Abstract:
An apparatus and a method for applying labels ( 100 ) supplied from a roll for the labeling of containers ( 10 ) are disclosed. The containers ( 10 ) are fed to a labeling station ( 12 ). A cutting device ( 1 ) provides the required length ( 103 ) of the labels ( 100 ). The cutting device ( 1 ) can be variably controlled according to the circumference of the container ( 10 ).

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This patent application claims priority of German Patent Application No. DE 10 2008 061 976.0, filed on Dec. 12, 2008, the application is incorporated herein by reference. 
       FIELD OF THE INVENTION 
       [0002]    The present invention relates to an apparatus for applying labels supplied from a roll to containers. 
         [0003]    The invention further relates to a method for applying labels supplied from a roll. 
       BACKGROUND OF THE INVENTION 
       [0004]    For labeling processes at high throughput mostly endless label dispensers are used, which are spooled onto a roll core to form a roll of labels. This type of labeling facilitates rather uninterrupted labeling, as it is also possible to provide several rolls of labels in a storage unit, which are supplied to the labeling machine without interruption, if required. 
         [0005]    A labeling machine is known for example from the German utility model DE 20 2005 002 793 U1, which provides amongst other things a high speed cutting unit for endless label bands, wherein the rolls are used in a labeling machine. The cutting unit comprises a rotating vacuum roll with an also rotating cutting element. In order to achieve as large as possible variation of the cut length, both the vacuum roll and the cutting element are provided with a drive each. With the apparatus of the utility model various lengths of the labels can be provided, which are applied as wrap-around labels to various types of container like cans, PET-bottles, glass bottles, tins, glass jars or buckets. 
         [0006]    The U.S. Pat. No. 3,235,443 also discloses a method and an apparatus for applying labels to containers. The labels are transported by a revolving belt and lie on separate pads. These pads are separated from each other by gaps. A cutting device engages these gaps to separate the labels. In order to use a different label length it is necessary to retrofit the transport belt for the labels, so that labels of a different length can be produced. The length of the labels is determined by the distance between the gaps on the belt. 
         [0007]    The European patent application EP 2 042 437 A1 filed on Sep. 3, 2007, (internal document number ROPE 01 254-EP) discloses a wrap-around labeling apparatus. Here, too, a roll of labels is used and supplied to a corresponding cutting device, which separates the individual labels from the rolled material. However, the apparatus disclosed herein only provides labels of a length to completely wrap around the container to be labeled. Furthermore this document discloses how to design the cutting device taking into consideration the thermal expansion coefficients of the individual components so that also at high throughput of the cutting device there is no shift of the length of the labels and no change in the cutting quality of the cutting device due to thermal expansion. 
       SUMMARY OF THE INVENTION 
       [0008]    It is an object of the invention to provide an apparatus for applying labels supplied from a roll to containers, wherein the labels are designed to allow for an environmentally friendly and resource-efficient application of the labels to the containers. 
         [0009]    This object is achieved by the apparatus for applying labels supplied from a roll for labeling containers comprising:
       at least one container feeding device;   a container table;   a container discharge device; and   at least one labeling station, wherein the labeling station has at least a roll with rolled material for the labels, a label feeding device, a cutting device and a glue unit and the cutting device is controllable according to a circumference of the container in such a way that the labels are separable from the roll with respect to their length in such a way that the length is smaller than the circumference of the container.       
 
         [0014]    It is a further object of the invention to provide a method for applying labels supplied from a roll to containers, which allows for an environmentally friendly and resource-efficient application of the labels. 
         [0015]    The above object is achieved by the method for applying labels supplied from a roll, comprising the steps of:
       removing a rolled material for a label from a roll;   adjusting a cutting device via a control unit for cutting a required length of the label from the rolled material to form a cut label;   applying an adhesive on at least a leading region and on at least a tail region of the label in a glue unit; and   applying the cut label with the adhesive applied on the cut label to a circumference of a container in a labeling station, wherein the length is such that the leading region and the tail region of the label applied to the container are spaced apart from each other.       
 
         [0020]    For this purpose the cutting device has assigned a control unit provided with an input unit. The length of the label can be set via the input unit. Thus it is easy to reduce the length of the label so that the label does no longer form a full wrap-around label for the container. If, for example, a label is applied whose length corresponds to only half the circumference of the container, half the material for the label is saved. This reduces the environmental impact and in view of the high number of labels applied to containers, also a substantial reduction of costs is achieved. 
         [0021]    The input unit can be a touch screen. Therefore it is easy for an operator of the labeling station to adjust the length of the labels to thus achieve the required reduction of environmental impact and costs. The adjustment of the cutting device is done in a simple way with two servo motors. The adjustment entered via the input unit is passed to the cutting device via these servo motors. 
         [0022]    The glue unit is designed in such a way that an adhesive is applied at least on the leading region and at least on the tail region of the label. It is also conceivable that the glue unit applies, at least additionally and partially, adhesive between the leading region and the tail region. After the label has been applied to the container, the leading region and the tail region are spaced apart from each other. The label thus can no longer be considered a wrap-around label. Only by this reduction of the label material a reduction of the environmental impact and of the costs is possible. 
         [0023]    In the method according to the invention for applying labels supplied on a roll to containers first the rolled material for the labels is removed from a roll. Via a control unit the cutting device is adjusted to cut the required length of the label from the rolled material. In the glue unit adhesive is applied at least on a leading region and at least on a tail region of the label. In the labeling station the cut label with adhesive applied is applied to the circumference of the container. The length of the label is such that the leading region and the tail region of the label applied to the container are spaced apart from each other. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0024]    In the following, embodiments will explain the inventive method and the inventive apparatus and their advantages in more detail with reference to the accompanying drawings. 
           [0025]      FIG. 1  shows a schematic top view of a labeling machine. 
           [0026]      FIG. 2  shows a schematic top view of a cutting device of such a labeling machine. 
           [0027]      FIG. 3  shows a container to which is assigned a label with adhesive on the leading region and on the tail region, wherein the label has not been applied to the container yet. 
           [0028]      FIG. 4  shows the label applied to the container, wherein the label is no wrap-around label. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0029]    Identical reference numerals are used for like elements of the invention or elements of like function. For the sake of clarity only those reference numerals are shown in the individual figures, which are required for the description of the respective figure. 
         [0030]      FIG. 1  shows a schematic top view of a labeling machine for the uninterrupted labeling of bottles  10  at high throughput, wherein the bottles  10  are continuously fed in a single TOW. 
         [0031]    The labeling machine comprises a feeding conveyor  24 , an infeed star wheel  25  with an infeed worm  23  before it, a guide curve  22 , a carousel  27  with a plurality of turn tables  26  arranged equidistantly on a common arch, a discharge star wheel  8  and a discharge conveyor  9 . The transport elements mentioned, which move the bottles  10  through the machine, are driven continuously in synchronicity with speed and position. 
         [0032]    In the region between the infeed star wheel  25  and the discharge star wheel  8  a labeling station  12  is provided at the outer circumference of the carousel  27  for applying the labels. The labeling station comprises two receptacles  14  for rolls of labels, which supply the labels in the form of rolled material, with a splicing station  15  in between, a cutting device  1 , a glue unit  18 , and a gripper cylinder for transferring a cut label with adhesive on its, in the direction of transport, leading and tail edge onto a bottle  10  moving by. 
         [0033]    The labeling process of the bottle  10  in detail is as follows: a bottle  10  supplied from the feeding conveyor  24  is, in cooperation with the infeed worm  23  positioned sideward, introduced into the infeed star wheel  25  correctly oriented and is pushed from there onto a turn table  26  of the rotating carousel  27  in a continuous motion with the help of the opposing guide curve  22 . There the bottle  10  is axially clamped on the turn table  26  in such a way that the bottle  10  can rotate with the turn table  26  by a centering bell (not shown) that can be raised and lowered with respect to the turn table. The bottle  10  is transported tangentially to the cylinder  17  of the labeling station  12  by the rotary motion of the carousel  27 . 
         [0034]    Moving sideward in parallel the label band is taken in a controlled manner from one of the label band rolls  14  and supplied to a cutting device  1 . The cut label, which during the cutting step is on the rotating vacuum roll  2  with the printed side facing outwards, is passed to the vacuum operated gripper cylinder  7  after the cutting step, from where it is moved past the glue roll with the backside facing outwards and has strips of adhesive  50  applied on the leading region  101  and on the tail region  102  of the label  100 . This label with the strips of adhesive  50  on the leading region  101  and the tail region  102 , is tangentially fed to the carousel  27 , on which the bottles  10  are located. The strip of adhesive  50  on the leading region  101  of the label  100  is brought into contact with the bottle  10  and the label is spooled off by rotation of the bottle  10  about its axis, wherein the adhesive  50  on the tail region  102  of the label  100  is brought into contact with a further region on the circumference of the bottle  10 , so that the label  100  sticks to the bottle  10  completely. The length of the label  100  is such that the label  100  does not reach around the circumference of the bottle  10 . It is emphasized again that the label  100  does not constitute a wrap-around label. The length  103  of the label is smaller than the circumference of the bottle  10  or of the container to be labeled, respectively. The application of the label  100  described above is done during a continuous motion of the carousel  27 . After passing the labeling station  12  and after termination of the spooling process the labeled bottle  10  reaches the discharge star wheel  8  and is passed to the discharge conveyor  9 . 
         [0035]      FIG. 2  shows a detailed view of the cutting device  1  of the labeling station  12 . The label band, which is taken from the rolled material  14 , is fed to the cutting device in the direction of the arrow  31  tangentially to the vacuum roll  2 . The circumferential velocity of the rotating vacuum roll  2  is equal to the feeding speed of the label band, so that the transport of the label band on the vacuum roll  2  proceeds friction-locked without slip. A control unit  40  is assigned to the cutting device  1 . Via the control unit  40  the timing of the cut can be adjusted, so that the control unit  40  can set and synchronize the circumferential velocities of the cutting element  3  and/or of the vacuum roll  2 , in order to produce the desired length  103  of the label  100 . It is taken into account that the circumferential velocity of the cutting tool  4 , which is rotating in the cutting element  3 , is equal to the circumferential velocity of the vacuum roll and thus equal to the feeding speed of the label band. According to the present invention the circumferential velocities of the cutting element  3  and of the vacuum roll  2  are correlated thus that the length  103  of the label produced with the cutting device  1  is smaller than the circumference of the container to be labeled. Preferentially the length of the label is about half the circumference of the container to be labeled. The cutting device  1  can be adjusted in a particularly easy manner in order to adapt the length of the label  100  to be cut to the various types of containers, and so that a corresponding saving and reduction of the environmental impact can be achieved by reducing the length of the labels  100  for the various containers. For adjusting the cutting device  1  the control unit  40  is connected with an input unit  41 . Via this input unit  41  the operator can set the required label length according to the type of container to be labeled. The input unit  41  preferentially is a touch screen. 
         [0036]      FIG. 3  shows a bottle  10  together with a label  100  that has not yet been applied to the circumferential region of the bottle  10 . The label has a leading region  101  and a tail region  102 . For the attachment of the label  100  to the bottle  10  an adhesive  50  has been applied on the leading region  101  and the tail region  102 . The label  100  has a length  103  which is smaller than the circumference of the container or bottle  10 , respectively, to be labeled. As mentioned above, the length  103  of the label  100  is about half the circumference of the bottle  10 . 
         [0037]      FIG. 4  shows a bottle  10  with the label  100  applied to a circumferential region  110  of the bottle  10 . It is evident that the label  100  is not a wrap-around label. The label  100  only partially reaches round the circumference of the bottle  10 . According to the invention it is possible to apply labels  100  to a large variety of containers and to design the labels in such a way that a reduction of the environmental impact and a reduction of the costs for the labels  100  can be achieved. According to the container to be labeled the cutting device can be adjusted via a control unit so that labels of the desired length are cut which do not reach round the circumference of the container completely. The desired adjustment of the cutting device can be done by corresponding servo motors. Thus no retrofit of the cutting device is necessary in order to produce labels of various lengths and to apply them to the container depending on the container type, wherein the label is no wrap-around label. 
         [0038]    The invention has been described with reference to preferred embodiments. However, it is obvious to a person skilled in the art that alterations and modifications can be made without leaving the scope of the subsequent claims.