EP0097992A1
Expired / Lapsed
EP
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Method and apparatus for contour cutting of plastic products
Assignee: Gebr Van Dijk Bv
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Filing: 1983-06-16
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Granted: —
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Expires: 2003-06-16
Abstract
Abstract Apparatus for contour cutting of a number of uniform plastic products from a block of starting material by means of a plurality of parallel filaments heated by an electric current, provided with a work table (3) that is movable in a horizontal direction for receiving at least part of a block of starting material, a supply conveyor (21) and a delivery conveyor (22), a number of vertical columns (2), a horizontal U-shaped framework that is mounted between two horizontal supporting beams (4), which framework is provided with a number of parallel cutting filaments and is movable up and down in a vertical direction along the columns (2), driving means (16) for the working table, driving means (11) for the supporting beams with the U-shaped frame, and means for imparting a synchronous oscillating movement of each of the filaments in the U-shaped frame in their long direction.
Inventors
- 👤 Hendricus Johannes Maria Van Dijk
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 02:14
CPC Classifications
B; B26; B26F; B26F3/00; B26F3/06; B26F3/08; B26F3/12; B26D; B26D1/00; B26D1/01; B26D1/547; B26D1/553
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A process for contour cutting of a number of uniform plastic products from a block of starting material, using a plurality of filaments disposed in parallel to one another and heated by an electric current, the starting material being given a movement in at least one direction, characterized in that the filaments are given an oscillating movement in their Ion direction for enhancement of the cutting effect, that the block of starting material is given a programmed reciprocating movement that is substantially parallel to the plane of the filaments, whilst a corresponding programmed reciprocating movement is imparted to the filaments substantiaaly at right angles to their plane of mounting.
Claim 2
Dependent Claim
109 words
A process for contour cutting of a number of uniform plastic products from a block of starting material, using a plurality of filaments disposed in parallel to one another and heated by an electric current, the starting material being given a movement in at least one direction, characterized in that the filaments are given an oscillating movement in their Ion direction for enhancement of the cutting effect, that the block of starting material is given a programmed reciprocating movement that is substantially parallel to the plane of the filaments, whilst a corresponding programmed reciprocating movement is imparted to the filaments substantiaaly at right angles to their plane of mounting.
Claim 3
Dependent Claim
148 words
Apparatus for the application of the process according to claim 1, provided with a work table that is movable substantially in a horizontal direction for receiving at least a part of a block of starting material, also provided with a drive mechanism for the work table operated according to a programme, a number of substantially vertical columns, a U-shaped framework movable up and down in a vertical direction along the vertical columns and disposed substantially in a horizontal plane, in which frame a number of filaments have been mounted in parallel to one another for cutting of the plastic material, a drive for moving the U-shaped framework in a vertical direction along the columns according to a certain programme corresponding with the programme for the horizontal displacement of the work table, and a drive for a synchronous oscillating movement of each of the filaments in their long direction.
Claim 4
Dependent Claim
100 words
Apparatus according to claim 2, characterized in that it is provided with four vertical columns disposed round the work table in a rectangle for supporting and guiding the U-shaped frame, each column being provided with a drive for the vertical displacement of the part of the frame supported by that column, whilst the drives of all four collumns are connected together for a synchronous drive, each column also having a counterweight fitted to it for virtually complete counterbalancing of that part of the weight of the U-shaped frame with components mounted on it which is borne by the appropriate column.
Claim 5
Dependent Claim
84 words
Apparatus according to either one of claims 2 and 3, characterized in that each filament is connected to a tension spring such that filament and tension spring are invariably stretched between two tension bars mounted in parallel to one another within the U-shaped frame, which tension bars can be moved synchronously to and fro in opposite directions for imparting a reciprocating movement to the filaments, whilst the tension spring fitted to successive filaments is preferably attached alternately to one tension bar and the other.
Claim 6
Dependent Claim
108 words
Apparatus according to claim 4, characterized in that the tension bars can be driven in opposite directions, because they have each been fitted on a rocker arm mounted on each of the two parallel bars of the U-shaped frame, both of these rocker arms being provided near the cross bar of the U-shaped frame with a pre-tensioning device and a lever, which lever is caused by the forces by the filaments with tension springs and the pre-tensioning device to rest against an eccentric, whilst the eccentric shafts on both sides of the U-shaped frame can be driven by means of a common driving motor and a toothed belt.
Claim 7
Dependent Claim
40 words
Apparatus according to any one of claims 2 to 5, characterized in that the work table is provided with a great number of grooves made in crosswise direction for receiving the filaments in the bottommost position of the U-shaped frame.
Claim 8
Dependent Claim
58 words
A product cut in at least two directions following a contour, manifestly made with use of the process according to claim 1 and/or by means of an apparatus according to any one of claims 2 to 6, such that the product's contours are substantially identical over its entire width and that the surface has a smooth, sealed structure.
References Cited (Backward Citations)
US3089526A
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FR1355283A
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BE754761A
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FR2261859A1
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EP0003167A1
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US4175455A
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EP0035852A2
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