley 27a, 27b and 26a, 26b, (see FIG. 2) on a common shaft with the friction drum of the sheet separator to be described. The direction of rotation is such as to move the sheet toward the frictional drum 30a, 30b and into a nip between it and a counter-rotating belt 32a, 32b. The counter-rotating belt bears against a freewheeling pulley 34a, 34b which deflects it from its path between its pulleys 36a, 36b and shaft 104a, 104b. The documents are guided by sheet metal guide walls or guards 40a, 40b on one side, and 42a, 42b on the other. Counter rotating belts 32a, 32b extend through operational slots through guides 40a, 40b. Similarly, acceleration friction belts 44a, 44b carried on pulleys 46a, 46b and 48a, 48b are provided slots through guide 42a, 42b. As seen in FIG. 3, spring members 29a, 29b are supported on guide 40a, 40b extend through slots 31a, 31b, respectively, to urge documents into belts in 44a, 44b as they pass over pulleys 46a, 46b. Guide 40a, 40b also supports a pressure plate 45a, 45b which rotatably supports the axle for rollers 49a, 49b which is urged through openings in guide 40a, 40b against the pulleys 48a, 48b to insure adequate feed pressure in this area. The guide 40a, 40b also supplies support for photoelectric pick-ups 50a, 50b and guides 42a, 42b supply support for light source 52a, 52b which normally illuminate the photo pick-ups 50a, 50b. Sheet metal guides themselves are supported from the wall 10 in a manner which will be described in greater detail by similar support posts 54. 
     The document feed paths A and B merge at merge point M at the beginning of a merged feed path, ultimately terminating in a collection bin 56, a right angle formed sheet metal member affixed perpendicularly to the reference deck 10. Intermediate the collection bin is an intermediate examination deck 57 preferably an integral sheet metal part of bin 56 and over which the documents pass in a fanned out arrangement as will be discussed hereafter. The merge point leads into the nip between rollers 58 and belts 60. Belts 60 are each supported between a pair of pulleys 62 and 64 and each roller 58 deflects one of the belts 60 from its straight line path between the pulleys. The same shaft which supports rollers 58 supports one end of beams 66, which rotatably support their other end axle 68 and the support roller 70. Roller 70 is opposed to the conveyor belts 72 adjacent that end where they are supported on pulleys 74. The belts 72 extend between pulleys 74 on one end and pulleys 76 on the other. A sheet metal guardwall 78 extending upward from deck 57 prevents the inadvertent loss of documents. The extension of wall 78 is wall 42 which defines one of the boundaries of the mixed document path and, above that, of path A. 
     The operation of the device may be understood by reference to FIG. 2. First it should be explained when paper money is sorted the stacks 16 and 18 on decks 20a and 20b places the narrow end edge of the bills against reference deck 10. Preferably the bills overhand the edges of decks 20a and 20b and throughout the system extend beyond the guide walls so that they may be manually pulled from the machine if necessary. 
     As will be later explained, when the drive means of the sheet preparation means 30a, 32a of devices along path A is operating, the drive means of the sheet separation device 30b, 32b, of feed path B, is shut down. The bottom bill or document from stack 16 is moved along by conveyor belts 24a into the nip of the sheet separating means 30a, 32a so that only a single bill or document is taken and it is moved through the sheet separating means and guided by guide walls 40a and 42a to the acceleration belt 44a which is running at high speed and will tend to pull the bill or document out of the sheet separation means. 
     When the document reaches the photo-detector 50a, it will block it off from light 52a causing the detector to generate a pulse which may be used as a count of the document moving down path A and also signals the shut down of the drive along path A and the start up of the drive of path B. When the drive of path B is activated, conveyor 24b moves the document into single sheet separation means 30b, 32b, thence, down between guides 40b, 42b past acceleration rolls 44b and photo-detector 50b, causing the document to be counted and the drive along path A reactivated. 
     What happens following the passage beyond the merger point is best seen in FIG. 5 which shows an enlargement of the structure involved and also shows bills passing through the system. As the documents come through the point of merger M they pass between the roll 58 and the belt 60, which serves primarily to position them for the output station. These members provide a direction changing means to change documents from a position having a generally vertical to one having a generally horizontal orientation. As each document drops off of the edge of rolls 64 it is guided to assume a position on top of a stack already formed and moving slowly under the urging of belt 72 into the nip formed with roll 70. In this position, the documents are arranged with successive documents exposed for a distance predetermined by relative speed of parts of the device along its edge, whereby numbers on the notes can be identified and the document can be exposed to clearly identify it for what it is. For example, where paper currency is involved, the numbers showing denomination may be exposed. 
     Reference is now made to FIGS. 1, 4 which show the drive system of the present invention. Thus, in FIG. 1, motor 80 supported on second deck 12 with its shaft supporting pulleys 82 and 84. Pulley 82 is a double belt pulley which drives belts 86 which, in turn, drive pulleys 88a and 88b. As seen in FIG. 1 cooperating clutch 92a and brake 94a are provided on drive shaft 96a, which is reality two aligned shafts selectively connected or disconnected by clutch 92a. Similar clutch and brake structures are provided on each drive shaft. Clutch 92b is seen on shaft 96b in FIG. 5. The clutches and brakes are selected from many known types. Each clutch 92a and 92b functions to permit drive along its selected document path A or B by selectively engaging the clutches of the drive shafts 96a and 96b. Each brake functions to stop such driving when its clutch is disengaged. Such operation is conventional and the structure and operation in detail will be familiar to the man skilled in the machinery arts. 
     Brake winding 94a is supported rigidly on the housing 12 by winding support which includes angular magnetic pole piece 95a which attracts armature 97a which is supported on and connected rigidly to the shaft through spring 99a and a hub assembly 101a. The nature of the spring and hub assembly is better seen in FIG. 4a wherein it will be observed that the spring member 99 is a sort of spiral structure the outer ends of whose spiral arms are attached to the armature. The structure provides little yield in the rotational direction but is designed to permit movement of the supported armature relative to the shaft (or pulley 88a) sufficient for the structures to work. The winding 92a for the clutch and winding 94a for the brake are never energized at the same time. When the clutch is energized to achieve the position shown in FIG. 4, the brake winding is deenergized. When the brake winding is energized, the clutch winding is deenergized so that the pulley 88 remains freewheeling on its bearing on shaft 96a despite the fact that the shaft 96a has been stopped. 
     Drive shaft 96a, 96b preferably passes through its respective clutch and brake at the barrier provided by reference deck 10 and supports drive pulleys 48a, 48b for driving the accellerator conveyor belt 44a, 44b. A smaller pulley 98a, 98b on a coaxial extension of shaft 96a, 96b drives the double belt 100a, 100b which, in turn, drives the big double pulley 102a, 102b on shaft 104a, 104b. This shaft carries friction roll 30a, 30b and provides the center of rotation for pulleys for belts 24a, 24b and counter-rotating belt 32a, 32b (pulley 34). The clutch and brake system is such that, if shaft 96a rotates, 104a will rotate. But because pulleys 106a, 106b are mounted on shaft 104a and through double belt 108a, 108b, pulleys 110a, 110b, shaft 112a, 112b also is also driven in the reverse direction from the roller to drive the counter-rotating belt through pulley 36a, 36b. 
     In similar fashion, the shaft of motor 80 also drives a belt 114 through pulley 84. Belt 114, in turn, drives a larger pulley 116 on shaft 118. Shaft 118, in turn, drives pulleys 64 driving belt 60. Shaft 118 has a friction wheel 120 whose high frictional periphery bears against it and is thereby driven and it, in turn, drives shaft 122 carrying the pulleys 76 driving belts 72. 
     One of the aspects of the present invention which has separate novelty apart from the document away device, but makes the rest of the device particularly convenient to use, is the removable nature of the tray plates, stop plates and guide plates. They can be quickly removed from reference deck 10 and second deck 12 giving free access to the various conveyor belts, pulleys and rollers. One key aspect to this is making the various sheet metal pieces (i.e., 40a, 40b, 42a, 42b) in composite assemblies so that relatively few pieces need to be removed. Another feature is the support structure for these removable pieces which consist of support shafts 54. In accordance with the preferred embodiments of the invention, it is characteristic that the sheet metal structure which is cantilevered from reference deck 10 is supported by these shafts by virtue of their extension not only through support reference deck 10 but also secondary deck 12. 
     Although structure of the support shaft 54 have been omitted from FIG. 1 to avoid confusion with the drive shafts. The nature of the support shafts 54 can be best seen by reference to FIGS. 7, 8 and 9 which illustrate the support of guide 42a. As seen in FIGS. 7 and 8, each support shaft 54 penetrates reference deck 10 and secondary deck 12 to give substantial support to the cantilevered guide 42. As seen in FIG. 2, a screwdriver slot 54a is all that is required to provide the latching feature of the support shaft 54. The shafts are designed to penetrate both decks and receive support from them. Where more than one support shaft is employed to support a given shet metal members, ordinarily it is unnecessary to lock more than one of the shafts in place. As seen in FIGS. 7 and 8, the shafts are supported by bracket means 134 which depend upon mechanical blocks 132, stand off member whose thickness which corresponds to the diameter of shafts 54, spaces the bracket 134 from the sheet metal guide (e.g., 42a) providing support, the non-locking shaft 54 may simply be held in place by bracket members 134. Separate bolt means may also be used to hold a non-rotating shaft in place, since it need not rotate. However, the locking shaft 54, because of its need to rotate, must be held by brackets 134. Preferably, the brackets 134 are provided with slots 134a as seen in FIG. 7 to receive roll pins 136 which extend diametrically through the rotating shaft 54. This shaft is able to be rotated from the position shown in FIG. 7 a quarter of a turn. In modification, rotation may be limited by enclosing the shaft in the bracket, extending the slots in brackets 134 and making them closed at both ends to provide stops for the pins 144. 
     In any event, in the embodiment shown, the rotating shaft is indexed by its roll pins and trapped so that it can rotate but cannot move laterally. 
     Locking of the rotating support post occurs because at the end of the shaft which extends beyond secondary deck 12 there is provided a circumferential groove 138 positioned so that when the shaft is fully inserted, with deck 20a against reference deck 10, the groove 138 lies just behind the plate 112. FIGS. 7 and 9 show the support post in locked position. By reference to FIG. 9, it will be seen that the shoulder provided by the remote sidewall of the groove 138 in the remote end of the shaft is cut away by providing a chord cut 140 tangent to the wall of the groove 138 wall. In the locked position as shown, a member 142, no thicker than the groove and conveniently a washer, is fixed by fastener 144 to the remote side of secondary deck 12 extends far enough over the edge of the bounding wall of the hole which receives support shaft 54 to engage the bottom of groove 138. Thus rotating the post a predetermined angle, here 90°, but up to 180°, counterclockwise from the position shown in FIG. 9, will bring the chord cut 140 tangent to the bottom of the groove and permit retraction of the support post 54 from deck 12 and 10. This is accomplished using the screwdriver slot 54a in the opposite end of the shaft to release the roll pins 136 from their positions against one end of the slots 134a. The reverse procedure is used in putting post 54 in place. In the procedure post 54 is positioned in a position identified by its screwdriver slot position 54a so that it will pass through the openings in both decks 10 and 12 and past the washer 142. The washer 142 will act as an indexing stop against the opposite uncut sidewall of channel 146 when the post is fully inserted. When indexed at that position, the post is again rotated the predetermined angle which is limited by roll pins 136 hitting the ends of slots 134a in brackets 134 using a quarter turn by the screwdriver slot 54a to return post 54 to the locked position shown in the drawings. It should be noted that the construction makes all activity associated with assembly of the sheet metal guides, and similar structure, possible from the front of the device, and outside of the cabinet. 
     It will be appreciated that other posts 54 in the system may be used exactly in the same way and screwdriver slots 54 or their equivalent are provided for the purpose of enabling the locking and unlocking of the post and assembly supported structure to the frame formed by decks 10 and 12 from the front of the mechanism. With but a simple twist of a screwdriver, the posts 54 are locked in place or unlocked so that the sheet metal structure which they support may be removed readily from the decks to afford easy access to the conveyor belts and pulleys. 
     Referring now to FIG. 10, an expanded system embodying the present invention is shown represented schematically by blocks representing some of the essential elements. In the system illustrated instead of simply A and B separate document paths, there are N document paths provided, of which paths A, B, C and N are illustrated. Each of these paths has a feed bin or hopper 160a, 160b, 160c. . . , 160n, which feeds a sheet separation mechanism 162a, 162b, 162c. . . , 162n. Each sheet separator is part of a document flow path 164a, 164b, 164c. . . , 164n which feeds into a merged document flow path 166. This may occur at a point M or there may be several submerger points, providing the same effect cumulatively. Along each of these paths is a transducer 166a, 166b, 166c. . . , 166n which corresponds to the flow detector 52a, 52b. These sensors feed signals to logic 168 which may be programmable or fixed in its pattern and which, for example, may permit such things as modification of the sequence in which the documents are fed, modification of the number of documents that are fed on each occurrence, etc. Logic may also be provided to shut down in response to signals from transducers which may be photodetectors 170a, 170b, 170c. . . , 170n, which detect an absence of documents from the supply. These may be arranged through the logic as shown, or direclty, to trigger some kind of display or audible signal which may identify the particular hopper which needs additional documents. In any event, the logic would cause the equipment to shut down until the hopper is refilled. The logic operates upon feed controls including the motor clutches 94 and brakes 92, here designated feed controls 172. As documents pass through the various channels, the counter means keeps count of each document feed channel and count of each document may be displayed, as well as the total count of all documents, in display 174. The program selection 176 may allow selection of certain hoppers only, may determine the sequence of feed, set the number of documents to be fed from a particular hopper before the next hopper is called upon to supply documents, etc. These may be seen in greater detail in FIG. 12 which represents, however, the program display and program selector for the two channel embodiment shown in the other drawing. 
     A typical display and selection panel is shown for the two channel systems of FIGS. 1 and 5 in FIG. 11 includes a power switch 178, a combination start/reset-stop switch 180, a continue batch switch 182, a mode switch 184 and a batch select switch 186. The display portion 174 includes three related digital displays which will include the display 188 for document path A, the display 190 for document path B and combined total display 192. Additionally, error detect lights 194a and 194b signal error within the A and B document flow paths. 
     Switch 178 applies power to the system and particularly to the logic and counter portion 168. Switch 180 is a momentary switch. When initially depressed it grounds the counters, or otherwise causes them to reset at 0, and, therefore, displays 188, 190 and 192 reset to zero. Following this the logic permits the motor 80 to start. Thereafter, after a controlled delay, the appropriate brake and clutch will energize starting operation of the machine in program sequence. When the machine is running, switch 180 serves as a stop switch and depressing the switch will stop the motor. 
     Switch 184 when placed in the interleaving mode will cause a document from the stack 16 to flow from tray 20a, then documents 18 to flow from tray 20b, and continuing to alternate one bill at a time from each of the stacks when the switch 184 is put in the standard mode position. Only a document from the stack 16 in the tray 20a will be fed when in put from tray 20b is disabled. The batch select switch 186 determines the total number of documents or bills to be fed. These can be selected in finite numbers of 10, 25, 50 or 100 or show what ever other quantities may be specified for a given system. If the select switch 186 is set on the infinity position, it will continue to interleave until the documents in one of the hoppers are exhausted. Otherwise, the numbers selected on the scale setting for the switch 186 will determine the last count accepted by the counter which will also serve to shut down the system and prevent further feed. 
     The displays 188 and 190 give the running count of the number of documents passing the photosensors. These two figures are added to give a total in the display 192, or, alternatively, a separate photodetector may be used to make its own count after the documents are merged. In either event, the logic will cause both feed systems to be disabled before the system shuts down in order to ensure that all bills reach the output stacker. 
     Error detect indicators 194a, 194b are lights or LEDs that will light automatically and stop the machine process when a bill fails to pass the appropriate photosensor depending upon whether the delay or failure to feed occurs in the A or B document feed section. The logic will cause the error detector light to illuminate and at the same time stop the system, which will necessitate removing the bills from the system and starting the count again. 
     A preferred embodiment of the present invention in a form which has been actually built and tested has been described. By showing a system diagram in FIG. 10 which suggests variations of the theme, some of the possibilities for modification of the system have been brought out. Still others will occur to those skilled in the art. 
     One system for fastening sheet metal structures, including guides, in place has been described. Other systems may be used with the present invention and that particular structure described may be used for other purposes other than the interleaving device. 
     The appended claims are intended to set forth the bounds of the present invention. Claims are intended to include all of the structures shown and described. However, the claims apply to many more structures will occur to men skilled in the art. All such structures are intended to be within the scope and spirit of the present invention.