Abstract:
Described is an arrangement for feeding and/or taking away magazines intended to receive individual articles, to and/or from an apparatus for treating and/or handling the articles, wherein the apparatus comprises a first transport element which receives a supply of magazines for feeding articles to be treated, and a second transport element which receives a supply of magazines for carrying away treated articles, with the transport elements being arranged in mutually juxtaposed relationship and movable in a horizontal plane. A third transport element is operatively associated with the first and second transport elements and movable between a first position in which it is towards the first and second transport elements and at least one second position in which it is away from the first and second transport elements. The third transport element has at least one movable carrier for at least one magazine. When the third transport element is in the first position the carrier is movable between a first position associated with the first transport element for receiving a magazine from same or for depositing a magazine at same and a second position associated with the second transport element for receiving a magazine from same or for depositing a magazine at same. When the third transport element is in its second position the carrier can assume a third position for receiving a magazine for articles to be treated and a fourth position for depositing a magazine for treated articles.

Description:
FIELD OF THE INVENTION  
         [0001]    The invention generally concerns an arrangement for feeding and/or taking away magazines intended to receive individual articles, to and/or from an apparatus for treating and/or handling such articles.  
           [0002]    In this specification, the arrangement for feeding and/or taking away the magazines to and/or from the apparatus will be referred to broadly as an arrangement for moving the magazines in relation to the apparatus.  
           [0003]    Similarly, the expression apparatus for processing articles will be used to broadly denote the apparatus for treating and/or handling such articles.  
           [0004]    By way of example, the apparatus for processing such articles, whether involving actually treating the articles or handling same in an operating procedure, can be a machine for printing on, packaging or implementing other operations in relation to CDs and/or other articles. Hereinafter the arrangement according to the invention will be particularly described in relation to a printing machine without however that entailing a limitation in that respect.  
         BACKGROUND OF THE INVENTION  
         [0005]    One form of arrangement for moving magazines intended to receive individual articles, in relation to an apparatus for processing such articles, can comprise a first transport element for receiving a supply of magazines for feeding articles to be processed, and a second transport element for receiving a supply of magazines for carrying away processed articles. The first and second transport elements can be arranged in mutually juxtaposed relationship, being respectively movable in a horizontal plane.  
           [0006]    In this respect reference may be made to EP 0 909 728 A1 describing an apparatus for printing on CDs, which has an arrangement for feeding the articles to be printed upon, to the apparatus, and for carrying away the articles after printing has been applied thereto. Those articles are supplied to the apparatus in the form of a stack constituting a magazine. The magazine essentially comprises a base or tray from which a bar, referred to as a spindle, extends upwardly. The respective articles which are each provided with a central opening can thus be fitted on to the spindle. For the purposes of introducing the articles into the receiving units in the printing machine, they are removed from the stack and thus separated off from each other so as to constitute individual articles. After the printing operation has been completely implemented, they are collected again in a magazine in the form of a stack which is moved out of the apparatus. In general terms the procedure in that case is such that the empty magazines from which the articles to be printed upon had been individually removed are subsequently used again for collecting a stack of articles after printing has been applied thereto.  
           [0007]    The arrangement disclosed in EP 0 909 728 A1 admittedly also has a conveyor belt which serves both to feed the apparatus with the magazines filled with the articles to be printed upon, and also to carry away the magazines filled with the printed articles. The arrangement for feeding and taking away the magazines in that fashion is however rather complicated as it performs some additional functions which in many cases may not be required. In addition, it is not very suitable for subsequent fitment to already existing machines which are in production.  
         SUMMARY OF THE INVENTION  
         [0008]    An object of the present invention is to provide an arrangement for moving magazines intended to receive individual articles, in relation to an apparatus for processing such articles, which can avoid disadvantages of prior arrangements and which involves simple structural means for feeding and removing the magazines for the respective articles to be printed upon and which have been printed upon.  
           [0009]    Another object of the present invention is to provide an arrangement for feeding and/or removing magazines for receiving individual articles, to and from an article-processing apparatus, which is so designed that the number of operating personnel can be reduced while at the same time affording enhanced safety for such operating personnel.  
           [0010]    Yet another object of the present invention is to provide an arrangement for moving magazines for receiving individual articles, to and from an apparatus for processing such articles, which is so designed that the procedure involved in delivering the magazines and removing them is rendered more rational while obviating the need for manual intervention in terms of moving magazines and/or articles in relation to the apparatus.  
           [0011]    Yet a further object of the invention is to provide an arrangement for moving magazines for accommodating individual articles, in relation to an apparatus for processing such articles, which affords greater versatility of operation and adaptability to varying operating conditions.  
           [0012]    In accordance with the principles of the present invention the foregoing and other objects are attained by an arrangement for moving magazines intended to receive individual articles in relation to an apparatus for processing such articles, which apparatus comprises a first transport element operable to receive a supply of magazines for feeding articles to be processed to the apparatus, and a second transport element operable to receive a supply of magazines for carrying away processed articles. The first and second transport elements are arranged in mutually juxtaposed relationship and are respectively movable in a horizontal plane. The arrangement includes a third transport element adapted to be operatively associated with the first and second transport elements and movable between a first position of being towards the first and second transport elements and at least one second position in which it is away from the first and second transport elements. The third transport element has at least one movable carrier for at least one magazine, which carrier, when the third transport element is in the first position, is movable between a first position operatively associated with the first transport element for receiving a magazine from same or for depositing a magazine on same, and a second position operatively associated with the second transport element for receiving a magazine from same or for depositing a magazine on same while when the third transport element is in its second position the carrier assumes a third position for receiving a magazine for articles to be processed and a fourth position for depositing a magazine for processed articles.  
           [0013]    As will be seen in greater detail from a preferred embodiment of the arrangement according to the invention as described hereinafter, the arrangement has the third transport element which is arranged in the direction of transportation movement, in front of the first and second transport elements which are each in the form of turntables movable with a stepwise motion. The turntables serve to feed the magazines to the article-separating station and to carry the magazines away from the collecting station respectively, and thus are operable to perform a certain buffer function. The third transport element bridges over the spacing between the two turntables on the one hand and a conveyor belt for feeding the magazines to the apparatus and for carrying the magazines away therefrom on the other hand. The conveyor belt is generally arranged outside the actual apparatus so that there is no necessity for the operating personnel to manually insert the magazines which are filled with the articles to be processed such as printed upon, into the first transport element, or to manually remove the magazines with the processed articles therein, from the second transport element. As indicated above the first and second transport elements are possibly each in the form of a rotary turntable. Furthermore, the carrier which is mounted pivotably to the third transport element bridges over the spacing between the two turntables so that there is no longer any need for the empty magazine to be transposed manually from the turntable for the articles to be processed, on to the turntable for the processed articles. There is thus no necessity for any operator to implement any handling operations in the region of moving parts of the machinery.  
           [0014]    Further objects, features and advantages of the invention will be apparent from the description hereinafter of a preferred embodiment thereof. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0015]    [0015]FIG. 1 is a perspective view of a printing machine provided with an arrangement for feeding and removing magazines intended to receive individual articles,  
         [0016]    [0016]FIG. 2 is a plan view of the machine shown in FIG. 1, but omitting some parts of the casing assemblies, and  
         [0017]    [0017]FIGS. 3A through 3F each show a part of FIG. 2 on a larger scale, with the co-operating components assuming different positions in dependence on the successive illustrated working steps. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0018]    Referring firstly to FIGS. 1 and 2, shown therein is an embodiment of an apparatus according to the invention, in the form by way of example of a printing machine for printing on articles in the form of compact disks (CDs). As can be seen from FIG. 2, that printing machine is provided with by way of example six screen printing stations A-F and further treatment stations as required, for example drying stations, stations for removing static from the CDs and so forth and an entry station G and a removal station I. It further has a transport element in the form of an annular disk  10  which rotates with a stepwise movement and which is provided with receiving means or mountings  12  for articles  14  which are to be processed in the machine. The articles which are disposed in the receiving means  12  are transported from one processing station to another in the machine by the stepwise rotational movement of the annular disk  10 , in the direction indicated by the arrow  16  in FIG. 2.  
         [0019]    The articles to be processed are fed to the apparatus in the form of the printing machine, in magazines which are indicated generally at  18 . The magazines  18  in usual manner essentially comprise a base which is indicated at  20  for example in FIG. 1 and which has an edge  22  at its top side, and a bar or spindle  24  which is mounted centrally in the base  20  and which, when CDs are fitted thereon, extends through the central openings of the CDs in the magazine in superposed relationship. Magazines of that kind and the stacked arrangement of the CDs  14  therein are generally known and will therefore not be described in full detail herein.  
         [0020]    As can be seen in particular in FIGS. 1 and 2, the CDs to be dealt with in the printing machine are placed on a conveyor belt  26  in the form of respective stacks held by the above-described magazines. The conveyor belt  26  circulates in the direction indicated by the arrow  28  in FIG. 2, preferably with a stepwise movement. Operatively associated with the conveyor belt  26  is a reciprocatable linear conveyor  30  which is provided with a carriage  54  and which is operable to bridge over the spacing between the conveyor belt  26  and first and second transport elements in the form of rotatable turntables  32  and  34  respectively which rotate stepwise in the direction of the arrows  35  and  36  respectively. Each of the turntables  32 ,  34  is provided with eight holders  38  for a respective magazine. The turntable  32  receives exclusively magazines  18  which contain articles to be printed upon, while the turntable  34  is intended exclusively for accommodating magazines with articles which have already been printed upon.  
         [0021]    Reference numeral  40  in FIG. 2 denotes a transfer device operable to bridge over the spacing between the two turntables  32  and  34  on the one hand and the transport means formed by the annular disk  10  with the mountings or receiving means  12  for the individual articles  14  on the other hand. The transfer device  40  is provided with a transfer element  44  which can be raised and lowered and which rotates about a vertical axis with a stepwise movement in the direction of the arrow  42  in FIG. 2. Mounted to the underside of the transfer element  44  distributed at uniform spacings over the periphery thereof are six vacuum holders which are diagrammatically indicated at  46  in FIG. 2 and which are of a usual design configuration in this context and which each have three short pipe portions which can be connected to a vacuum source.  
         [0022]    Each magazine  18  which is fed by the linear conveyor  30  to a change-over station indicated at  32 C of the turntable  32  in a manner to be described hereinafter passes into the article-separating station  32 A after six switching stepwise movements in the direction indicated by the arrow  35 . The separating station  32 A is provided with known support means (not shown) which can be moved up and down and which engage under the stack of CDs in the magazine and lift it stepwise in such a way that the CD which is respectively uppermost in the stack is disposed at a specific height at which it can be engaged by the respective vacuum holder  46  of the transfer element  44 , which is above the stack in the separating station  32 A, when the transfer element  44  is moved downwardly. In the course of the following upward movement of the transfer element  40  the respective uppermost CD in the stack in the magazine disposed in the separating station  32 A is lifted off and, in the course of two successive motion steps of the transfer element  44  each of 60°, transported into a position above the receiving means or mounting  12  of the disk  10 , which is respectively in the entry station G. Thereafter the transfer element  44  is lowered so that the CD held by the vacuum holder  46  of the transfer element  44  passes into that receiving means  12 . After the reduced pressure at that vacuum holder is shut off, the transfer element is lifted, with the CD remaining in the receiving means  12  of the receiving station G. The transfer element  44  is moved further on, in the raised condition, by a transport stepping movement, that is to say through 60°. At the same time the rotating disk  10  of the printing machine can be further advanced in the direction of the arrow  16  by a transport step which corresponds to double the spacing of two immediately adjacent receiving means  12  so that now the receiving means  12  which was next but one in opposite relationship to the transport direction  16  and which had been previously emptied passes into the entry station G.  
         [0023]    After the magazine  18  in the separating station  32 A has been emptied by successive transfer of all CDs into receiving means  12  of the disk  10 , then, possibly after further manipulation operations have been implemented, which however are not relevant to full understanding of the present invention, the turntable  32  is rotated through a stepping motion of 45° in the direction indicated by the arrow  35 , so that the magazine which is now empty is moved out of the separating station  32 A and the filled magazine which follows in opposite relationship to the direction of rotation indicated by the arrow  35  passes into the separating station  32 A. In that stepwise movement of the turntable  32 , the emptied magazine firstly passes into an intermediate station and from same, by virtue of the next stepping movement, into the change station  32 C in which the empty magazine is lifted off the turntable  32  and put into an empty holder of the turntable  34 , that holder being respectively disposed in the change station  34 C. After six transport stepping movements of the turntable  32  each of 45° in the direction of the arrow  36 , that empty magazine passes into the collecting station  34 A which is connected by way of the transfer device  40  to the removal station I of the printing machine in which the CDs in the finished processed condition, after having passed twice through the transport path defined by the disk  10 , are removed from the respective receiving means  12 .  
         [0024]    The magazine which is now respectively disposed in the collecting station  34 A is oriented relative to the station  1  in which the printed CDs were removed from the respective holder therein and in relation to the transfer element  44 , in such a way that that vacuum holder  46  of the rotating transfer element  44 , which prior to the last transport stepping movement in the direction of the arrow  42  had deposited a CD to be printed in the receiving station G into a holder disposed therein, comes in to contact in the course of the downward movement of the transfer element  40 , with that CD which is in the respective receiving means  12  in the removal station I, and lifts that CD out of the holder there, when the reduced pressure is switched on, in the course of the subsequent upward movement of the transfer element.  
         [0025]    In the following transport stepping movement of the transfer element  44  in the direction of the arrow  42  the printed CD is transported out of the removal station I and, in the subsequent transport stepping movement, moved into a position above the magazine in the collecting station  34 A. After the transfer element  44  has been lowered again, the printed CD is delivered to that magazine, by a procedure whereby the vacuum is shut down and thereupon the CD drops down and in so doing slides over the spindle  24  of the magazine until finally it comes to rest on the base  20  of the magazine, an intermediate portion carrying the stack, or a CD which is already disposed thereon.  
         [0026]    When the magazine disposed in the collecting station  34 A is filled, the turntable  34  is caused to rotate further in the direction of the arrow  36  by a stepping movement through  450  so that the empty magazine of the turntable, which follows in opposite relationship to the direction of rotation  36 , passes into the collecting position  34 A. With the stepping movement of the turntable  34  which then follows, the magazine passes into the change station  34 C in which it is then removed from the turntable  34  by the linear conveyor  30  in a manner to be described herein, to be transported to the conveyor belt  26 .  
         [0027]    After a CD has been deposited in the respective magazine in the collecting station  34 A, the transfer element  44  is lifted again, whereupon the vacuum holder which at that moment in time is disposed in the collecting station  34 A, in the course of the following stepping movement in the direction of the arrow  42 , again passes into the separating station  32 A associated with the turntable  32 , in order for a CD to again be received in the manner already described hereinbefore from the magazine which is respectively disposed in that station, and in the course of the two following transport stepping movements, to be transported into a position above the receiving means  12  which is then in the entry station G, in order to be deposited therein.  
         [0028]    The linear conveyor  30  which is arranged at a higher level than the two turntables  32 ,  34  and the conveyor belt  26 , besides the above-mentioned reciprocatable carriage  54  which is provided with a spindle nut (not referenced), has a stationary spindle indicated at  56  in FIGS. 3A, 3C and  3 D, which is driven by an electric motor  58  mounted to a guide  59  for the carriage  54 . The path of movement of the carriage  54  and thus the spindle  56  extend in symmetrical relationship with the two turntables  32 ,  34 , the transfer device  40  and the annular transport disk  10 , as can be seen particularly clearly from FIG. 2.  
         [0029]    Mounted to the end of the carriage  54 , which is towards the transfer device  40 , is an arm indicated by reference  60  for example in FIG. 3A. The arm  60  is mounted pivotably in a horizontal plane and is driven by an electric motor  62 . For that purpose, the output shaft of the motor  62  which is carried by the carriage  54  is provided with a pinion driving an endless chain or an endless toothed belt  64  engaging with a gear or pulley  66  fixedly connected to a shaft  68 , to the one end of which the pivotal arm  60  is mounted.  
         [0030]    A piston-cylinder unit indicated at  70  in FIG. 1 is fixed to the pivot arm  60  in the proximity of the free end thereof. It will be seen that the piston-cylinder unit  70  extends downwardly from the arm  60  in FIG. 1. Mounted at the free end of the piston rod of the piston-cylinder unit  70  is a gripper shown at  72  in FIG. 1, which can be moved up and down by suitable actuation of the piston-cylinder unit  70 .  
         [0031]    The carriage  54  is slidable between the first limit position in which it is towards the two turntables  32  and  34 , as shown in FIGS. 3A, 3C,  3 D and  3 F, and a second limit position which is shown in FIG. 3B and also FIG. 3E.  
         [0032]    The pivotal arm  60  is of such dimensions and arrangement that the gripper  72  of the piston-cylinder unit  70 , at the free end of the arm  60 , can be positioned, in dependence on the angular position of the pivotal arm  60  relative to the carriage  54 , when the carriage  54  is in the first position, above the change station  32 C operatively associated with the turntable  32 , as shown in FIGS. 3C and 3F, or above a magazine present in that station or above the change station  34 C operatively associated with the turntable  34  or above a magazine present in one of those stations, more specifically in such a way that the gripper  72  extends in substantially coaxial relationship with the spindle  24  of the respective magazine.  
         [0033]    After the carriage  54  and the pivotal arm  60  have assumed the position shown in FIG. 3A and there is in the change station  34 C a magazine which had been previously filled in the collecting station  34 A, the gripper  72  can be moved downwardly by suitable actuation of the piston-cylinder unit  70 , in such a way that the upper end region of the spindle  24  of that magazine is within the gripper  72 . After the gripper has been closed and has gripped the spindle  24  the gripper is lifted by suitable actuation of the piston-cylinder unit  70 , whereby the magazine is entrained and is lifted out of its holder in the turntable  34 , to such an extent that it comes out of engagement with the turntable and does not collide with any other parts of the machine in the following transportation movements. Then, by means of suitable actuation of the electric motor  58 , the carriage  54  is displaced in the direction of the arrow  72  into its second limit position in which it is towards the conveyor belt  26 . Preferably simultaneously with that movement of the carriage  54  the pivotal arm  60  is pivoted by suitable actuation of the electric motor  62  out of the position relative to the carriage  54  shown in FIG. 3A, into the position shown in FIG. 3B in which the gripper  70  is disposed above the conveyor belt  26 . Thus, upon downward movement of the gripper  72  by suitable actuation of the piston-cylinder unit  70 , the magazine  18  is put down on to the conveyor belt  26  in the deposit station  26 B. In the pivotal movement between the position shown in FIG. 3A and the position shown in FIG. 3B, which is about 90°, the pivotal arm  60 , in relation to the carriage  54  carrying it, experiences a pivotal movement of about 90°. In that movement, the pivotal arm  60  remains on the same side of the plane of symmetry defined by the path of movement of the carriage  54 .  
         [0034]    After the gripper  72  has released the magazine it is moved upwardly. The carriage  54  is moved possibly at the same time into the first position, in the direction indicated by the arrow  76 . During that movement the pivotal arm  60  can be pivoted through 90° relative to the carriage  54  so that, at the end of the linear movement, it again approximately assumes the position shown in FIG. 3A. That is followed by further pivotal movement of the pivotal arm  60  through about 90° into the position shown in FIG. 3C, in the course of which the pivotal arm  60  moves to the other side of the above-mentioned plane of symmetry on which the turntable  32  is positioned. The specific way in which the pivotal movement of the pivotal arm  60  takes place from the position shown in FIG. 3B into the position shown in FIG. 3C depends inter alia also on how high the pivotal arm  60  is arranged above the holder  59  for the carriage  54 . In the illustrated embodiment, as can be clearly seen from FIG. 1, the movement of the pivotal arm  60  from one side of the plane of symmetry on to the respective other side would be possible only when the carriage  54  is in or adjacent to the first limit position as shown in FIGS. 3A, 3C,  3 D and  3 F.  
         [0035]    In the position shown in FIGS.  3 C, the gripper  72  carried by the pivotal arm  60  is aligned coaxially with respect to the respective holder  38  in the change station  32 C, or the respective magazine in the holder. The open gripper  72  is moved downwardly so that the upper end of the spindle  24  passes into the region of the gripper  72 , whereupon the gripper is closed and in closing grips the upper end of the spindle  24 . Thereafter the gripper is lifted so that the magazine comes out of engagement with the respective holder  38  in the change station  32 C. The pivotal arm  60  is then pivoted out of the position shown in FIG. 3C into that shown in FIG. 3D, which corresponds to the position shown in FIG. 3A. The gripper is moved downwardly in order to fit the empty magazine which it is holding into the holder  34  which is respectively disposed in the change station  34 C. Thereafter the gripper is opened and moved upwardly, whereupon the pivotal arm  60  is pivoted into the position shown in FIG. 3C, in the empty condition, that is to say without a magazine.  
         [0036]    The carriage  54  is then moved into the position shown in FIG. 3E. During that movement the pivotal arm  60  performs a further pivotal movement through about  900  in a direction towards the conveyor belt  26 , in such a way that, when the carriage  54  is in the second position shown in FIG. 3E, the gripper  70  is in a position above a magazine with CDs to which printing is to be applied, the magazine standing on the conveyor belt  26  in the receiving station  26 A associated therewith. The receiving station  26 A is substantially defined by a pair of abutments which are indicated at reference  80  in for example FIG. 2 and FIGS. 3A through 3D. The abutments  80  project above the conveyor belt  26  into the path of movement of magazines  18  carried thereon, and defines the position of the magazine  18  with CDs to be printed upon, which is the respective first magazine in the direction of transportation movement on the conveyor belt  26 . The abutments  80  can be arranged stationarily as they define the end of the transportation path defined by the conveyor belt  26  for the magazines  18  with the CDs to be printed upon.  
         [0037]    The magazine which is disposed in the receiving station  26 A is gripped in the manner already described above at the upper end of its spindle  24  and lifted off the belt  26 . Thereupon, the carriage  54  is moved in the direction of the arrow  76  into the first position, while possibly at the same time the pivotal arm  60  pivots through about 90° with respect to the carriage  54  in such a way that, when the carriage  54  assumes the first position, the pivotal arm  60  with the gripper  72  and the magazine  18  hanging therefrom, is positioned as shown in FIG. 3F above the respective holder  38  which is disposed in the change station  32 C and into which the magazine  18  is deposited in the manner already described hereinbefore.  
         [0038]    Since, as also already described, in the preceding step as shown in FIG. 3D an empty magazine  18  had been fitted into the holder in the change station  34 C and then the gripper  72  opened and moved upwardly out of engagement with the spindle  24  of the magazine  18 , the turntable  34  is moved by a further step in the direction of the arrow  36  as soon as the magazine which is disposed at that moment in time in the collecting station  34 A had been filled with printed CDs, so that, at the end of that stepping movement, the magazine which follows in opposite relationship to the direction of rotation  36 , as indicated at  18   a  in FIG. 3D, passes into the change station  34 C, and the empty magazine which had been previously fitted into the holder of the change station  34 C assumes the position of the magazine indicated at  18   b  in FIG. 3D, which follows in the direction of rotation  36 . In that way the pivotal arm  60  which, in accordance with the above-described sequence of operating movements, had just deposited a magazine with articles to be printed upon, in the respective holder disposed in the change station  32 C, can be pivoted from the position shown in FIG. 3F through about 90° in an empty condition into the position shown in FIG. 3A in order to lift the following magazine out of the holder which is now in the change station  34 C and to transport it in the manner described hereinbefore with reference to FIGS. 3A and 3B into the deposit station  26 B which is associated with the conveyor belt  26 . The following working cycle is commenced with those steps. The empty magazines which are disposed in the holders between the change station  34 C and the collecting station  34 A in the direction of rotation indicated by the arrow  36  represent a buffer in order to ensure that there are always sufficient empty magazines available to accommodate the printed CDs in the collecting station  34 A.  
         [0039]    The turntable  32  can be moved along by a stepping movement in the direction indicated by the arrow  35  as soon as the empty magazine  18  has been lifted out of the last station  32 C and moved by the pivotal movement of the pivotal arm  60  into the position shown in FIG. 3D, out of the region of movement of the magazines on the turntable  32 . The magazines which are filled with unprinted CDs and which are disposed between the change station  32 C and the separating station  32 A in the direction of movement indicated by the arrow  35  serve as a buffer in order to ensure that there is always a filled magazine in the separating station  32 A.  
         [0040]    The portion of the conveyor belt  26  for the magazines with the articles to be printed upon can be provided with further pairs of abutments as indicated by references  82  and  84  as indicated in FIG. 2, which are respectively reciprocatable between an operative position in which they project into the path of movement of the magazines  18  for the articles to be printed upon in the printing machine, and an inoperative position. The abutments  82 ,  84  essentially serve to ensure that the respective magazine in the receiving station  26 A is at a spacing from the following magazines and is thus freely movable after it has been gripped by the gripper  72 .  
         [0041]    It will be noted at this juncture that the drive arrangement for opening and closing the gripper  72  is not specifically illustrated in the drawing but it will be appreciated that there are many different forms of drive means which are suitable for the present purpose and which can be fitted to attain the required aim of actuation.  
         [0042]    The conveyor belt  26  can circulate continuously or discontinuously. As there are always determinable periods of time between the removal of magazines from the conveyor belt  26  and the operation of putting magazines on to the conveyor belt  26 , with those periods of time being determined by the through-put capacity of the printing machine, it will generally be appropriate for the conveyor belt  26  to be caused to run discontinuously. When the conveyor belt  26  runs continuously it could be desirable to also provide in the placement station  26 B a releasable abutment which, when a magazine is placed on the conveyor belt  26 , prevents it from being entrained by the conveyor belt  26 , with the abutment being removed only when the operation of placing a magazine on the conveyor belt has been concluded and the magazine has been released from the gripper  72 .  
         [0043]    Instead of the one conveyor belt  26  which extends through the apparatus, for conveying all magazines, it would also be possible to provide two conveyor belts which are arranged in successive alignment and of which a first conveyor belt as considered in the transportation direction indicated by the arrow  28  receives the magazines for the articles to be printed upon and extends approximately as far as the linear conveyor  30 , while the second conveyor belt begins approximately at the linear conveyor  30  and receives the magazines filled with the printed articles and transports them away.  
         [0044]    Even when the printing machine has a high through-put capacity, the period of time required for separating and collecting the CDs of a magazine is so great that the above-described movements of the co-operating conveyor and transport means can be carried out without that entailing a detrimental effect on the through-put capacity of the overall piece of equipment.  
         [0045]    Although the embodiment described hereinbefore and illustrated in the drawing serves for printing on CDs, it will be appreciated that use of the invention is not limited to articles of that nature. In addition the invention can be applied not only to printing machines as described hereinbefore as a preferred embodiment, but in general terms also to those machines in which articles have to be supplied to a piece of equipment for treatment and/or handling thereof and have to be carried away again after that processing operation has been carried out.  
         [0046]    It will be appreciated that the above-described embodiment of the invention has been set forth solely by way of example and illustration of the principles thereof and that various other modifications and alterations may be made therein without thereby departing from the spirit and scope of the invention.