| 摘要 |
<p>A device for performing a predetermined type of operation, such as a printing operation, upon a strip (10) of working medium, such as paper, at intervals along the strip comprises guide means for guiding the strip along a working path through the device, by way of an operating (printing) station (6,11), and traction means (12) arranged for engagement with the strip and operable to drive the strip along the working path. The device also includes setting means (19,20,28), disposed at an externally accessible position along the working path, upstream of the operating station, for enabling the leading edge of a strip (10) being fed into the device to be positioned at a predefined start location (28) whilst the traction means are disengaged, whereafter engagement can be brought about between the traction means and the strip. Drive control means (33-35,37,38) coupled with the traction means are operable automatically to cause the strip, after engagement with the traction means has been brought about, to move along the working path to such an extent that a preselected portion of the strip is presented at the operating station. Such a system can simplify alignment of desired parts of the strip with the operating station, for example the alignment of the top of a page as defined by fold lines on the strip. </p> |
