Device for drilling holes in a stack of plates
AssigneeSiemens Aktiengesellschaft
InventorGunter Hartmann
Life of this patent
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Abstract
A device for drilling holes into a stack of plates such as a stack of printed circuit boards, characterized by an arrangement to provide a cover tape beneath a pressure member of a clamping arrangement to be held by the clamping arrangement on the surface of the stack during the drilling operation to prevent damage to the uppermost plate of the stack. The arrangement for providing the tape preferably includes a supply reel, a takeup reel and a feed device and the tape is preferably guided on the pressure member of the clamping arrangement by a guidance groove.
Claims17
In a device for drilling holes into a workpiece, said device having a drill spindle accepting a drill bit and clamping means for engaging the workpiece adjacent the location of the hole being drilled and for holding the workpiece during the drilling operation, the improvements comprising means for positioning a cover tape on the surface of the workpiece beneath clamping means and directly beneath the drill bit, said means for positioning enabling the tape to be displaced in a longitudinal direction, and said clamping means pressing the cover tape onto a surface of the workpiece during a drilling operation so that as the drill bit drills through the cover tape and into the workpiece, the tape prevents ejecta from the workpiece.
Dependencies are inferred from the claim text.