De-skew mechanism

Abstract

A de-skew mechanism includes a driving shaft installed on a frame of an image forming device and driven by a motor, an active roller installed on the driving shaft and driven by the driving shaft, and an idle roller driven by the active roller for driving a medium with the active roller. A nip is formed between the active roller and the idle roller. The de-skew mechanism further includes a correcting member installed on the driving shaft in a rotatable manner and located upstream of the nip for correcting skew of the medium in a correcting position, and a restoring member connected to the correcting member for loading torque to the correcting member so as to drive the connecting member from the correcting position to a releasing position where the medium pass therethrough.

1 . A de-skew mechanism comprising:
 a driving shaft installed on a frame of an image forming device and driven by a motor;   an active roller installed on the driving shaft and driven by the driving shaft;   an idle roller driven by the active roller for driving a medium with the active roller, a nip being formed between the active roller and the idle roller;   a correcting member installed on the driving shaft in a rotatable manner and located upstream of the nip for correcting skew of the medium in a correcting position; and   a restoring member connected to the correcting member for loading torque to the correcting member so as to drive the connecting member from the correcting position to a releasing position where the medium pass therethrough.   
     
     
         2 . The de-skew mechanism of  claim 1  wherein the correcting member comprises a connecting portion connected to the restoring member, and a correcting portion for blocking the medium so as to correct the skew of the medium. 
     
     
         3 . The de-skew mechanism of  claim 2  wherein the correcting portion is a protrusion. 
     
     
         4 . The de-skew mechanism of  claim 2  wherein a surface of the correcting portion for blocking the medium is a plane. 
     
     
         5 . The de-skew mechanism of  claim 1  further comprising a stopping member for stopping rotation of the restoring member. 
     
     
         6 . The de-skew mechanism of  claim 5  wherein the stopping member is a blocker protruding from the frame of the image forming device. 
     
     
         7 . The de-skew mechanism of  claim 1  wherein the restoring member is a weight. 
     
     
         8 . The de-skew mechanism of  claim 2  wherein the restoring member is a weight. 
     
     
         9 . The de-skew mechanism of  claim 3  wherein the restoring member is a weight. 
     
     
         10 . The de-skew mechanism of  claim 4  wherein the restoring member is a weight. 
     
     
         11 . The de-skew mechanism of  claim 5  wherein the restoring member is a weight. 
     
     
         12 . The de-skew mechanism of  claim 6  wherein the restoring member is a weight. 
     
     
         13 . The de-skew mechanism of  claim 7  wherein the weight is connected with the connecting portion integrally. 
     
     
         14 . The de-skew mechanism of  claim 8  wherein the weight is connected with the connecting portion integrally. 
     
     
         15 . The de-skew mechanism of  claim 9  wherein the weight is connected with the connecting portion integrally. 
     
     
         16 . The de-skew mechanism of  claim 10  wherein the weight is connected with the connecting portion integrally. 
     
     
         17 . The de-skew mechanism of  claim 11  wherein the weight is connected with the connecting portion integrally. 
     
     
         18 . The de-skew mechanism of  claim 12  wherein the weight is connected with the connecting portion integrally.