Binding device

Abstract

A binding device includes a thermal head, a transport portion, a heater, a bonding portion, and a control portion. The thermal head heats an ink of an ink ribbon and transfers the ink to a tape. The transport portion transports the tape to which the ink has been transferred. The heater heats an adhesive that coats the tape. The bonding portion bonds the tape to an edge portion of a sheet stack including a plurality of sheets by bringing the adhesive with which the tape is coated, and which has been heated by the heater, into contact with the edge portion of the sheet stack. The control portion controls the heating temperatures of the thermal head and the heater such that the heating temperature that is applied to the ink by the thermal head is higher than the heating temperature that is applied to the adhesive by the heater.

What is claimed is: 
     
         1 . A binding device, comprising:
 a thermal head that heats an ink of an ink ribbon and transfers the ink to a tape;   a transport portion that transports the tape to which the ink has been transferred;   a heater that heats an adhesive that coats the tape that is transported by the transport portion;   a bonding portion that bonds the tape to an edge portion of a sheet stack that includes a plurality of sheets by bringing the adhesive with which the tape is coated, and which has been heated by the heater, into contact with the edge portion of the sheet stack; and   a control portion that controls the heating temperatures of the thermal head and the heater such that the heating temperature that is applied to the ink by the thermal head is higher than the heating temperature that is applied to the adhesive by the heater.   
     
     
         2 . The binding device according to  claim 1 , wherein
 the heater is provided with   a first heater that heats a part of the tape that comes into contact with an edge face of the sheet stack, and   a second heater that heats a part of the tape that comes into contact with at least one of a front face and a rear face of the sheet stack, and   the control portion controls the heating temperature of the heater such that the heating temperature that is applied to the adhesive by the first heater is higher than the heating temperature that is applied to the adhesive by the second heater.   
     
     
         3 . The binding device according to  claim 1 , further comprising:
 a cutting portion that cuts the tape and is disposed on an upstream side of the transport portion in the direction in which the tape is transported.   
     
     
         4 . The binding device according to  claim 2 , further comprising:
 a cutting portion that cuts the tape and is disposed on an upstream side of the transport portion in the direction in which the tape is transported.   
     
     
         5 . The binding device according to  claim 2 , wherein
 the width of the part of the first heater that comes into contact with the tape is less than the width of the tape.   
     
     
         6 . The binding device according to  claim 5 , wherein
 the second heater comes into contact with a part of the tape that protrudes beyond an edge of the first heater.   
     
     
         7 . The binding device according to  claim 1 , wherein
 the bonding portion is provided with a plurality of sheet stoppers that clamp the sheet stack from the front face side and the rear face side.   
     
     
         8 . The binding device according to  claim 1 , wherein
 the bonding portion is provided with a support portion that supports the second heater.   
     
     
         9 . The binding device according to  claim 1 , wherein
 the ink is a hot-melt pigment ink.   
     
     
         10 . The binding device according to  claim 1 , wherein
 the ink is a dye sublimation ink.   
     
     
         11 . The binding device according to  claim 1 , wherein
 the ink ribbon is coated with the ink having melting temperature that is higher than the heating temperature by the heater.   
     
     
         12 . The binding device according to  claim 1 , wherein
 the tape is coated with the adhesive that penetrates between individual sheets of the plurality of sheets that are in the stacked state under a temperature that is lower than melting temperature of the ink.   
     
     
         13 . A binding device that bind sheet stack by affixing a thermoplastic adhesive that coats on one side of a tape to one edge of the sheet stack, the binding device comprising:
 a printing portion that prints an image on a tape, the printing portion including a platen roller that guides the tape, a thermal head that heats an ink ribbon, and a ribbon transferring device that transfers the ink ribbon passing between the platen roller and the thermal head;   a bonding portion that bonds the tape to one edge of the sheet stack, the bonding portion including a sheet holder that clamps the sheet stack, a pressing part that presses the sheet stack against the tape, and a heater that heats the tape;   a transport portion that transports the tape through the printing portion to the ponding portion; and   a control portion that controls the heater such that the temperature of the thermoplastic adhesive on the tape is higher than a second temperature and is not exceed a first temperature, the first temperature being a melting temperature of an ink that coats on the ink ribbon, and the second temperature being a melting temperature of the thermoplastic adhesive on the tape and being lower than the first temperature.   
     
     
         14 . A non-transitory computer-readable medium storing computer readable instructions that cause a binding device to perform:
 controlling heating temperatures of a thermal head and a heater such that the heating temperature that is applied by the thermal head to an ink of an ink ribbon to transfer the ink to a tape is higher than the heating temperature that is applied by the heater to an adhesive that coats the tape to which the ink has been transferred; and   bonding the tape to an edge portion of a sheet stack that includes a plurality of sheets by bringing the adhesive with which the tape is coated, and which has been heated by the heater, into contact with the edge portion of the sheet stack.   
     
     
         15 . The non-transitory computer-readable medium according to  claim 14 , wherein the controlling comprises controlling the heating temperature that is applied by a first heater included in the heater to the adhesive on a part of the tape that comes into contact with an edge face of the sheet stack is higher than the heating temperature that is applied by a second heater included in the heater to the adhesive on a part of the tape that comes into contact with at least one of a front face and a rear face of the sheet stack.