Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1991-07-11
1992-12-01
Parker, Roscoe V.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51119, B24B 2303
Patent
active
051670950
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an eccentric grinding machine with an eccentric gearing between its drive and its grinding disc. Such a machine comprising a grinding disk is known from DE-OS 36 09 441 (U.S. Pat. No. 4,759,152). It carries two toothed rims of different dimensioning on its rear side, which toothed rims abrade with varying degrees of intensity at the machined workpiece with rotational movement of different speeds. However, it is difficult to determine when the machine is running whether or not the eccentric grinding machine is producing a coarse or a fine grinding.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an eccentric grinding machine which avoids the disadvantages of the prior art.
More particularly, it is an object of the present invention to provide such a grinding machine in which a grinding picture is displayed during operation when the grinding disc is rotating.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in that a grinding disc carries markings in form of characters or pictographs to designate a type of grinding movement, and the markings are arranged on a circular mark with a radius of a reference circle of a respective friction or toothed rim so as to be readable also while the grinding disc is rotating.
In accordance with an advantageous embodiment of the present invention, the markings are applied on an abrasive surface of the grinding disc. A particular advantage consists in the design of the friction or toothed rims by means of which the grinding disk is driven in such a way that cycloids having an integral number of nodes are formed on the grinding disk. During the rotation of the grinding disk this results in a stationary cycloid picture, so that a stationary symbol or a stationary character is visible when correspondingly marked. A stationary cycloid picture also results e.g. when the number of nodes is a half-integer, wherein the distances between the stationary nodes are reduced.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a view showing a partial cross-section of an eccentric grinding machine in accordance with the present invention;
FIG. 2 is a view showing a grinding disc of the inventive eccentric grinding machine; and
FIG. 3 is a view showing a grinding picture.
DESCRIPTION OF A PREFERRED EMBODIMENT
An eccentric grinding machine has a housing 3, a central eccentric gearing 4 and a rolling gearing 5, as described e.g. in DE-OS 36 09 441. A rolling gearing 5 is securely connected with the housing 3 in part. The eccentric gearing 4 has a connection piece 6 which is connected with a shaft of a drive motor, not shown. An eccentric sleeve 7 is connected eccentrically with the connection piece 6, and roller-supported supporting journal 8 is rotatably supported in the eccentric sleeve 7. A grinding disk 10 is securely connected with the supporting journal 8 by means of a screw 9. The grinding disk 10 is provided with an abrasive surface, particularly abrasive paper 11, on the side remote of the eccentric gearing 4. The abrasive paper 11 can be glued on or connected with the grinding disk 10 by means of a loop-and-hook connection. The grinding disk 10 carries two toothed rims 12 and 13 of different diameters on the side facing the eccentric gearing 4. The teeth of the toothed rims 12 and 13 face one another. A toothed ring 14 engages in one of the toothed rims 12, 13. The toothed ring 14 has an external toothing 15 and an internal toothing 16 which lie in two different planes in the axial d
REFERENCES:
patent: 3550324 (1970-12-01), Gerry
patent: 4754575 (1988-07-01), Schneider
patent: 4759152 (1988-07-01), Berger
Parker Roscoe V.
Robert & Bosch GmbH
Striker Michael J.
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