Bag-making and packaging machine

Abstract

When replacing film rolls, a film holding mechanism fixedly holds a film of a pre-replacement film roll. At the same time, a film suction mechanism holds a film by suction. A film storing mechanism pulls the end of the film up to the film suction mechanism. Furthermore, the end of the film that is held by the film suction mechanism by suction and the head of the film of the post-replacement film roll are joined using an adhesive tape. Also, once it is detected based on the output from the load cell that the film has been entirely unrolled, the control device stops the operations of an items supply portion and motor. Accordingly, the items that have been supplied to a bag-manufacturing and packaging portion from the items supply portion at the time the items supply portion is stopped are packaged using film stored in a film storing mechanism. Then, the control device stops the operation of the bag-manufacturing and packaging portion.

1 . A bag-manufacturing and packaging apparatus that packages items while manufacturing bags from a film roll in which an elongated film is wound in a roll shape, said bag-manufacturing and packaging apparatus comprising: 
 a film roll support portion that supports the film roll;    a film conveyance mechanism that conveys film sent from the film roll; and    a film joining device that is disposed between said film roll support portion and said film conveyance mechanism, said film joining device being for, at the time of replacement of the film roll, joining an end of a film conveyance mechanism side film and a head of the film of a post-replacement film roll; 
 said film joining device having a film storing mechanism for pulling in the film that is disposed on an upstream side relative to a film joining position.  
   
     
     
         2 . The bag-manufacturing and packaging apparatus as set forth in  claim 1 , wherein 
 said film storing mechanism includes 
 a fixed roller that guides the conveyed film,  
 a movable roller that changes a running distance of the conveyed film, and  
 a moving mechanism that moves said movable roller toward and away from said fixed roller.  
   
     
     
         3 . The bag-manufacturing and packaging apparatus as set forth in  claim 2 , wherein 
 said film storing mechanism has a plurality of pairs of said fixed and movable rollers that are disposed alternately.    
     
     
         4 . The bag-manufacturing and packaging apparatus as set forth in  claim 2 , wherein 
 said moving mechanism includes 
 a fixed frame for supporting both ends of said fixed roller,  
 a movable frame for supporting both ends of said movable roller, and  
 a rotational axis supported in parallel with said fixed roller for supporting an end of said movable roller such that said movable roller is rotatable about said fixed frame, and  
   said movable roller moves relative to said fixed roller by allowing said movable frame to rotate about said rotational axis relative to said fixed frame.    
     
     
         5 . The bag-manufacturing and packaging apparatus as set forth in  claim 1 , wherein 
 said film joining device further includes a film suction retaining mechanism that is disposed on an upstream side from said film storing mechanism in a film conveyance direction, said film suction retaining mechanism retaining by suction the film that is severed from a pre-replacement film roll at a time of film joining.    
     
     
         6 . The bag-manufacturing and packaging apparatus as set forth in  claim 1 , wherein 
 said film joining device further includes a film fixedly holding mechanism disposed on a downstream side from said film storing mechanism in the film conveyance direction, said film fixedly holding mechanism being for fixedly holding the film conveyance mechanism side film at the time of joining the films.    
     
     
         7 . A bag-manufacturing and packaging apparatus that packages items while manufacturing bags from a film roll in which an elongated film is wound in a roll shape, said bag-manufacturing and packaging apparatus comprising: 
 a bag-manufacturing and packaging portion for manufacturing bags while packaging items;    an items supply portion for supplying the items to said bag-manufacturing and packaging portion;    a film roll support portion for supporting the film roll;    a driving device for sending out the film from the film roll that is supported by said film roll support portion;    a film conveyer mechanism for conveying the film that is sent out from the film roll to said bag-manufacturing and packaging portion;    a film storing mechanism for sending out film while storing the film that is to be conveyed by said film conveyance mechanism;    a detecting device for detecting that the film of the film roll is exhausted; and    a control portion for stopping operations of said items supply portion and said driving device in response to an output from said detecting device, and for stopping an operation of said bag-manufacturing and packaging portion after the film stored in said film storing mechanism is sent out by an amount that corresponds to a predetermined numbers of bags.    
     
     
         8 . The bag-manufacturing and packaging apparatus as set forth in  claim 7 , wherein 
 said detecting device includes a tension detecting device that detects a tensile force of the film, and    said control portion stops the operations of said items supply portion and said driving device when the output from said tension detecting device exceeds a predetermined value.    
     
     
         9 . The bag-manufacturing and packaging apparatus as set forth in  claim 8 , wherein 
 said control portion controls said driving device such that the tensile force of the film is constant when the output from said tension detecting device is below the predetermined value.    
     
     
         10 . The bag-manufacturing and packaging apparatus as set forth in  claim 7 , wherein 
 said film storing mechanism includes 
 a fixed roller for guiding the conveyed film,  
 a movable roller for changing a running distance of the conveyed film, and  
 a moving mechanism that moves said movable roller toward and away from said fixed roller.  
   
     
     
         11 . The bag-manufacturing and packaging apparatus as set forth in  claim 7 , further comprising 
 a film joining device disposed between said film roll support portion and said film conveyance mechanism, said film joining device joining, at the time of replacing the film roll, an end of the film on the film conveyance mechanisms side and a head of a post-replacement film roll,    said film storing mechanism being disposed on a downstream side from a film joining position of said film joining device.    
     
     
         12 . The bag-manufacturing and packaging apparatus as set forth in  claim 11 , wherein 
 said film storing mechanism includes 
 a fixed roller for guiding the conveyed film,  
 a movable roller for changing a running distance of the conveyed film, and  
 a moving mechanism that moves said movable roller close to and away from said fixed roller.  
   
     
     
         13 . The bag-manufacturing and packaging apparatus as set forth in  claim 12 , wherein 
 said moving mechanism includes 
 a fixed frame for supporting both ends of said fixed roller,  
 a movable frame for supporting both ends of said movable roller, and  
 a rotational axis supported in parallel with said. fixed roller for supporting an end of said movable roller such that said movable roller is rotatable about said fixed frame, and  
   said movable roller moves relative to said fixed roller by allowing said movable frame to rotate about said rotational axis relative to said fixed frame.    
     
     
         14 . The bag-manufacturing and packaging apparatus as set forth in  claim 12 , wherein 
 said film joining device further includes a film suction retaining mechanism that is disposed on an upstream side from said film storing mechanism in the film conveyance direction, said film suction retaining mechanism retaining by suction the film that is severed from the pre-replacement film roll at a time of film joining.    
     
     
         15 . The bag-manufacturing and packaging apparatus as set forth in  claim 14 , wherein 
 said control portion activates said film suction retaining mechanism during the film joining.    
     
     
         16 . The bag-manufacturing and packaging apparatus as set forth in  claim 11 , wherein 
 said film joining device further includes a film fixedly holding mechanism disposed on an upstream side from said film storing mechanism in the film conveyance direction, said film fixedly holding mechanism being for fixedly holding a film-conveyance-mechanism-side film at the time of joining the films.    
     
     
         17 . The bag-manufacturing and packaging apparatus as set forth in  claim 16 , wherein 
 said control portion activates said film fixedly holding mechanism in response to an output from said detecting device.