Film feeding roller for air cushion maker

Abstract

A film-feeding roller is applicable to an air cushion maker and facilitates alignment of a plastic film roll on roll supporters of the air cushion maker, so as to ensure a plastic film to be continuously and straight released from the film roll to be made into an air cushion.

1 . A film-feeding roller applicable to an air cushion maker, comprising:
 a core tube;   a pair of film retaining plates provided at two ends of the core tube, wherein each said film retaining plate and the corresponding end of the core tube is rotationally retained while the film retaining plate is shiftable along the core tube;   a pair of caps fixedly assembled to the two ends of the core tube for positioning the film retaining plates; and   a pair of compression springs, each compression spring settled between one said cap and one said film retaining plate.   
     
     
         2 . The film-feeding roller as claimed in  claim 1 , wherein, each said end of the core tube is formed with a slit that is axially extending on a periphery of the core tube for a predetermined length while each said film retaining plate is formed with an inset portion so that when the film retaining plate is assembled to the core tube, the inset portion is fittingly received in the slit. 
     
     
         3 . The film-feeding roller as claimed in  claim 1 , wherein, each of the caps has an inner ring and an outer ring for pressingly receiving the corresponding end of the core tube therebetween. 
     
     
         4 . The film-feeding roller as claimed in  claim 3 , wherein, the outer ring has a round outer periphery and a smooth surface wile a retaining flange is formed along the outer periphery. 
     
     
         5 . The film-feeding roller as claimed in  claim 4 , wherein, when the film-feeding roller is mounted on the roll supporters, the two caps lie on two roll supporters of the air cushion where the film-feeding roller is applied to while the retaining flanges laterally abut against the supporters.