Abrading – Precision device or process - or with condition responsive... – Computer controlled
Reexamination Certificate
1999-07-27
2001-09-18
Scherbel, David A. (Department: 3723)
Abrading
Precision device or process - or with condition responsive...
Computer controlled
C451S005000, C451S008000, C451S009000, C451S010000, C451S300000, C451S303000
Reexamination Certificate
active
06290570
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a belt grinding machine having a grinding belt continuously guided about deflection rollers, a pressure shoe for pressing the grinding belt against a workpiece via a contact pressure apparatus, and a contact pressure control whereby a contact pressure force can be set.
2. Description of Related Art
One such belt grinding machine is disclosed, for example, in EP 0 155 380 B1. That belt grinding machine has a segmented pressure beam having a large number of pressure shoes arranged side by side. Each pressure shoe can be controlled to be active or inactive through a detection device that detects the contour of the workpiece, so that only the pressure shoes that are actually needed for the workpiece are set into an active grinding position as the workpiece is conveyed through below the pressure beam by a conveyor device. The setting of the contact pressure force of the activated pressure shoes functions to press those pressure shoes, which have only a small area of contact with a marginal piece of the workpiece, against the workpiece with a reduced contact pressure force to prevent an undesirable rounded grinding of the edges of the workpiece. In this arrangement, the contact pressure force is preferably controlled by a solenoid, whose contact pressure force depends on the electrical power flowing through its coil windings. Other contact pressure devices, for example hydraulic or pneumatic pressure devices, may also be used.
The operation of this known device is as follows: the contour of the workpiece is detected; a contact pressure force is preset by the contact pressure control for the central region of the workpiece; and, in the case of solenoid actuation, the contact pressure control produces a predetermined current through the solenoid of the pressure shoe. A similar principle would apply if pneumatic or hydraulic drives were employed. Despite the sophistication of existing belt grinding machines, there is still room for improvement.
SUMMARY OF THE INVENTION
It is therefore a general object of the invention to provide a belt grinding apparatus that will alleviate or minimize problems occurring in the known alternatives.
A specific object of the invention is to provide a belt grinder with an optimal grinding result.
A preferred embodiment of the invention, which is intended to accomplish the above objectives, includes at least two deflection rollers; a grinding belt continuously guided about the deflection rollers; a pressure shoe that presses the grinding belt against a workpiece by a contact pressure apparatus; a contact pressure control whereby a contact pressure force can be set; a detector arrangement that senses the adjustment of the pressure shoe; and an evaluation device that adjusts the contact pressure control as a function of the sensed adjustment of the pressure shoe.
In addition to the above, the invention may include a plurality of pressure shoes and a conveyer for conveying the workpiece relative to the belt and the pressure shoes; a detection device that detects the contour of the workpiece, and a controller that activates and deactivates the pressure shoes in accordance with the detected contour of the workpiece.
REFERENCES:
patent: 4527359 (1985-07-01), Stump et al.
patent: 4601134 (1986-07-01), Hessemann
patent: 4839994 (1989-06-01), Hessemann
patent: 155 380 (1985-09-01), None
patent: 0 571 343 A1 (1993-11-01), None
patent: 571343 A1 (1993-11-01), None
patent: 5318305 (1993-03-01), None
Patent Abstracts of Japan, Sugitou Kasuke, 05318305, Dec. 3, 1993.
Foley & Lardner
McDonald Shantese
Scherbel David A.
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