Roll holder device

Abstract

A roll holder device is composed of a first holder and a second holder. The first holder is provided with a rotary-claw unit for a forward rotation, which works when the first holder rotates in a forward direction (clockwise direction). The rotary-claw unit includes a rotary claw, a retainer, a compression spring, a stopper and so forth. The rotary claw is rotatable around a shaft attached to the retainer. The compression spring biases the retainer toward the stopper in the clockwise direction. In attaching the first holder to a recording-paper roll, the rotary claw abuts on and rotates along an inner circumference of a core of the recording-paper roll.

1 . A roll holder device for a sheet roll in which a strip of a sheet is wound around a cylindrical core, said roll holder device comprising: 
 a first holder attached to one end of said sheet roll;    a second holder attached to the other end of said sheet roll, said first and second holders holding said sheet roll and integrally rotating therewith;    a fit portion equipped on at least one of said first and second holders, said fit portion being squeezed into said core and fitting to an inner circumference thereof;    at least one rotary member disposed at said fit portion, said rotary member abutting on said inner circumference of said core and rotating in attaching said fit portion to said core; and    a rotary-member biasing mechanism for projecting said rotary member from said fit portion and for biasing said rotary member so as to press the inner circumference of said core.    
     
     
         2 . The roll holder device according to  claim 1 , wherein said core is made of a paper.  
     
     
         3 . The roll holder device according to  claim 2 , wherein each of said first and second holders has said fit portion, and ends of the respective fit portions are connected.  
     
     
         4 . The roll holder device according to  claim 2 , wherein said rotary-member biasing mechanism includes: 
 a rotary-member support shaft for rotatably supporting said rotary member, said rotary-member support shaft extending in a direction perpendicular to an attachment direction of said fit portion;    a retainer for retaining said rotary member via said rotary-member support shaft;    a retainer support shaft attached to said fit portion to rotatably support said retainer, said retainer support shaft extending in parallel to said attachment direction; and    a biasing member for biasing said retainer so as to pivot said retainer around said retainer support shaft.    
     
     
         5 . The roll holder device according to  claim 4 , wherein said rotary-member biasing mechanism further includes: 
 a stopper for regulating a pivot of said retainer biased by said biasing member.    
     
     
         6 . The roll holder device according to  claim 5 , wherein said biasing member is a compression spring.  
     
     
         7 . The roll holder device according to  claim 2 , wherein said rotary member is a disk.  
     
     
         8 . The roll holder device according to  claim 7 , wherein a part of said rotary member projects toward said core via an opening formed in a circumference of said fit portion.  
     
     
         9 . The roll holder device according to  claim 8 , wherein said rotary member is movable between a first projection position where said rotary member most projects from said fit portion, and a second projection position where said rotary member is pushed back against said rotary-member biasing mechanism in association with an attachment operation of said fit portion to press said inner circumference of said core.  
     
     
         10 . The roll holder device according to  claim 9 , wherein when said rotary member is kept in said second projection position, said rotary member tilts relative to a normal line passing a contact point of said inner circumference of said core.  
     
     
         11 . The roll holder device according to  claim 10 , wherein there are first and second types of said rotary members, said rotary member of the first type pressing said inner circumference of said core in a condition that the rotary member tilts in an anterior direction of a time when said first and second holders rotate in a forward direction, and said rotary member of the second type pressing said inner circumference of said core in a condition that the rotary member tilts in an anterior direction of a time when said first and second holders rotate in a backward direction.  
     
     
         12 . The roll holder device according to  claim 2 , wherein said rotary member and said rotary-member biasing mechanism compose a unit, and a plurality of said units are disposed at regular intervals in a circumferential direction of said fit portion.  
     
     
         13 . The roll holder device according to  claim 1 , further comprising: 
 a holder interlocking mechanism for connecting said first and second holders, said holder interlocking mechanism generating an attractive force, by which said holders attract each other, when an interval of said holders is predetermined length or less in attaching said first and second holders to said sheet roll,    wherein a condition of F 1 <F 2  is satisfied when F 1  represents attachment resistance caused by pressing said rotary member against said inner circumference of said core and F 2  represents said attractive force generated by said holder interlocking mechanism.    
     
     
         14 . The roll holder device according to  claim 13 , wherein said first holder has a rod passing therethrough, and said rod projects to the outside of said second holder through a bearing of said second holder when said first and second holders are attached to said sheet roll.  
     
     
         15 . The roll holder device according to  claim 14 , wherein both ends of said rod projecting from said first holder and said second holder are settable to a pair of support members and the following condition is satisfied:  
         LA<LB<LC wherein LA represents an interval of the completely interlocked first and second holders, LB represents an interval of said support members, and LC represents said predetermined length of said first and second holders.    
     
     
         16 . The roll holder device according to  claim 13 , wherein said rotary-member biasing mechanism includes: 
 a rotary-member support shaft for rotatably supporting said rotary member, said rotary-member support shaft extending in a direction perpendicular to an attachment direction of said fit portion;    a retainer for retaining said rotary member via said rotary-member support shaft;    a retainer support shaft attached to said fit portion to rotatably support said retainer, said retainer support shaft extending in parallel to said attachment direction; and    a biasing member for biasing said retainer so as to pivot said retainer around said retainer support shaft.    
     
     
         17 . The roll holder device according to  claim 16 , wherein said biasing member is a compression spring.  
     
     
         18 . The roll holder device according to  claim 13 , wherein said holder interlocking mechanism includes: 
 a first engagement member disposed in one of said first and second holders, said first engagement member being formed in a triangle shape having first and second incline surfaces located at both sides of its central top portion;    a projection disposed in the other of said first and second holders to project in a radial direction of the holder, said projection coming into contact with said first engagement member in connecting said holders;    a biasing member for biasing said first engagement member in said radial direction to sequentially slide said first and second incline surfaces on said projection in connecting said holders, said biasing member generating said attractive force when sliding said second incline surface on said projection; and    a second engagement member for engaging with said first engagement member after sliding said second incline surface on said projection.    
     
     
         19 . The roll holder device according to  claim 18 , wherein said fit portion is equipped on said first holder, said first engagement member and said biasing member are disposed in said second holder, and said projection and said second engagement member are disposed in said fit portion.  
     
     
         20 . The roll holder device according to  claim 19 , wherein said biasing member is a compression spring, and said second engagement member is a hole formed in a circumference of said fit portion.