Sheet feeder and image forming apparatus

Abstract

A sheet feeder includes a spool and a pair of roll holders. The spool is configured to hold a roll of print medium having an adhesive surface with no release liner attached thereto, with the roll fitted around the spool. The pair of roll holders is configured to hold the spool at opposed ends of the spool, each including at least a first rotary member, a second rotary member, and a third rotary member that contact an outer circumferential surface of the spool at different locations along the outer circumferential surface of the spool to rotatably hold the spool.

What is claimed is: 
     
         1 . A sheet feeder comprising:
 a spool configured to hold a roll of print medium having an adhesive surface with no release liner attached thereto, with the roll fitted around the spool; and   a pair of roll holders configured to hold the spool at opposed ends of the spool, each including at least a first rotary member, a second rotary member, and a third rotary member that contact an outer circumferential surface of the spool at different locations along the outer circumferential surface of the spool to rotatably hold the spool.   
     
     
         2 . The sheet feeder according to  claim 1 , wherein the first and second rotary members are fixedly disposed on one side of the spool on which the print medium is unwound from the roll, with the unwound print medium located between the first and second rotary members, and the third rotary member is displaceably disposed on another side of the spool opposite to a position at which the print medium is unwound from the roll. 
     
     
         3 . The sheet feeder according to  claim 2 , further comprising:
 a biasing device configured to press the third rotary member against the spool.   
     
     
         4 . The sheet feeder according to  claim 1 , wherein each of the roll holders includes an openably closable member configured to open and close relative to the roll holder, and one of the first and second rotary members is provided to the openably closable member. 
     
     
         5 . An image forming apparatus comprising:
 a sheet feeder including
 a spool configured to hold a roll of print medium having an adhesive surface with no release liner attached thereto, with the roll fitted around the spool, and 
 a pair of roll holders configured to hold the spool at opposed ends of the spool, each including at least a first rotary member, a second rotary member, and a third rotary member that contact an outer circumferential surface of the spool at different locations along the outer circumferential surface of the spool to rotatably hold the spool; and 
   an image forming device configured to form an image on the print medium fed from the roll by the sheet feeder.   
     
     
         6 . The image forming apparatus according to  claim 5 , wherein the first and second rotary members are fixedly disposed on one side of the spool on which the print medium is unwound from the roll, with the unwound print medium located between the first and second rotary members, and the third rotary member is displaceably disposed on another side of the spool opposite to a position at which the print medium is unwound from the roll. 
     
     
         7 . The image forming apparatus according to  claim 6 , further comprising:
 a biasing device configured to press the third rotary member against the spool.   
     
     
         8 . The image forming apparatus according to  claim 5 , wherein each of the roll holders includes an openably closable member configured to open and close relative to the roll holder, and one of the first and second rotary members is provided to the openably closable member.