Abrading – Machine – Endless band tool
Reexamination Certificate
2000-03-23
2001-10-09
Eley, Timothy V. (Department: 3723)
Abrading
Machine
Endless band tool
C451S296000, C451S299000, C451S300000, C451S303000
Reexamination Certificate
active
06299517
ABSTRACT:
FIELD OF THE INVENTION
The invention concerns a band grinding machine, including a work piece support table with self-actuating work piece advancement and grinding assemblies following one another in the advancement direction of the work pieces and with different band movement directions.
BACKGROUND OF THE INVENTION
The grinding of wooden frames causes problems since the grain fiber directions of the longitudinal and transverse wooden parts of the frame are different, and it is desirable that the upper surface of a frame wooden part not be ground transversely to its fiber direction.
To avoid this disadvantage, band grinding machines are already known in which for a cross-grinding, a transverse band assembly and a broad band assembly are arranged behind one another in the advancement direction. The transverse band first grinds the top of the entire frame. The broad band assembly has two pressure shoes or pressure bars arranged parallel to the advancement direction which are adjustable transversely to the advancement direction so that the broad band can targetly be pressed against the longitudinal wooden parts of the frames to be ground. Therefore, the grinding tracks produced on the wooden longitudinal parts by the transverse band can be removed. A disadvantage of this solution is, however, that the grinding band of the broad band assembly is worn only locally.
In a further known cross-grind grinding machine, the broad band by means of an electronically controlled multiple member pressure bar is pushed downwardly in areas corresponding to the longitudinal wooden pieces. Also in this case, there arises the disadvantage that the broad band is only locally worn. Moreover, problems arise in the adjustment of the grinding width to the actual longitudinal wooden piece width, since the individual pressure elements of the pressure bar cannot be made as small as desired and, therefore, the danger exists that the longitudinal wood pieces are either not ground up to their longitudinal edges or that the longitudinal edges are ground round.
The invention has as its object the provision of a band grinding machine of the aforementioned kind which permits a desired grinding of the work piece parts parallel to their grain fiber directions with optimal utilization of the used grinding means.
BRIEF DESCRIPTION OF THE INVENTION
For the solution of the above object, a band grinding machine in accordance with the invention has a transverse band assembly with a grinding band running transversely to the work piece advance direction, which band extends over the entire width of the work piece support table, and, following the transverse band assembly in the advance direction, at least two longitudinal band assemblies the grinding band of each of which runs parallel to the work piece advance direction and has a width which is small in comparison to the width of the work piece support table, with the position of at least one of the longitudinal band assemblies being adjustable transversely to the work piece advance direction.
In the grinding of frames with a band grinding machine of the invention, as previously the entire frame is preferably first ground over its top with the transverse band. Subsequently, with the help of the longitudinal band assemblies, only the longitudinal wood pieces are ground. The longitudinal band assemblies can, for this purpose, be adjusted exactly to the positions of the longitudinal wood pieces. There exists also the possibility that the frames, for example, on one of their sides run along a stop and that the longitudinal band assembly associated with the longitudinal wood piece near the stop is stationary, with only the one longitudinal band assembly associated with the other longitudinal wood piece being adjustable.
Since the grinding bands of the longitudinal band assemblies have a width suited to the width of the longitudinal wood pieces to be ground, the supplied grinding means is optimally utilized, which in view of the substantial costs for grinding bands represents a substantial cost advantage. Moreover, the area in which each of the longitudinal grinding bands is effective on the longitudinal wooden pieces can be more exactly adjusted than with a wide band with help of its multiple-part pressure bar in its unchangeable position.
The grinding results can be further optimized if each of the longitudinal band assemblies has a segmented grinding bar whose segments are individually controllable. Thereby, a bend and unevenness of the work piece can also be smoothed out.
REFERENCES:
patent: 3408775 (1968-11-01), Rutt
patent: 4839994 (1989-06-01), Heesemann
patent: 6001004 (1999-12-01), Bottehi
Eley Timothy V.
McCormick Paulding & Huber LLP
McDonald Shantese
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