Abrading – Machine – Combined
Patent
1995-11-03
1998-03-31
Eley, Timothy V.
Abrading
Machine
Combined
451130, 451150, 451167, B24B 728, B24B 2900
Patent
active
057331804
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The product concerns a run-thru sander for wood sanding and lacquer-intermediary sanding of panel covers etc., mainly plane workpieces. The surface of the workpiece is not necessarily plane (meaning smooth), but may include profiles and structurings or similar "relief formations". The sanding and polishing require, abrasives of the laminated type (e.g. the FLADDER type), with abrasive slats mounted next to each other in a rotating sanding head. The sanding heads sand the workpieces passing through the machine by the slats' "elastic" stroking of the workpiece surface. The necessary sanding pressure for the process arises from a combined effect of the centrifugal power during rotation of the sanding head, the natural rigidity of the slats and the effect of the stiff support brushes placed between the slats. The sanding is a result of the total effect of the slats.
BACKGROUND OF THE INVENTION
Various types of run-thru sanders of the mentioned type are known. They are based on slat sanding heads and sanding drums. Sanding drums positioned with their axis of rotation perpendicular to the direction of the feeding belt, process the workpiece surface during a sanding operation "lengthwise" and simultaneously across the full width of the workpiece. On panel covers with both lenghtwise and transverse profiles, only the lenghtwise profiles will be processed (sanded) in depth, since the sanding slats are not able or, only to a certain extent, capable of getting to the bottom ofthe transverse profiles, so they remain unprocessed. Attempts have been made to solve the problem by using a number of disk shaped sanding heads in sanding machines. One type of sanding head is shaped like a circular disc provided with sanding slats on the side. The sanding head, with the slats turned down towards the workpiece, rotates about its vertical axis. The slats rotate at the level of the workpiece, and will therefore partially rotate parallel to the transverse profiles of the workpiece. Theoretically a finished sanding of the surface of the workpiece would be expected also in the depth of the profiles, but it does not occur. The sanding result is far from satisfactory.
SUMMARY OF THE INVENTION
The purpose of this invention is to present a sander, which in a quite effective and well-defined way is able to perform a process of wood sanding and intermediate lacquer sanding of workpieces of the kind concerned. In this way subsequent finish-sanding, manually for example, will be rendered superfluous.
Apart from the mentioned transverse sanding drums the new sanding machine also consists of lengthwise positioned sanding drums in the machine in order to sand the workpiece in two perpendicular directions during one operation. The workpiece is sanded at two right angles to each other during one operation. The sanding drums are cylinder shaped with radial placed sanding slats. The transverse mounted sanding drums, i.e. with the axis of rotation laying in the direction of the machine, workpiece conveyance sand the workpiece transversely in relation to the workpiece conveyance direction, are arran- ged in a position to move cyclically from side to side in the machine during operation of the workpiece, so that the workpiece is sanded along its full width by the lengthwise positioned sanding drums as well.
The feeding belt speed, the cyclic variation frequency, and the number of revolutions of the sanding drums are individually adjusted, in consideration that the workpiece must be sanded as equally as possible on the entire surface in a finish pattern actually characterized as cross sanding.
Due to the cyclic variation from side to side by the sander, the lengthwise sanding drums (together with the traverse sanding drums) cause a complete and equal sanding of all points of the workpiece. The sanding drums sand the workpiece during their rotation with a relatively high number of revolutions, which makes the sanding slats effect the profiles of the workpiece when sanding "transversely". The profiles which extend transvers
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patent: 1669989 (1928-05-01), Madsen
patent: 1862277 (1932-06-01), Moon
patent: 4361986 (1982-12-01), van der Linden
patent: 5291689 (1994-03-01), Hundebol
patent: 5361544 (1994-11-01), Yang
Eley Timothy V.
S. F. Kilde A/S
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