| 摘要 |
Sheet feeding apparatus comprises suction cups which initially engages the bottom surface of a bottommost sheet in a stack of sheets, with the suction plane thereof parallel to the sheet. The suction cups are then raised a small distance where the cups are tilted in a direction away from a support ledge without any substantial horizontal movement thereof, and following which the suction cups are lowered to pull the front end of the bottommost sheet past the support ledge with a wiping contact and down upon the top and front portions of a drive roller. Adjustable suction cup position control apparatus is provided including a manually progressively adjustable member for varying the peak elevation reached by the suction cups. A stationary cam is provided against which a pivotable follower portion of a suction cup mounting member rides, to vary the inclination of the mounting member and the suctoin cups carried thereby as the elevation of the suction cups is varied. The common gripping plane of the suction cups are maintained at an angle corresponding to the varying tangent lines extending from the varying points of contact of the sheet as it is pulled down upon the drive roller. Suction to the cups is shut-off when pressure rollers are raised to catch a rigid sheet as it springs upward upon release of suction to the suction cups.
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