Electric heating – Metal heating – By arc
Patent
1984-03-02
1985-10-01
Albritton, C. L.
Electric heating
Metal heating
By arc
83152, 83276, 83402, 83 98, 219121FS, 219121LY, B23K 2600
Patent
active
045448248
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to equipment for handling sheet or stock material in a pattern cutting machine having a perforated worktable disposed for supporing the material, and means for cutting workpieces from the material.
BACKGROUND ART
Pattern cutting machines have been developed, the operation of which is controlled by programmed numerical control means, wherein a cutting device, e.g. a laser, cuts a desired pattern in the material, e.g. cloth. The time for the cutting operation itself has been greatly reduced in such machines, but it has not been possible to remove cut material and supply new material for cutting in a time satisfactorily short enough for properly being able to utilize the speed in cutting, and minimize the time required for an operational cycle, and this is essential in the machines where only one or a few material layers are cut in a cutting operation.
The inventive equipment is particularly utilizable in cutting cloth material for men's suits, particularly made-to-measure suits, measurements taken by the tailor being worked into the data program controlling the operation of the cutting head of the machine.
The cutting head may comprise, i.a. a deflection mirror deflecting a laser beam towards the material, there being mirrors arranged to lead the beam from a stationary laser unit to the cutting head, independent of its position relative the plane of the table.
One object of the invention is to provide a pattern cutting machine of the kind indicated, in which the material in a flat condition can be rapidly placed on the machine worktable, from which cut material may be rapidly and reliably removed for deposition on a deposition table. A further object is to provide treatment of a material such as woollen material when it is taken into the machine, such that odour caused by laser cutting of the material is reduced.
DISCLOSURE OF INVENTION
The invention relates to equipment for handling sheet material in a pattern cutting machine, including means for cutting workpieces from the material, a perforated worktable adapted for supporting the material web, an inverted hood adapted for extending over the underside of the perforated surface of the table, and fan means connected to said hood and adapted to establish a sub-pressure in said hood for retainging the material web on the table during the cutting operation, wherein a suction hood, having a perforated suction surface facing towards the table and with a size substantially corresponding to that of the table, is adapted for travel between a first position over the table and a second position outside one rear edge of the table, with the suction hood adapted such that it can attract and lift the material to its suction surface in the first position and release said material, in the second position, there being material capturing means arranged at the forward edge of said suction hood for coacting with the material on the table, to pull out a material web from a store arrange outside the forward edge of the table, when the suction hood moves to the second position, and wherein the fan means of the inverted hood is adapted to generate an excess pressure for supporting the material web on an air cushion when it is pulled out from the store and over the table.
Preferred embodiments of the invention are disclosed in the following sub-claims.
BRIEF DESCRIPTION OF DRAWINGS
The invention will now be described in detail in the following with the aid of an embodiment and with reference to the accompanying drawing, whereon
FIG. 1 is a schematical vertical section taken along the line I--I in FIG. 2, through equipment in accordance with the invention,
FIG. 2 is a view along the line II--II in FIG. 1,
FIG. 3 is a portion of a section taken along the line III--III in FIG. 1,
FIG. 4 is a section taken along the line IV--IV in FIG. 3,
FIG. 5 illustrates a detail of a material capturing means carried by the suction hood pertaining to the equipment,
FIG. 6 illustrates details in a fan means connected to the inverted hood pertaining to t
REFERENCES:
patent: 3234836 (1966-02-01), Buff
patent: 3304820 (1967-02-01), Muller et al.
patent: 3670612 (1972-06-01), Johnson et al.
patent: 3784183 (1974-01-01), Castro et al.
Albritton C. L.
Ingenjorsfirma G. Knutsson AB
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