| 摘要 |
A recorder or printer device including apparatus for threading a continuous web of printable material from a supply through a main drive nip, including a main drive nip formed by a drive surface of a rotatable roll and a main presser which urges the web against the roll, a loop-introducing guide surface arranged relative to the drive surface of the roll, to form a convergent channel leading to the drive nip, and an initial presser for urging the web against the roll at an initial drive nip spaced from the main drive nip. The initial presser has a second position separate from the drive roll for enabling placement of a leader portion of the web between the initial presser and the roll with the leader extending past the initial nip. In its nip position, the initial presser and the loop introducing guide surface are cooperatively constructed and arranged with respect to the roll in the manner that rotation of the roll causes retrograde motion of the leader to form a loop that is progressively guided toward the main nip until the main nip becomes effective to drive the web; and further rotation of the roll is effective to move the free end of the leader portion out from under the initial nip and through the main nip, the main nip thereafter, being effective to feed the web through the machine as a single layer.
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