Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1989-01-11
1990-11-06
Schmidt, Frederick R.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51141, 51170EB, B24B 2112
Patent
active
049675133
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a belt sanding machine especially for sanding wooden workpieces consisting of frame pieces around panelling, said panelling being recessed in relation to the frame pieces, and where the workpieces are carried forward on a conveyor belt below the belt sanding machine's lower turning roller for the sanding belt.
Machines of this type are particularly used within the furniture industry for sanding and polishing panelled doors and similar objects which are built of wooden frame pieces, with the grains of meeting frame pieces extending in different directions.
In order to avoid causing damage to the wood, it has to be sanded with the grains, and this means that a workpiece must be sanded in at least two different directions in order for the frame pieces to be sanded along the grain. Add to this that the sanding must be commenced and finished in the centre part of the workpiece in order to avoid damage to the frame pieces that extend transversely along the outer side.
Hitherto known machines for this purpose are extremely complicated and difficult to use, because they require a uniform product and a correspondingly precise conveyance below the sanding belt for each setting. Moreover, such machines are very expensive.
The machines are based on a sanding principle that comprises one or more thrust pads extending behind the sanding belt, which thrust pads can be actuated for pressing down the sanding belt towards the workpiece on a signal from an impulse transmitter. Similarly, the pressure against the sanding belt may be discontinued and the sanding stopped when the pressure of the thrust pad against the sanding belt is discontinued. An example of such a construction is described in German published specification No. 1,148,465.
This known construction thus comprises a separate sensing device which senses the item during its travelling below the sanding belt, and which produces a signal to a thrust pad which adjusts the position of the sanding belt in relation to the surface of the item. This is a complicated and poor solution, in that it cannot be avoided that considerable friction between the thrust pad and the sanding belt occurs when the sanding belt is pressed against the item. Add to this the complex construction of the sensory and adjustment equipment, and the use of signals which must be converted into adjustment signals for the pressure device.
It is the object of the invention to overcome these drawbacks of the known machines, and this is achieved by a machine wherein a lower sanding belt drum is provided with a mechanical sensing device follower which senses the the recessed panel while the drum is sanding along the grain of a frame piece and causes the sanding drum to be lifted up once the sensing device contacts an adjacent frame piece and is moved up from the recessed panel.
By an extremely simple and reliable method a sanding belt is hereby achieved where a lower drum of a belt sander is capable of adjusting itself to the shape of the workpiece merely by means of a sensing device which exerts a direct influence on the position of the drum in relation to the workpiece. Progamming, remote monitoring, thrust pads and connection means are hereby eliminated.
By designing the sensing device as a disc which can roll across the workpiece when the workpieces is conveyed below the sanding belt and which by its contact to the workpiece determines the position of the sanding belt, there is obtained a completely reliable and precise adjustment of the sanding process.
By mounting the disc directly on the axle of the lower turning roller, there is obtained a simple and strong construction.
By attaching the disc to an arm the sensing may be displaced in relation to the contact region of the sanding belt, and it becomes possible to sand items where the recess is displaced in relation to the required sanding point.
Finally it is expedient to be able to adjust the position of the disc in relation to the sanding belt in that it thereby becomes possible to adapt the machine to any required workpi
REFERENCES:
patent: 1841411 (1932-01-01), Kux
patent: 2192240 (1940-03-01), Richardson
patent: 3496679 (1970-02-01), Dunn
patent: 3516207 (1970-06-01), Baden
Frazier Mark F.
HH Patent ApS
Schmidt Frederick R.
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