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Perforated vacuum hold down surface

a perforated sheet and vacuum technology, applied in the field of perforated sheet material, can solve the problems of wasting some of the available vacuum and the tendency of perforated sheets to fail under the influence of downward pressure, and achieve the effect of maximizing the effectiveness of the vacuum system

Inactive Publication Date: 2012-10-16
GERBER SCI INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention is about improving the effectiveness of a vacuum system in holding down workpiece materials by controlling the density and arrangement of holes on a large scale. It also describes how to increase the service life of the table by reducing the likelihood of cracking by arranging holes on a small scale in a geometric pattern that reduces the likelihood of cracking. These improvements can be combined in a perforated sheet."

Problems solved by technology

Prior art vacuum systems with uniformly distributed holes waste some of the available vacuum because a substantial fraction of the holes are not covered by the workpiece.
In the prior art vacuum surface sheets, the perforated sheets have tended to fail under the influence of the downward pressure of the cutting tool.

Method used

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Examples

Experimental program
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Embodiment Construction

[0016]The invention can be understood through consideration of the figures.

[0017]FIG. 1 shows in schematic form a vacuum worktable of the type used to process sheet material such as cloth and leather. The table includes a supporting structure such as legs, 10. The table itself comprises a working table surface 24 which is the top surface of a flat sheet of material 20 which is essentially impervious to air. The sheet 20 contains a multiplicity of holes or perforations 22 which pass through the thickness of the sheet and connect the top major surface 24 of the sheet 20 of the sheet with the bottom major surface 26 of the sheet 20. Located beneath the surface sheet 20 is a plenum 30 which is connected to a vacuum system 40. The plenum is efficiently sealed to the bottom surface 26 of the work table surface sheet 20. In operation, the vacuum system reduces the pressure in the plenum 30 to below the ambient or atmospheric pressure. This causes air flow through the holes 22. The air flow...

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Abstract

A vacuum hold down table includes a surface sheet having perforations arranged so as to reduce surface cracking when the surface sheet is subject to forces during use of the table; the perforations may also be arranged to that a greater hold down force is produced in that portion of the table where the workpiece will be located, this may be accompanied by varying the hole diameter and / or hole spacing.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to perforated sheet material used in vacuum hold down systems and to vacuum hold down systems which utilize said perforated sheets. Such vacuum hold down systems are used in the cutting of sheet material such as cloth and leather in connection with production of clothing, upholstery and the like.[0002]In operation, a vacuum hold down system provides for a reduced pressure on the bottom side of a perforated sheet. When a sheet of workpiece material is laid on the topside of the perforated sheet, the vacuum draws the sheet workpiece material down against the table and acts to resist lateral motion of the workpiece across the table, even under the influence of forces resulting from cutting. In the prior art of which I am aware, hold down surfaces for use with fabrics and impermeable sheet material such as leather have included straight rows of relatively uniformly spaced holes wherein the holes have an average diameter of a...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B25B11/00A41H43/02B26D7/02B26D5/00B26D7/01
CPCA41H43/0292B26D7/018Y10T156/1707
Inventor BROWN, ERIC
Owner GERBER SCI INT
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