Sheet manufacturing apparatus

Abstract

A sheet manufacturing apparatus includes a defibrator that generates a defibrated material, a accumulating portion that forms a web by accumulating the defibrated material, and a sheet shaping portion that includes a first roller and a second roller, and forms a strip-shaped sheet by pressing the web. The sheet shaping portion includes a first roller retention unit at which the first roller is installed, a drive motor, a gear to which rotation of the drive motor is transmitted so as to rotate the second roller, a first transmission gear to which rotation of the gear is transmitted, a one-way clutch gear installed at the same rotating shaft as the first transmission gear, a gear to which rotation of the one-way clutch gear is transmitted, a cam installed coaxially with the gear, and a pin that is fixed to the first roller retention unit and performs positioning of the first roller retention unit by coming into contact with the cam. The first transmission gear includes an idling mechanism capable of running idle over a certain period.

What is claimed is: 
     
         1 . A sheet manufacturing apparatus comprising:
 a defibrator that defibrates a material containing a fiber and generates a defibrated material;   a accumulating portion that forms a web by accumulating the defibrated material; and   a sheet shaping portion that includes a first roller and a second roller, and forms a sheet by pressing the web, wherein   the sheet shaping portion includes
 a first roller retention unit at which the first roller is installed, 
 a drive motor that is configured to be rotated in a forward direction and a reverse direction, 
 a second roller gear that receives transmission of rotation of the drive motor and rotates the second roller, 
 a first transmission gear that receives transmission of rotation of the second roller gear, 
 a one-way clutch gear installed at a rotating shaft common to the first transmission gear, 
 a cam gear that receives transmission of rotation of the one-way clutch gear, 
 a cam installed coaxially with the cam gear, and 
 a pin that is fixed to the first roller retention unit and performs positioning of the first roller retention unit by coming into contact with the cam, and 
   the first transmission gear includes an idling mechanism configured to run idle over a certain period.   
     
     
         2 . The sheet manufacturing apparatus according to  claim 1 , wherein
 the idling mechanism of the first transmission gear includes   a cutout provided to the first transmission gear, and   a contact plate fixed to the rotating shaft in such a way as to correspond to the cutout.   
     
     
         3 . The sheet manufacturing apparatus according to  claim 2 , wherein
 the first transmission gear runs idle with respect to the rotating shaft until an edge portion of the cutout comes into contact with the contact plate, and   the first transmission gear rotates the rotating shaft when the edge portion of the cutout comes into contact with the contact plate.   
     
     
         4 . The sheet manufacturing apparatus according to  claim 1 , wherein
 the one-way clutch gear runs idle when rotation in the reverse direction of the drive motor is transmitted to the rotating shaft through the second roller gear and the rotating shaft is rotated in a second direction, and   the one-way clutch gear is rotated when rotation in the forward direction of the drive motor is transmitted to the rotating shaft and the rotating shaft is rotated in a first direction being opposite to the second direction.   
     
     
         5 . The sheet manufacturing apparatus according to  claim 1 , wherein the cam causes the first roller retention unit to ascend or descend through the pin by being rotated at a predetermined angle. 
     
     
         6 . The sheet manufacturing apparatus according to  claim 5 , wherein
 the first roller retention unit descends to bring the first roller into contact with the second roller, and   the web is pressed by the first roller and the second roller.   
     
     
         7 . The sheet manufacturing apparatus according to  claim 6 , wherein the cam is an eccentric cam. 
     
     
         8 . The sheet manufacturing apparatus according to  claim 7 , wherein the cam is fixed to the cam gear.