Non-Shingling Forms-Feed Tractor
Original Publication Date: 1985-May-01
Included in the Prior Art Database: 2005-Feb-18
In sprocket pin-type feed devices for forms having multilayered copies, it is desirable to drive the last copy at the same speed as the first, in order to prevent shingling of the forms. To that end, the sprocket wheels are arranged in pairs to engage the forms from both sides. In a first embodiment of a tractor (Fig. 1), two conventional sprocket wheels are provided, whose sprockets engage the holes in the continuous forms alternately from the upper and the lower side. A second embodiment of a tractor drive, which is especially adapted for feeding multilayered paper strips or forms, consists of a first sprocket wheel of conventional design cooperating with a second wheel having two rows of sprockets that are axially displaced relative to the sprockets of the first wheel (Fig. 3).