| 摘要 |
<p>A pin tractor assembly for feeding a medium having feed perforations such that the perforations engage drive pins (47) provided on an outer surface of a rotating endless belt (46, 246) which engages a pair of wheels (44) rotatably supported between two spaced-apart frames (32, 33, 232, 233). The two spaced-apart frames (32, 33) are connected to each other by a connecting portion (35, 235), into an integral tractor body (31, 231) having a slot portion (34) which accommodates the pair of wheels (44, 244) and the endless belt (46). The assembly has a device (22, 33, 222, 223) for inhibiting radial movements of the pair of wheels (44, 244) positioned in the slot portion (34, 234) of the tractor body (31, 231).</p> |
