Tractor and printer equipped with the same

Abstract

According to one embodiment, a tractor comprises a pin belt, a pair of rotating units and a roller. The pin belt configured as an endless belt, which has a plurality of pins on the outer peripheral surface thereof, wherein the pins are respectively inserted into feeding holes formed on a tractor paper, and the pin belt rotates to convey the tractor paper. The pair of rotating units configured to rotate the pin belt. The roller, which is arranged between the pair of rotating units, with a groove on the outer peripheral surface thereof, wherein the front end of the pin is fitted into the groove, so that the front end of the pin is abutted against the groove to space between the outer peripheral surface of the pin belt and the outer peripheral surface of the roller.

1 . A tractor, comprising:
 a pin belt configured as an endless belt, which has a plurality of pins on the outer peripheral surface thereof, wherein the pins are respectively inserted into feeding holes formed on a tractor paper, and the pin belt rotates to convey the tractor paper;   a pair of rotating units configured to rotate the pin belt; and   a roller, which is arranged between the pair of rotating units, with a groove on the outer peripheral surface thereof, wherein the front ends of the pins are fitted into the groove, so that the front ends of the pins are abutted against the groove to space between the outer peripheral surface of the belt and the outer peripheral surface of the roller.   
     
     
         2 . The tractor according to  claim 1 , wherein
 the depth of the groove of the roller is set to be smaller than the height of the pin so as to space between the outer peripheral surface of the pin belt and the outer peripheral surface of the roller.   
     
     
         3 . The tractor according to  claim 1 , wherein
 the roller enables the front end of the pin fitted into the groove to be abutted against the groove, thereby curving the rotation track of the pin belt.   
     
     
         4 . The tractor according to  claim 1 , wherein
 the rotation track of the pin belt is linearly arranged between the pair of rotating units.   
     
     
         5 . The tractor according to  claims 2 , wherein
 the depth of the groove of the roller is set to be d, the height of the pin is set to be h, the thickness of the tractor paper is set to be d 1 , and a given number is set to be n; the outer peripheral surface of the pin belt and the outer peripheral surface of the roller are spaced by satisfying the following condition: d≦h−n*d 1 .   
     
     
         6 . The tractor according to  claims 1 , further comprising:
 a chamfer part, which is formed on the opposite sides of the outer peripheral surface of the roller along the rotational center line of the roller.   
     
     
         7 . The tractor according to  claims 1 , wherein
 the cross-section of the groove is formed with curved concavity shaped.   
     
     
         8 . The tractor according to  claim 2 , wherein
 the roller enables the front end of the pin fitted into the groove to be abutted against the groove, thereby curving the rotation track of the pin belt.   
     
     
         9 . The tractor according to  claim 2 , wherein
 the rotation track of the pin belt is linearly arranged between the pair of rotating units.   
     
     
         10 . The tractor according to  claims 3 , wherein
 the depth of the groove of the roller is set to be d, the height of the pin is set to be h, the thickness of the tractor paper is set to be d 1 , and a given number is set to be n; the outer peripheral surface of the pin belt and the outer peripheral surface of the roller are spaced by satisfying the following condition: d≦h−n*d 1 .   
     
     
         11 . The tractor according to  claims 4 , wherein
 the depth of the groove of the roller is set to be d, the height of the pin is set to be h, the thickness of the tractor paper is set to be d 1 , and a given number is set to be n; the outer peripheral surface of the pin belt and the outer peripheral surface of the roller are spaced by satisfying the following condition: d≦h−n*d 1 .   
     
     
         12 . A printer, comprising:
 a tractor claimed in the  claims 1 ; and   a printer unit configured to print on the tractor paper conveyed by the tractor.