| 摘要 |
An apparatus for the printing industry relating to the folding of printed webs. More particularly the invention concerns the means for uniformly gripping the full width of a wide printed web at intermittent periods to obtain accurate folding. The gripping apparatus is opened and closed by an endwise shifting of an actuator. A cam at one end causes the actuating member to shift one way and then a cam at the other end shifts the actuating member in the other direction. The actuator member is itself cammed to move fore and aft as it moves endwise and imparts only its fore and aft movement to a movable gripper jaw. There is no arcuate swinging of a rod such as in previous devices and hence there are no adverse effects of torque or twisting occuring during the gripping operation. The present construction permits uniform gripping of the full width of the printed web without any tendency of the operator member to twist and irregularly grip the web.
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