Abrading – Machine – Endless band tool
Patent
1993-02-09
1994-11-08
Rose, Robert A.
Abrading
Machine
Endless band tool
451311, 451296, B24B 2120
Patent
active
053615468
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus arranged for grinding, polishing, etc. with a closed loop of grinding, polishing etc. belt mounted on the output shaft of a motor and driven by a rotating drive wheel, said loop belt or endless belt being intended to be applied against a workpiece which is to be machined by means of the loop belt, said closed loop having loop portions differing from one another in a running direction, the loop being steered by steering members to adopt an essentially L-shape and comprising at least two loop portions, of which the loop portion which is arranged to make contact with said workpieces is preferably selected shorter than the other loop portion.
Particularly in continuous processes for machining of materials into finished products, there is a requirement for the machines which perform the machining to demand little space in order for room to be made available for all machines. The same requirement for compactness also often applies to individual machines. The above requirement is often coupled to a demand that the machining, closed belt loop or endless belt shall be long in order to ensure a long service life and effective machining during long working sessions without any or with only a few changes during each working session. In prior-art technology, long belt loops have involved a demand for a large space in order to contain the belt loop, particularly in the horizontal plane, since machining is frequently to be carried out on surfaces which are both horizontal and vertical or in between, for instance on window mouldings of wood, which are usually produced in a continuous process.
Long, endless belts in themselves give rise to certain problems in profile polishing, for instance with stability in the transverse direction to the direction of rotation of the belt. Because of this, the risk is incurred that the belt loop can easily migrate to the side of the workpiece, resulting in disruption of production and a need for action on the part of the personnel.
DESCRIPTION OF THE PRIOR ART
One example of prior-art technology for solving the problem of stability in the transverse direction in a long, endless belt is evident from Swiss patent description No. 394 858, in which belt steering members 26a are utilized to steer the belt in the sideways direction. U.S. Pat. No. 2,751,724 shows a different prior-art technique for coping with belt control in the sideways direction, namely by diverting the belt loop at a right angle via an inclined, stationary surface 14. German Offenlegungsschrift No. DE 31 14615 describes a third prior-art technique, namely utilization of additional diverting rollers to arrange the machining belt loop in an L-shaped configuration and using a support surface 40 to steer the belt loop, the outer contour of said support surface being adapted to the wanted machining shape. None of these prior-art methods is capable of simply and quickly resetting the angle of approach to the workpiece of the machining loop.
In a continuous machining process resetting shall be able to be performed in order for the belt loop also to be able to machine the workpiece in an inclined direction, for example against a bevelled surface on a window moulding. In the continuous process, the workpiece is usually fed forwards on a given vertical level. From this it follows that it is highly desirable to be able to easily and quickly alter the angle of attack of the belt loop against a workpiece which is fed forwards in a given horizontal direction. It is likewise frequently desirable to be able to change the vertical level of attack of the belt loop against the workpiece in a simple, convenient and rapid manner.
SUMMARY OF THE INVENTION
The object of the present invention is to reduce to a large extent the need of space for a machining machine with a belt loop, viewed in a horizontal plane, while utilizing long belt loops for effective machining, and to take actions so that the risk of the belt loop migrating in the sidewa
REFERENCES:
patent: 825712 (1906-07-01), Evans et al.
patent: 2751724 (1956-06-01), Polzer
patent: 3024575 (1962-03-01), Dreiling
patent: 4669224 (1987-06-01), Armstrong et al.
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