Device for detecting the thickness of a paper sheet

In a paper sheet transfer system for transferring a paper sheet such as bank note, in which the paper sheet is transferred round a rotary transfer roll mounted in a frame and by band-like transfer belts provided as a plurality of pairs spaced apart laterally with respect to the direction of transfer of said paper sheet, said paper sheet being sandwiched in its transfer between upper and lower belts in each of said belt pairs,

• a device for detecting the thickness of the paper sheet comprising:
• a sensor supported by said frame;
• a thickness detection roll disposed to face said transfer roll and pivotally movable according to changes of the thickness of paper sheet being transferred between the detection roll and said transfer roll;
• a detection roll supporting lever rotatably supporting said detection roll, said lever having a sensing surface provided near and facing said sensor and defining therewith a variable gap;
• a lever mounting unit carrying said lever pivotally mounted therein including a plate-like bracket adapted to abut against a frame wall and having a hole formed therein;
• urging means mounted in said lever mounting unit and urging said lever toward said transfer roll;
• positioning means for positioning said lever mounting unit in a predetermined mounting position with respect to frame including a pin projecting from said frame wall for passage through said hole;
• and
• fixing means provided on said frame such as to releasably lock said lever mounting unit in said predetermined mounting position.

In a paper sheet transfer system for transferring a paper sheet such as bank note, in which the paper sheet is transferred round a rotary transfer roll mounted in a frame and by band-like transfer belts provided as a plurality of pairs spaced apart laterally with respect to the direction of transfer of said paper sheet, said paper sheet being sandwiched in its transfer between upper and lower belts in each of said belt pairs,

• a device for detecting the thickness of the paper sheet comprising:
• a sensor supported by said frame;
• a thickness detection roll disposed to face said transfer roll and pivotally movable according to changes of the thickness of paper sheet being transferred between the detection roll and said transfer roll;
• a detection roll supporting lever rotatably supporting said detection roll, said lever having a sensing surface provided near and facing said sensor and defining therewith a variable gap;
• a lever mounting unit carrying said lever pivotally mounted therein including a plate-like bracket adapted to abut against a wall of said frame in a predetermined mounting position and having notches formed therein at opposite side edges thereof;
• urging means mounted in said lever mounting unit and urging said lever toward said transfer roll;
• positioning means for positioning said lever mounting unit in a predetermined mounting position with respect to frame including engaging members secured to said frame wall at positions corresponding to said notches formed in said bracket, each said engaging member having a projection of a shape for snugly fitting in one said notch;
• and
• fixing means provided on said frame such as to releasably lock said lever mounting unit in said predetermined mounting position.