Cutlery – Cutting tools – With blade moving means
Patent
1983-10-27
1985-12-10
Peters, Jimmy C.
Cutlery
Cutting tools
With blade moving means
83 71, 83925CC, B26D 510, A41H 4300
Patent
active
045570515
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a machine for cutting out flat material, in particular a fabric cutting machine, comprising a table for bearing the flat material, a supporting structure movable along the bearing table and supporting a cutting tool, in particular a cutter blade mechanism, rotatable about an axis extending perpendicular to the bearing surface of the table, and having an associated cutting tool drive, and comprising drive means consisting of a longitudinal drive for displacing the supporting structure along the table as well as at least one additional, controllable drive associated with the supporting structure for controlling movement of the cutting tool relative to the bearing surface of the table in a direction of cutting predetermined by the orientation of a cutting edge of the cutting tool.
The invention deals in particular with a cutting machine comprising a bridge displaceable by the longitudinal drive and spanning the bearing table in a transverse direction and also comprising a cross slide which is mounted on the bridge, displaceable relative to the bridge by a cross drive and supports the cutting tool, the bridge normally being supported at both ends relative to the cutting table but can, if necessary, be supported only on one side in order to span the cutting table in the form of a supporting arm.
A cutting machine of this type is known, for example, from CH-PS No. 406 103 and operates as an automatic cutting machine, with which the data for the sample to be cut out are either stored beforehand or obtained during operation by scanning a paper pattern, which can, if necessary, be placed directly beneath the material web and will be scanned by suitable scanning elements which detect the line of the paper pattern to be followed at a point slightly in front of the cutting edge.
Apart from these automatic machines, manually operated cutting machines are also known, with which the cutting tool is suspended from a support means which is displaceable by means of a frame or a bridge in the longitudinal direction of the cutting table. For example, German Utility Model G No. 81 08 075.1 describes a cutting machine, with which the cutting tool is suspended from a supporting arm held in a rotatable mounting for sliding displacement, the mounting itself being secured to a spider-like carriage with three supports, which may be moved by hand along the cutting table. Furthermore, DE-OS No. 27 03 066 describes a cutting machine, in particular a material cutting machine, comprising a carriage displaceable in the longitudinal direction of the bearing table, a beam being pivoted on this carriage and having at least two arms which are interconnected by a joint having a vertical joint axis, the cutting device being mounted at the free end of the outer arm such that it is rotatable about a vertical axis.
A disadvantage of the known cutting machines, with which the cutting device, in particular a cutter blade, is moved by hand through the material to be cut, is the fact that considerable force is required on the part of the operating personnel and at least some parts of the support means must also be moved by the operating personnel--in individual cases a motor-operated longitudinal drive is provided so that the support means can follow the cutter blade section by section by actuating the drive means. This leads, on the one hand, to the operating personnel becoming tired rather quickly and, on the other hand, to inaccurate cutting since the force required will naturally impair the sensitivity of movement necessary to guide the cutting tool.
Proceeding on the basis of this prior art the object underlying the invention is to improve a cutting machine of the type described at the beginning such that the work of the operating personnel is made easier and greater cutting accuracy is achieved.
This object is accomplished according to the invention in that a first angular position detector is associated with the cutting tool, that with the aid of said first angular position detector directional control signals correspon
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Krauss u. Reichert GmbH & Co. KG
Peters Jimmy C.
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